Iranian Chemical Society
Inorganic Chemistry Research
2538-1865
5
1
2021
07
01
Bimetallic MOFs as Catalysts for Efficient and Totally Selective Oxidation of Benzylic Alcohols at Ambient Conditions
1
9
EN
Alireza
Farrokhi
0000-0003-2015-7841
Department of Chemistry, Faculty of Science, University of Birjand, Birjand, 97179-414 Iran
afarrokhi@birjand.ac.ir
Maryam
Asaadzadeh
Department of Chemistry, Faculty of Science, University of Birjand, Birjand, 97179-414 Iran
maryamasadzadeh375@gmail.com
Fahimeh
Feizpour
Department of Chemistry, Faculty of Science, University of Birjand, Birjand, 97179-414 Iran
f_feizpour@birjand.ac.ir
10.22036/icr.2020.245801.1084
The catalytic activity of bimetallic MOFs known as STA-12(M1, M2)(M1,2= Mn, Fe, Co) was investigated in the oxidation of benzylic alcohols to corresponding aldehydes at ambient conditions. The oxidation reaction with Na2S2O4/TBHP (tert-Butyl hydroperoxide) mixture shows total selectivity and excellent efficiency under desired reaction times. The heterogeneous catalyst displays high reusability and stability for the ten consecutive reactions without decreasing in yield and selectivity. To identify radical species responsible for the oxidation process, selective radical scavenging experiments were performed and a purposed oxidation mechanism was discussed.
Heterogeneous catalysis,Bimetallic MOFs,Alcohol oxidation,STA-12
https://www.inorgchemres.org/article_120398.html
https://www.inorgchemres.org/article_120398_16354805da0b4f6bdf8ad9fcc3b84bfc.pdf
Iranian Chemical Society
Inorganic Chemistry Research
2538-1865
5
1
2021
07
01
1D Copper(I) Coordination Polymer [Cu2(μ-L)(μ-I)2]n : Synthesis, Crystal Structure, Spectral and Thermal Study
10
18
EN
Vahid
Mirdarvatan
0000-0003-4188-5645
Department of Chemistry, Shahrood University of Technology, Shahrood, Iran
vmirdarvatan@yahoo.com
Bahram
Bahramian
0000-0002-0665-2697
Department of Chemistry, Shahrood University of Technology, Shahrood, Iran
bahramian_bahram@yahoo.com
Aliakbar
Dehno Khalaji
Department of Chemistry, Faculty of Science, Golestan University, Gorgan, Iran
alidkhalaji@yahoo.com
Seyyed Javad
Peyghoun
Department of Chemistry, Payame Noor University, Mashhad, Iran
sj.peyghoun@yahoo.com
Michal
Dusek
Institute of Physic of the Czech Academy of Sciences, Na Slovance 2, 182 21 Prague, Czech Republic
dusek@fzu.cz
Vaclav
Eigner
Institute of Physic of the Czech Academy of Sciences, Na Slovance 2, 182 21 Prague, Czech Republic
eigner@fzu.cz
10.22036/icr.2020.252783.1092
A new 1D copper(I) coordination polymer [Cu<sub>2</sub>(μ-L)(μ-I)<sub>2</sub>]<sub>n</sub> (1), where L is N,N'-bis(4-nitrobenzylidene)butane-1,4-diamine, was synthesized and characterized by CHN, FT-IR, 1H NMR, and single-crystal X-ray analyses. Based on X-ray results, this new compound crystallizes in a monoclinic system with space group P21/c. The asymmetric unit consists of one copper and one iodine atoms and half of the Schiff base ligand (L). The flexible Schiff base compound is coordinated to copper(I) ion as a bis-monodentate ligand. The coordination geometry around the copper(I) ions is distorted trigonal planar. The thermal behavior of 1 was studied using thermogravimetry analysis. Moreover, the nanoparticles of 1 were prepared via the ultrasonic-assisted method and characterized by XRD and SEM analyses.
1D copper(I) coordination polymer,Thermogravimetry,crystal structure,Nanoparticles,Ultrasonic bath
https://www.inorgchemres.org/article_121012.html
https://www.inorgchemres.org/article_121012_e62ffb57fb2a09db218eeb02eb52978f.pdf
Iranian Chemical Society
Inorganic Chemistry Research
2538-1865
5
1
2021
07
01
Modification of Magnetic TiO2 Nanocomposite with CoIII, ZnII and NiII Porphyrins for Photodegradation of Methylene Blue under the Blue Vis-LED Light Irradiation
19
36
EN
Ensieh
Gholamrezapor
0000-0002-9246-5360
Department of Inorganic Chemistry, Faculty of Chemistry, University of Mazandaran, P. O. Box: 47416-95447, Babolsar, Iran
ens12gh@gmail.com
Abbas
Eslami
0000-0003-1196-5441
Department of Inorganic Chemistry, Faculty of Chemistry, University of Mazandaran, P. O. Box: 47416-95447, Babolsar, Iran
eslami@umz.ac.ir
10.22036/icr.2020.235835.1073
The magnetic nanocomposites [magnetite@silica@titania@metallo tetra hydroxyl phenyl porphyrin, Fe3O4@SiO2@TiO2@MTHPP] (MSiTMP; M = CoIII, ZnII, NiII) and [Fe3O4@SiO2@TiO2] (MSiT) have been synthesized and characterized. These nanocomposites were used to degrade of methylene blue (MB) under the blue light-emitting diode (LED) lamp irradiation. The degradation of MB was monitored by UV-Vis spectrometry. Upon a 180 min irradiation period maximum degradation of MB in presence of MSiTNiIIP, MSiTZnIIP, MSiTCoIIIP and MSiT photocatalysts were 90, 80, 63, and 48 %g−1, respectively. After three 180 min runs, the photocatalysts still exhibited good activity. From Ultra-Violent-Diffuse reflectance spectroscopy spectra, the band gap energies of the photocatalysts were found to be 2.6, 2.5, 2.4 and 2.2 eV for MSiT, MSiTCoIIIP, MSiTZnIIP and MSiTNiIIP, respectively. The results consist with the observed relative photocatalytic activity of the photocatalysts which is as follows: MSiTNiIIP> MSiTZnIIP >MSiTCoIIIP >MSiT. The higher photocatalytic properties of MSiTNiIIP photocatalyst may be due to the fact that NiII complex is more susceptible to receive electron and reach to steady state than that of ZnII and CoIII. The degradation of MB using these nanocomposites were found to follow the pseudo first order kinetics.
Methylene blue,Metalloporphyrin,Magnetic nanoparticles,Titanium,LED
https://www.inorgchemres.org/article_121508.html
https://www.inorgchemres.org/article_121508_75501f495e3ff9292bbc82c8001e6faf.pdf
Iranian Chemical Society
Inorganic Chemistry Research
2538-1865
5
1
2021
07
01
Sol-gel Synthesis of Selenium-doped Nickel Oxide Nanoparticles and Evaluation of their Cytotoxic and Photocatalytic Properties
37
49
EN
Samaneh
Ghazal
Chemistry Department, Payame Noor University, 19395-4697 Tehran, Iran
ghazal.saman.70@gmail.com
Alireza
Akbari
Chemistry Department, Payame Noor University, 19395-4697 Tehran, Iran
a_akbari@pnu.ac.ir
Hasan Ali
Hosseini
Chemistry Department, Payame Noor University, 19395-4697 Tehran, Iran
shahosseini57@pnu.ac.ir
Zahra
Sabouri
Neurogenic Inflammation Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
zahra_sabouri68@yahoo.com
Mehrdad
Khatami
Noncommunicable Diseases Research Center, Bam University of Medical Sciences, Bam, Iran
mehrdad7khatami@gmail.com
Majid
Darroudi
Nuclear Medicine Research Center, Mashhad University of Medical Sciences, Mashhad, Iran. Department of Medical Biotechnology and Nanotechnology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
majiddarroudi@gmail.com
10.22036/icr.2020.258236.1094
In this paper, we examined the morphology, shape and magnetic and electronic properties of Selenium-doped nickel oxide nanoparticles (Se-doped NiO-NPs), which were achieved through a sol-gel technique that involved the usage of Cydonia oblonga plant extract. The structural and magnetic properties of Se-doped NiO-NPs were evaluated by the employment of XRD, FESEM / EDAX, FT-IR, UV-Vis, and VSM procedures. According to XRD studies, the nanoparticles accommodated a face-centered cubic (fcc) crystalline structure and a space group of (Fm3m). In addition, the size of nanoparticles in optimal conditions (the optimum temperature of 400 °C and 3% Se-doped) were reported to be 7.7 nm while a direct relationship was also observed with increasing the concentration of selenium. The FESEM images confirmed the spherical morphology of Se-doped NiO-NPs. Also, the photocatalytic properties of Se-doped NiO-NPs were evaluated through the usage of methylene blue (MB) pigment degradation under UV light. The outcomes of this evaluation exhibited more than 76 % of degrading within 200 min. To complete the project, the cytotoxicity aspect was also investigated on L929 cell lines, requiring the application of MTT assay, while the results were indicative of toxicity effects that can be used for inhibiting cancer cells.
Se-doped NiO nanoparticles,Biosynthesis,Cydonia oblonga extract,Photocatalytic,Cytotoxicity
https://www.inorgchemres.org/article_121692.html
https://www.inorgchemres.org/article_121692_e7c8d9f1f3be0718187a18c8c4c81382.pdf
Iranian Chemical Society
Inorganic Chemistry Research
2538-1865
5
1
2021
07
01
The Effect of Synthetic Procedures on Formation of Two Silver Coordination Polymers and their Antibacterial Activities
50
59
EN
Mahnoosh Zamani
Isfahani
School of Chemistry, College of Science, University of Tehran, Tehran, Iran
mahnooshzamani@yahoo.com
Kamran
Akhbari
School of Chemistry, College of Science, University of Tehran, Tehran, Iran
kmrn.akhbari@gmail.com
Anukorn
Phuruangrat
Department of Materials Science and Technology, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, Thailand
anukorn.p@psu.ac.th
10.22036/icr.2021.248806.1087
The effect of synthesis procedure on formation of [Ag2(μ2-py-4-c)2]n (1) and {[Ag(py-4-c)(Hpy-4-c)]1/2.[Ag(py-4-c)]}n (2) coordination polymers (py-4-c = pyridine-4-carboxylate) were studied. Pyridine-4-carboxylic acid (Hpy-4-c) was deprotonated by KOH and the anionic ligand was become available for interaction with the metal ion. AgNO3 was added to the ligand solution with two different rates in two conditions of bulk and ultrasonic bath which yielded to [Ag2(μ2-py-4-c)2]n (1) on stirrer and a different coordination polymer in ultrasonic bath, {[Ag(py-4-c)(Hpy-4-c)]1/2.[Ag(py-4-c)]}n (2). Formation of [Ag2(μ2-py-4-c)2]n (1) and {[Ag(py-4-c)(Hpy-4-c)]1/2.[Ag(py-4-c)]}n (2) were investigated with different analyses such as Powder X-ray Diffraction (PXRD), Fourier-Transform Infrared spectroscopy (FT-IR), Scanning Electron Microscopy (SEM) and Thermogravimetric analysis (TGA). Moreover, antibacterial activity of the samples was investigated against both gram-negative (E. coli) and gram-positive (S. aureus) bacteria’s.
antibacterial,Coordination polymer,Nanostructure,Silver,Sonochemical
https://www.inorgchemres.org/article_122437.html
https://www.inorgchemres.org/article_122437_f3446db5dc64d165fbb5873919e0b66e.pdf
Iranian Chemical Society
Inorganic Chemistry Research
2538-1865
5
1
2021
07
01
Efficient Photocatalytic Degradation of Methyl Orange and Methylene Blue under Visible Light Irradiation and Sunlight by TiO2 Nanoparticles Using Novel Tridentate N2O Schiff Base Complexes
60
81
EN
Ali Hossein
Kianfar
Department of Chemistry, Isfahan University of Technology, Isfahan, Iran, 84156-83111
akianfar@cc.iut.ac.ir
Parisa
Montazeri Najafabadi
Department of Chemistry, Isfahan University of Technology, Isfahan, Iran, 84156-83111
khkianfar@gmail.com
Maryam
Sedighipoor
Department of Chemistry, Isfahan University of Technology, Isfahan, Iran, 84156-83111
ms.sedighipoor@gmial.com
Mohammad Mohsen
Momeni
Department of Chemistry, Isfahan University of Technology, Isfahan, Iran, 84156-83111
mm.momeni@iut.ac.ir
Helmar
Görls
Institute of Inorganic and Analytical Chemistry, Chair of Inorganic Chemistry II, Friedrich Schiller University Jena, Humboldtstr. 8, 07743 Jena, Germany
helmar.goerls@uni-jena.de
Winfried
Plass
Institute of Inorganic and Analytical Chemistry, Chair of Inorganic Chemistry II, Friedrich Schiller University Jena, Humboldtstr. 8, 07743 Jena, Germany
sekr.plass@uni-jena.de
Gholamhossein
Mohammadnezhad
0000-0003-1765-8063
Department of Chemistry, Isfahan University of Technology, Isfahan, Iran, 84156-83111
mohammadnezhad@iut.ac.ir
10.22036/icr.2021.251863.1090
Two novel heterocyclic Schiff base complexes ([VOL<sup>1</sup>(DMF)] [H<sub>2</sub>L<sup>1</sup> = (E)-1-((2-amino-5-nitrophenyl)imino-methyl) naphthalen-2-ol] and [VO<sub>2</sub>L<sup>2</sup>] [H<sub>2</sub>L<sup>2</sup> = [(E)-1-((2-aminoethyl) imino-methyl)naphthalen-2-ol]) were synthesized and FT-IR, elemental analysis and UV-Vis spectroscopy were used to fully characterize them. Single-crystal X-ray diffraction was used to determine the structure of the [VO<sub>2</sub>L<sup>2</sup>] complex, in which the coordination around the vanadium ion is best described as distorted square pyramidal. The basal plane is formed by the donor atoms (NNO) of the Schiff base ligand and one of the oxo groups while the apical position is occupied by the other oxo group in the structure. The Schiff base complexes were loaded over TiO<sub>2</sub> photocatalyst and calcined at 450°C. The MOX/TiO<sub>2</sub> structure and morphology were characterized by FT-IR, scanning electron microscopy (SEM), X-ray diffraction (XRD), EDX and solid state UV-Vis absorption. Photocatalytic oxidation of methyl orange (MO) and methylene blue (MB) dyes in aqueous media by solar and visible lights was used to evaluate the photocatalytic efficiency of MOX/TiO<sub>2</sub> semi-conducting nanoparticles. The incorporation of these complexes enhanced TiO<sub>2</sub> activation with visible light compared with naked TiO<sub>2</sub>, according to the results.
Schiff base,X-ray diffraction,Photocatalytic efficiency,Methylene blue,Methyl Orange
https://www.inorgchemres.org/article_122647.html
https://www.inorgchemres.org/article_122647_4a36b4224d18018c836c1ac714d7b8ff.pdf
Iranian Chemical Society
Inorganic Chemistry Research
2538-1865
5
1
2021
07
01
Palladium Supported on Schiff Base Functionalized Magnetite Nanoparticles as an Efficient Catalyst for Coupling Reactions
82
93
EN
Masomeh
Balali
Hamedan University of Technology, 65155 Hamedan, Iran
masomeh.balali@yahoo.com
Mojtaba
Bagherzadeh
Chemistry Department, Sharif University of Technology, P. O. Box: 11155-3615, Tehran, Iran
bagherzadeh@sharif.edu
Razieh
Nejat
Faculty of Science, Department of Chemistry, Kosar University of Bojnord, Iran
sahba_r_nejat@yahoo.com
Hassan
Keypour
Faculty of Chemistry, Bu-Ali Sina University, Hamedan 65174, Iran
haskey1@yahoo.com
10.22036/icr.2021.246772.1086
Palladium has been supported on 2-((3-(piperazin-1-yl) propylimino)methyl)phenol functionalized magnetite nanoparticles (denoted as Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>@L-Pd(II)). The supported Pd was used as an active heterogeneous catalyst in Suzuki cross-coupling reaction under solvent-free conditions. This nanocatalyst could be facilely separated via magnetic concentration and the isolated catalyst exhibited long-term stability. Easy work-up, high yield, recycling of the catalyst, low reaction times, non-toxicity of catalyst and and solvent-free conditions as an environmentally benign procedure are the main merits of this protocol.The produced catalyst were characterized by XRD, FT-IR, XPS, SEM, TEM, EDAX, VSM, TGA and ICP-OES.
Palladium catalyst,Suzuki reaction,Magnetic separation,Solvent-free conditions
https://www.inorgchemres.org/article_123021.html
https://www.inorgchemres.org/article_123021_09dafda3c018ce3bf40a5c1123196e8f.pdf
Iranian Chemical Society
Inorganic Chemistry Research
2538-1865
5
1
2021
07
01
Theoretical Investigation of 4-Methyl-4H-1,2,4-triazole-3-thiol and Its Mononuclear and Dinuclear Palladium(II) Complexes; Molecular Structure, NBO Analysis, FT-IR and UV-Vis Spectroscopy
94
111
EN
Sara
Seyfi
School of Chemistry, Damghan University, P.O. Box 36715-364 Damghan, Iran
sara.seyfi91@yahoo.com
Robabeh
Alizadeh
School of Chemistry, Damghan University, P.O. Box 36715-364 Damghan, Iran
robabeh_alizadeh@yahoo.com
Masoud
Darvish Ganji
Department of Chemistry, Islamic Azad University, Qaemshahr, Iran
ganji_md@yahoo.com
Vahid
Amani
0000-0003-3802-027X
Department of Chemistry, Farhangian University, Tehran, Iran
v.amani@cfu.ac.ir
10.22036/icr.2021.238089.1076
In this research, the characterization of complexes [Pd(aemptrz)Cl<sub>2</sub>] (1), [Pd<sub>2</sub>(μ-mptrz)<sub>2</sub>(mptrz)<sub>2</sub>(en)].CH<sub>3</sub>OH (2) [Pd<sub>2</sub>(μ-mptrz)<sub>4</sub>] (3) and [Pd<sub>2</sub>(μ-mptrz)<sub>2</sub>(mptrz)<sub>2</sub>(en)] (4) (where aemptrz is 1‐(1‐(λ<sup>2</sup>‐azanyl)ethyl)‐4‐methyl‐5‐(λ<sup>1</sup>‐sulfanyl)‐4H‐1λ<sup>4</sup>,2,4‐triazole, en is ethylene diamine and Hmptrz is 4-methyl-4H-1,2,4-triazole-3-thiol) were carried out by Density Functional Theory (DFT) calculations. Structural, electronics and molecular properties (such as bond distances, bond angles, energies of highest occupied molecular orbital (EHOMO), the lowest unoccupied molecular orbital (ELUMO), the energy gap (ΔE), chemical hardness η, the dipole moment μ and Natural bond orbital (NBO) analysis of compounds) have been investigated using B3LYP/TZVP level of theory. Moreover, electronic structures of all complexes via NBO calculation show that Pd-N and Pd-S bonds are made of delocalization of occupancies from lone pair (LP) orbital of N, S atoms to the palladium atom. The FT-IR spectroscopy analysis and electronic spectra were calculated using B3LYP/TZVP basis set and compared with the experimental values. Furthermore calculation of vibrational spectra are also allocated based on the potential energy distribution (PED) using the VEDA 4 program. The electronic spectra were calculated using DFT and time dependent density functional theory (TD-DFT) methods.
4-Methyl-4H-1,2,4-triazole-3-thiol,Palladium(II) complexes,Energy gap,Chemical hardness η,Dipole moment μ,Density functional theory (DFT),Potential energy distribution (PED),TD-DFT
https://www.inorgchemres.org/article_123031.html
https://www.inorgchemres.org/article_123031_40e9c83e7bb35fbfcdd96d71e01e4e16.pdf
Iranian Chemical Society
Inorganic Chemistry Research
2538-1865
5
1
2021
07
01
Catalytic Properties of Ag@Zn-MOF Nanocomposites for Dehydrogenation of Ammonia Borane
112
119
EN
Reza
Sacourbaravi
Department of Chemistry, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran
reza.baravi@gmail.com
Zeinab
Ansari-Asl
Department of Chemistry, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran
z.ansari@scu.ac.ir
Mohammad
Kooti
Department of Chemistry, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran
m.kooti@scu.ac.ir
Valiollah
Nobakht
Department of Chemistry, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran
v.nobakht@scu.ac.ir
10.22036/icr.2021.262552.1099
The utilization of NH<sub>3</sub>BH<sub>3</sub> (ammonium borane) as a H<sub>2</sub> gas storage compound is restricted by its slow rate for H2 evolution. In this study, three Ag@Zn-MOF nanocomposites with different amounts of Ag:Zn-MOF ratio of 0.25:1 (1), 0.5:1 (2), and 1:1 (3) were investigated as catalysts for hydrogen evolution from hydrolysis of NH<sub>3</sub>BH<sub>3</sub>. Well dispersed encapsulated Ag nanoparticles (30-60 nm) in the matrix of the composites have been prepared in the presence of Zn(II) metal-organic frameworks (Zn-MOFs) in an aqueous solution by using NaBH<sub>4</sub> as a reducing agent at room temperature. These nanocomposites have shown good catalytic activity for the hydrolysis of NH<sub>3</sub>BH<sub>3</sub>.
Hydrogen generation,Ammonia borane,Metal-organic framework,nanocatalyst
https://www.inorgchemres.org/article_125669.html
https://www.inorgchemres.org/article_125669_ef9902ad9dabbbc9e836b13201079bdb.pdf
Iranian Chemical Society
Inorganic Chemistry Research
2538-1865
5
1
2021
07
01
A DFT Study of Selenium-Cyclic Peptide Anticancer Nanocarrier
120
131
EN
Sara
Moghimi
Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran
sara.moghimi68@yahoo.com
Ali
Morsali
0000-0002-8569-2442
Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran
almorsali@yahoo.com
Mohammad
Momen
Heravi
Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran
drmh45@yahoo.com
S. Ali
Beyramabadi
Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran
abeyramabadi@gmail.com
10.22036/icr.2021.266085.1100
Using Se8 selenium and cyclic peptides and nanoparticles (SeCPNP), six configurations for the adsorption of the 5-fluorouracil (FU) anticancer drug on SeCPNP have been examined (SeCPNP/FU1-6). Binding energies, solvation energies and quantum molecular descriptors such as electrophilicity (ω) and global hardness (η) in the aqueous solution and gas phase were studied at the density functional level of M06-2X. The most stable structure by binding energy calculations was determined. The values obtained from solvation energies indicate that SeCPNPs can increase the solubility of FU, which is a key factor in drug delivery. According to quantum molecular descriptors, the reactivity of cyclic peptide (CP) and FU drug in all structures (SeCPNP / FU 1-6) increases. AIM calculations for all structures show that Se-A interactions (A = O, H, N, F, C) and intermolecular hydrogen bonding play an important role for this drug delivery system. In structures where FU is parallel to SeCPNP and undergoes interactions concurrently with Se8 and CP, it is more stable than structures in which the drug undergoes interactions only with Se8 and CP.
5-fluorouracil,Anticancer,AIM analysis,DFT,Selenium cyclic peptide nanoparticles
https://www.inorgchemres.org/article_126101.html
https://www.inorgchemres.org/article_126101_68475c1154efde3d432eb72d83a5df65.pdf
Iranian Chemical Society
Inorganic Chemistry Research
2538-1865
5
1
2021
07
01
Synthesis, Characterization, Antioxidant Studies and Scavenger Effect of Quercetin and its Copper(II) Complexes on Hydrogen Peroxide-induced Luminol Chemiluminescence
132
148
EN
Zahra
Mohseni Afshar
Department of Inorganic Chemistry, University of Mazandaran, Babolsar, Iran
zmac1366@yahoo.com
Omeleila
Nazari
Department of Inorganic Chemistry, University of Mazandaran, Babolsar, Iran
o.nazari@umz.ac.ir
Mohammad
Javad
Chaichi
Department of Inorganic Chemistry, University of Mazandaran, Babolsar, Iran
jchaichi@yahoo.com
10.22036/icr.2021.257885.1095
Two copper (II) complexes of Quercetin (Q) with metal:ligand stoichiometry ratios of 1:1 and 1:2 were synthesized. The synthesized complexes structures were determined by UV-Vis spectroscopy, Infra-red spectroscopy, thermogravimetry, elemental analyses as well as cyclic voltammetry. The spectroscopic data suggest that the chelation between Q and Copper (II) can occur through a 3-hydroxy-4-carbonyl site. The antioxidant effectiveness and scavenging activity of quercetin and its complexes were evaluated using DPPH method and luminol-hydrogen peroxide chemiluminescence system. The results showed that prepared compounds have strong quenching effects on the chemiluminescence intensity of luminol in the alkaline medium and are efficient in scavenging free radicals produced in this system. Reaction system variables such as luminol, quercetin and their complexes' concentration and various pH of luminol solution were investigated. Stren-Volmer equation was also used to study the kinetics of the luminol reaction system and linear relationship was obtained between CL intensity and the concentration of these compounds in a range of 10-100 mg/L. The Stern–Volmer quenching constant, Kq value in the presence of free quercetin is higher than the complexes, which indicates the fact that complexation with metal ions changes the chemical properties of quercetin and decreases the inhibitory ability and radical scavenging efficiency. The concentration-dependent inhibitory ability of quercetin and copper complexes is attributable to the presence of several hydroxyl groups in their structure that react with superoxide or peroxyl radicals available in luminol-H2O2 system. Our study strongly confirmed the potent radical scavenging property of polyphenolic compounds and their metal complexes.
Quercetin,Copper(II) complex,antioxidants,Luminol chemiluminescence,Stern-Volmer plot
https://www.inorgchemres.org/article_127551.html
https://www.inorgchemres.org/article_127551_624ed60c557c26324004a1ff7d8a45a3.pdf
Iranian Chemical Society
Inorganic Chemistry Research
2538-1865
5
1
2021
07
01
Conversion of Levulinic Acid to n-Butyl Levulinate over Mesoporous Zirconium Phosphate Catalysts
149
162
EN
Fatemeh
Jamali
Department of Chemistry, Isfahan University of Technology, 84154-83111 Isfahan, Iran
tabestan93z@gmail.com
Alireza
Najafi Chermahini
Department of Chemistry, Isfahan University of Technology, 84154-83111 Isfahan, Iran
anajafi@iut.ac.ir
Neda
Ayashi
Department of Chemistry, Isfahan University of Technology, 84154-83111 Isfahan, Iran
n.aiashy@yahoo.com
10.22036/icr.2021.259897.1097
In this study, mesoporous zirconium phosphates (m-ZrPs) with a different molar ratio of phosphate to zirconium were synthesized and used as the heterogeneous catalyst for the production of n-butyl levulinate from levulinic acid. The catalysts were characterized using various techniques such as N2 adsorption-desorption, XRD, FT-IR, ICP-OES, SEM, and TEM. The prepared catalysts were confirmed to possess the mesoporous structure with a high surface area. Among the synthesized catalysts, m-ZrP-2 showed the best performance in the conversion of levulinic acid to n-butyl levulinate. The reaction conditions were optimized on parameters such as reaction time, temperature, amount of catalyst, and the molar ratio of LA to n-butanol. Temperature 120 °C, reaction time 7 hours, the ratio of acid to alcohol 1:9, and 0.01g catalyst were selected as the optimum conditions. In addition, the selected m-ZrP-2 catalyst was successfully recycled for six consecutive cycles without significant loss in its activity.
Levulinic acid,Butyl levulinate,Mesoporous zirconium phosphate,Esterification,Biomass conversion
https://www.inorgchemres.org/article_128055.html
https://www.inorgchemres.org/article_128055_0c03ab932863ba40810ae03f9cd6a5d3.pdf