Iranian Chemical SocietyInorganic Chemistry Research2538-18656120220701Fast and Efficient Epoxidation of Olefins Catalyzed by Brominated Mn(III) Salophen Grafted onto CoFe2O3/Graphene Oxide as a Heterogeneous Catalyst1914239910.22036/icr.2021.312540.1120ENRobabeh -HajianDepartment of Chemistry, Yazd University, Yazd 89195-741, Iran0000-0002-4637-357XJournal Article20211104This study aims to prepare di-brominated Mn(III) Salophen, [MnSalBr], grafted onto CoFe<sub>2</sub>O<sub>3</sub>/graphene oxide (CFGO) via a covalent bond. The<strong> </strong>characterization of this heterogeneous catalyst (CFeGO@MnSalBr) was carried out by FTIR, DR UV-Vis, XRD, FESEM, EDX spectroscopy, elemental scanning mappings, thermogravimetric analysis (TGA/DTG), and nitrogen adsorption-desorption isotherm. The amount of manganese salophen loading on the CFG support was determined by inductively coupled plasma spectroscopy (ICP). At room temperature, the as-prepared catalyst was applied to oxidize olefins with H<sub>2</sub>O<sub>2</sub> as a green oxidant. The result confirmed this catalyst's high catalytic reactivity and excellent selectivity in the epoxidation of various alkenes. The effects of different factors such as the kind of solvent and oxidant, amount of catalyst and oxidant, and reaction time were also studied. Furthermore, the GO-bound Mn salophen was reused for several runs without any noticeable activity loss or selectivity. https://www.inorgchemres.org/article_142399_652662a33d3c4917119abbde34656080.pdfIranian Chemical SocietyInorganic Chemistry Research2538-18656120220701Nano-Ferrite ZnFe2O4: as Efficient and Re-Usable Catalyst for the synthesis of 4H-Chromenes and 4H-Pyrano[2,3-c]pyrazoles101614290710.22036/icr.2021.304989.1118ENRazieh NejatFaculty of Sciences, Department of Chemistry, Kosar University of Bojnord, Iran0000-0001-8742-2342Journal Article20210915Nano-magnetic ferrite ZnFe<sub>2</sub>O<sub>4</sub> among other magnetic nanoparticles include Fe<sub>2</sub>O<sub>3</sub>, Fe<sub>3</sub>O<sub>4</sub>, Ni<sub>(0.7)</sub>Zn<sub>(0.3)</sub>Fe<sub>2</sub>O<sub>4</sub> and Mn<sub>(0.7)</sub>Zn<sub>(0.3)</sub>Fe<sub>2</sub>O<sub>4</sub> was explored as an efficient catalyst for the synthesis of various 4H-Chromenes and 4H-Pyrano[2,3-c]pyrazoles in EtOH/H<sub>2</sub>O (2:1) via an easy and green procedure. The desired products were obtained in high yields via a three-component reaction between aromatic aldehydes with malononitrile and 5,5-dimethyl-cyclohexane-1,3-dione or 3-methyl-1-phenyl-2-pyrazolin-5-one at room temperature. The structure of this catalyst was fully characterized via Fourier transform infrared spectroscopy, XRD, SEM, TEM, EDAX, and VSM. The employed nanocatalyst was easily recovered using a magnetic field and reused ten times (in subsequent runs) without observation a significant decrease in activity. https://www.inorgchemres.org/article_142907_9dc49e4ad6281da644700528ed1e58f4.pdfIranian Chemical SocietyInorganic Chemistry Research2538-18656120220701The effect of azide and thiocyanate anions on the coordination mode of thiocarbohydrazone ligand in preparing Mn(II) coordination compounds172514338310.22036/icr.2021.318068.1122ENPegah AsadollahiDepartment of Chemistry, Faculty of Science, Imam Khomeini International University, 34148-96818, Qazvin, IranRahman BikasDepartment of Chemistry, Faculty of Science, Imam Khomeini International
University, 34148-96818, Qazvin, Iran0000-0003-0078-7571Marta S. KrawczykDepartment of Analytical Chemistry, Faculty of Pharmacy, Wrocław Medical University, Borowska 211A St, Wrocław, 50-556, PolandMilosz SiczekFaculty of Chemistry, University of Wroclaw, Joliot-Curie 14, Wroclaw 50-383, PolandTadeusz LisFaculty of Chemistry, University of Wroclaw, Joliot-Curie 14, Wroclaw 50-383, PolandJournal Article20211203Two new Mn(II) coordination compounds, [Mn(HL)(NCS)(Cl)(CH<sub>3</sub>OH)] (<strong>1</strong>) and [Mn<sub>4</sub>(L)<sub>2</sub>(µ-N<sub>3</sub>)<sub>4</sub>(N<sub>3</sub>)<sub>0.5</sub>(Cl)<sub>1.5</sub>(CH<sub>3</sub>OH)<sub>2</sub>]·3.5(CH<sub>4</sub>O) (<strong>2</strong>), were synthesized and characterized by elemental analysis and spectroscopic methods where HL is bis-[(<em>E</em>)-<em>N'</em>-(methyl(pyridin-2-yl)methylene)]thiocarbohydrazide. The compounds were synthesized by the reaction of HL, MnCl<sub>2</sub>∙4H<sub>2</sub>O and KSCN (in <strong>1</strong>) or NaN<sub>3</sub> (in <strong>2</strong>) with 1:2:4 molar ratios in methanol. The crystal structures of <strong>1</strong> and <strong>2</strong> were determined by single-crystal X-ray diffraction analysis which revealed that <strong>1</strong> is a mononuclear Mn(II) coordination compound while <strong>2</strong> is an azido bridged tetranuclear Mn(II) cluster. In both <strong>1</strong> and <strong>2</strong> the Mn(II) ions have octahedral coordination environment which is created by coordination of nitrogen and sulfur atoms from thiocarbohydrazone ligand. In compound <strong>1</strong> the ligand acts as a neutral tridentate N<sub>2</sub>S-donor ligand while in <strong>2</strong> it acts as mononegative N<sub>4</sub>S-donor ligand. In <strong>2</strong>, the azide anions act as both terminal and bridging ligand and four Mn(II) ions are connected together by four bridging azide ligands. Furthermore, the Mn(II) ions in <strong>2</strong> are also connected together by sulfur atoms of the thiocarbohydrazone ligand. The FT-IR spectra of <strong>1</strong> and <strong>2</strong> show the characteristic bands of SCN<sup>–</sup> and N<sub>3</sub><sup>–</sup> anions, respectively. The analysis indicated that the pseudo-halide SCN<sup>–</sup> and N<sub>3</sub><sup>–</sup> anions have considerable effect on the structure and nuclearity of the coordination compounds. The formation of tetranuclear cluster in the presence of azide anion was attributed to its higher ability to act as bridging group and also its relatively basic character which influence on the coordination mode of the thiocarbohydrazone ligand.https://www.inorgchemres.org/article_143383_d9cb8ab42adf7d4a68e24d1c42bb10d1.pdfIranian Chemical SocietyInorganic Chemistry Research2538-18656120220701[Cu(3-hydroxy-2-naphtoate)2].4H2O: A Novel Reusable Heterogeneous Catalyst for Synthesis of Polyhydroquinoline and 2,3-Dihydroquinazoline- 4(1H)-one Derivatives263014514510.22036/icr.2022.285419.1102ENAlireza KhoshdastDepartment of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, IranS. Ali BeyramabadiDepartment of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, IranSadegh AllamehDepartment of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, IranMaryam KhashiYoung Researchers and Elite Club, Mashhad Branch, Islamic Azad University, Mashhad, IranAli MorsaliDepartment of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran0000-0002-8569-2442Mehdi PordelDepartment of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran0000-0003-3445-8792Journal Article20210509Abstract<br />Herein, the catalytic performance of [Cu(3-hydroxy-2-naphtoate)<sub>2</sub>].4H<sub>2</sub>O complex has been examinated in synthesis of polyhydroquinoline and 2,3-dihydroquinazoline-4(1H)-one derivatives. The catalytic reactions have been carried out in solvent-free conditions. The obtained results have showed that the complex has high catalytic activity, so that the desired products were obtained in good to high yields. Moreover, the investigated catalyst was found to be reusable, which could be achieved after 3rd run with a considerable catalytic activity.https://www.inorgchemres.org/article_145145_46e85605705a030238f83cacdf557814.pdfIranian Chemical SocietyInorganic Chemistry Research2538-18656120220701Synthesis of a new hybrid material based on Cr2O3 nanoparticles encapsulating phosphotungstic acid as an efficient photocatalyst to degrade a synthetic opioid: Methadone313814575510.22036/icr.2022.317862.1121ENFarshid KazemiDepartment of Applied Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, IranHasan Ali ZamaniDepartment of Applied Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran0000-0003-3837-3745Mohamad Reza AbediDepartment of Applied Chemistry, Quchan Branch, Islamic Azad University, Quchan, Iran0000-0002-1262-4414Mahmoud EbrahimiDepartment of Applied Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, IranJournal Article20211201Methadone is a synthetic drug utilized to manage chronic pain and treat opioid maintenance. The drug enters water bodies as a contaminant due to its widespread use in various communities, which is usually not removed by wastewater treatment plants. Therefore, a photodegradation procedure was developed to degrade and remove methadone in water samples. A hydrothermal strategy was applied to prepare three photocatalysts based on Cr<sub>2</sub>O<sub>3</sub> nanoparticles, a polyoxometalate (phosphotungstic acid), and a hybrid material (Cr<sub>2</sub>O<sub>3</sub> nanoparticles encapsulating phosphotungstic acid). The effective factors, such as methadone concentration, pH, photocatalyst amount, and H<sub>2</sub>O<sub>2</sub> concentration, in the photodegradation method for each catalyst were optimized by an experimental design using a central composite design. Under the optimum conditions, the kinetic model and maximum photodegradation efficiency of the process for each catalyst were studied to compare their ability for methadone degradation. The maximum photodegradation efficiencies for methadone degradation using phosphotungstic acid and Cr<sub>2</sub>O<sub>3</sub> nanoparticles were 82.00 and 77.18% for 120 min. In comparison, the maximum photodegradation efficiency in the presence of Cr<sub>2</sub>O<sub>3</sub> nanoparticles encapsulating phosphotungstic acid was 90.11% for 100 min. The results indicated the new hybrid material prepared from encapsulating phosphotungstic acid with Cr<sub>2</sub>O<sub>3</sub> nanoparticles, leading to a proper increase in the methadone degradation and reducing the degradation time significantly. https://www.inorgchemres.org/article_145755_6c5ae9104ce2c1075888781d1f95260b.pdfIranian Chemical SocietyInorganic Chemistry Research2538-18656120220701Recent advances on phosphorescent cycloplatinated compounds containing tetradentate nitrogen ligands for OLED applications394714667710.22036/icr.2022.325512.1123ENFerran RequenaDepartament de Química Inorgànica i Orgànica, Secció de Química Inorgànica, Universitat de Barcelona, Martí i Franquès 1-11, E-08028 Barcelona, SpainMargarita CrespoDepartament de Química Inorgànica i Orgànica, Secció de Química Inorgànica, Universitat de Barcelona, Martí i Franquès 1-11, E-08028 Barcelona, Spain0000-0002-7086-9751Journal Article20220119Tetradentate platinum(II) emitters are a research topic of great interest since they can be used as dopants for organic light emitting diodes (OLEDs). These compounds benefit from the square-planar geometry of platinum(II) and the rigidity of the tetradentate ligand. Cyclometallated ligands are particularly appealing since they are thermally stable and display a high ligand field splitting which favors efficient emission. The photophysical properties of these complexes can be tuned by structural modifications, introduction of substituents or control of the intermolecular interactions. Several of the studied compounds have been successfully tested for electroluminescent devices. An overview of the advances reported in this field for the last five years is presented in this work.https://www.inorgchemres.org/article_146677_1478dc26ccd9e96d1c806c7cd6716bc7.pdfIranian Chemical SocietyInorganic Chemistry Research2538-18656120220701New copper(II) complexes with benzimidazole and benzoxazole heterocyclic ligands: synthesis, spectral characterization, FMO, MEP, NBO, and DFT study485714793510.22036/icr.2022.327584.1124ENHadi KargarDepartment of Chemical Engineering, Faculty of Engineering, Ardakan University, P.O. Box 184, Ardakan, Iran.0000-0002-2817-0937Mehdi Fallah-MehrjardiDepartment of Chemistry, Payame Noor University, 19395-3697, Tehran, IranReza Behjatmanesh-ArdakaniDepartment of Chemistry, Payame Noor University, 19395-3697, Tehran, IranKhurram Shahzad MunawarDepartment of Chemistry, University of Sargodha, Punjab, PakistanDepartment of Chemistry, University of Mianwali, Mianwali, PakistanJournal Article202202013-Ethoxy salicylaldehyde on reaction with 1,2-phenylenediamine and 2-aminophenol yielded heterocyclic ligands (HLBIZ and HLBOZ) under ultrasonic irradiation in ethanol solvent. The reaction of these ligands with copper(II) acetate monohydrate salt led to the related Cu(L)<sub>2</sub> complexes in methanol solvent. FT-IR, <sup>1</sup>H & <sup>13</sup>C NMR, and elemental analysis were used to investigate the structures of the synthesized ligands, while the copper(II) complexes were characterized by CHN analysis and FT-IR spectroscopy. The imino nitrogens and phenolic oxygens are involved in the coordination of the ligands to the Cu<sup>2+</sup> ions to generate the complex. The parameters estimated by DFT at the B3LYP/Def2-TZVP level of theory show that the theoretical values are consistent with the experimental findings.https://www.inorgchemres.org/article_147935_fd25b1a002ace0d2177feeff755fe9d5.pdfIranian Chemical SocietyInorganic Chemistry Research2538-18656120220701Oxidative Addition Reactions of Binuclear Organoplatinum Complexes with Ditopic Ligands586714870010.22036/icr.2022.327842.1125ENMatthew S.McCreadyDepartment of Chemistry
University of Western OntarioRichard J.PuddephattDepartment of Chemistry
University of Western Ontario0000-0002-9846-3015Journal Article20220202The chemistry of <em>bis</em>[dimethylplatinum(II)] complexes of four ditopic ligands based on anthracene [1,8-C<sub>14</sub>H<sub>8</sub>(N=CH-2-C<sub>5</sub>H<sub>4</sub>N)<sub>2</sub>, <strong>L1</strong>, and 1,8-C<sub>14</sub>H<sub>8</sub>(CC-4-C<sub>6</sub>H<sub>4</sub>-N=CH-2-C<sub>5</sub>H<sub>4</sub>N)<sub>2</sub>, <strong>L2</strong>] or 2,7-di-<em>t</em>-butyl-9,9-dimethyl-xanthene [4,5-C<sub>23</sub>H<sub>28</sub>O(N=CH-2-C<sub>5</sub>H<sub>4</sub>N)<sub>2</sub>, <strong>L3</strong>, and [4,5-C<sub>23</sub>H<sub>28</sub>O(C(=O)NH-4-C<sub>6</sub>H<sub>4</sub>-N=CH-2-C<sub>5</sub>H<sub>4</sub>N)<sub>2</sub>, <strong>L4</strong>] backbones. Each complex [(PtMe<sub>2</sub>)<sub>2</sub>(<strong>L1</strong>)] - [(PtMe<sub>2</sub>)<sub>2</sub>(<strong>L4</strong>)] reacted with MeI to give the corresponding platinum(IV) complex [(PtIMe<sub>3</sub>)<sub>2</sub>(<strong>L1</strong>)] - [(PtIMe<sub>3</sub>)<sub>2</sub>(<strong>L4</strong>)] as a mixture of two isomers which equilibrated slowly at room temperature. The complex [(PtMe<sub>2</sub>)<sub>2</sub>(<strong>L3</strong>)] also underwent oxidative addition with PhCH<sub>2</sub>Br, I<sub>2</sub> or HgBr<sub>2</sub> to give [(PtBrMe<sub>2</sub>CH<sub>2</sub>Ph)<sub>2</sub>(<strong>L3</strong>)], [(PtI<sub>2</sub>Me<sub>2</sub>)<sub>2</sub>(<strong>L3</strong>)] or [(PtBrMe<sub>2</sub>)<sub>2</sub>(Hg)(<strong>L3</strong>)] respectively, the last containing a Pt-Hg-Pt unit. Finally, the complexes [(PtIMe<sub>3</sub>)<sub>2</sub>(<strong>L3</strong>)] and [(PtIMe<sub>3</sub>)<sub>2</sub>(<strong>L4</strong>)] reacted with silver triflate and pyrazine (C<sub>4</sub>H<sub>4</sub>N<sub>2</sub>) to give the complexes [(PtMe<sub>3</sub>)<sub>2</sub>(C<sub>4</sub>H<sub>4</sub>N<sub>2</sub>)(<strong>L3</strong>)][O<sub>3</sub>SCF<sub>3</sub>]<sub>2</sub> and [(PtMe<sub>3</sub>)<sub>2</sub>(C<sub>4</sub>H<sub>4</sub>N<sub>2</sub>)(<strong>L4</strong>)][O<sub>3</sub>SCF<sub>3</sub>]<sub>2</sub>, respectively, each of which contains a bridging pyrazine ligand.https://www.inorgchemres.org/article_148700_b708de7c0015bc4e77fb108f690a62f7.pdfIranian Chemical SocietyInorganic Chemistry Research2538-18656120220701Synthesis, DFT calculations and catalytic activity in the Biginelli reaction of two hydrazone Cu(II) complexes697515049610.22036/icr.2022.336558.1127ENZahra GhamatiDepartment of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, IranMehdi PordelDepartment of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran0000-0003-3445-8792Abolghasem DavoodniaDepartment of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, IranS. Ali BeyramabadiDepartment of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, IranJournal Article20220408In this work, two Cu(II) complexes containing 5-amino-1-R-1H-benzimidazol-4-yl)(4-chloro)phenylmethanone hydrazones ligands were synthesized and their spectral characterization, DFT calculations, and catalytic activity were reported. New heterocyclic hydrazone ligands were prepared by the reaction of o-amino-ketones with hydrazine hydrate in high yield. Structural assignments of new compounds were based on their microanalytical and spectral data and formula [Cu(L)2(H2O)2](SO4) was suggested for complexes. Moreover, to gain a further insight into the geometry of synthesized complexes, the DFT calculations were carried out at the B3LYP/6-311+G(d,p) level of theory. The catalytic activity of Cu(II) complexes as heterogeneous catalysts were also investigated in the synthesis of biologically active compound 3,4-dihydropyrimidin-2(1H)-one C5 ester, via classical Biginelli reaction followed by trans-esterification reaction. The results confirmed that the current method formed the products at the lower reaction time and high yields, which might as a result of the enhanced reactivity of the reactants on the surface sites of Cu(II) complexes.https://www.inorgchemres.org/article_150496_e4a64e721848f3f9e9bff4acfe576d96.pdfIranian Chemical SocietyInorganic Chemistry Research2538-18656120220701Synthesis, spectral characterization, and theoretical investigation of Pd(II) complex incorporating unsymmetrical tetradentate Schiff base ligand and its application in Suzuki–Miyaura cross-coupling reaction768315097310.22036/icr.2022.337714.1128ENHadi KargarDepartment of Chemical Engineering, Faculty of Engineering, Ardakan University, P.O. Box 184, Ardakan, Iran0000-0002-2817-0937Mehdi Fallah-MehrjardiDepartment of Chemistry, Payame Noor University (PNU), 19395-4697, Tehran, IranReza Behjatmanesh-ArdakaniDepartment of Chemistry, Payame Noor University (PNU), 19395-4697, Tehran, IranKhurram ShahzadMunawarDepartment of Chemistry, University of Sargodha, Punjab, PakistanDepartment of Chemistry, University of Mianwali, Mianwali, Pakistan0000-0001-9055-2519Mehrnaz BahadoriCatalysis Division, Department of Chemistry, University of Isfahan, 81746-73441, Isfahan, IranMajid MoghadamCatalysis Division, Department of Chemistry, University of Isfahan, 81746-73441, Isfahan, Iran0000-0001-8984-1225Journal Article20220415A new palladium(II) complex is synthesized via the treatment of unsymmetrical tetradentate Schiff base (H2LUns) with Pd(CH3COO)2. An analytical technique like combustion analysis for the estimation of C, H, and N and other spectroscopic techniques such as FT-IR and 1H NMR were used to elucidate the structural confirmation of the synthesized complex. Furthermore, the theoretical parameters of the optimized structures calculated by the DFT employing the B3LYP/Def2-TZVP level of theory were carried out to correlate the calculated findings with the actual data obtained experimentally. The spectroscopic and theoretical data findings revealed that the ligand is coordinated via phenolic oxygen and imine nitrogen atoms. Moreover, the catalytic activity of the palladium(II) complex was studied in the Suzuki-Miyaura cross-coupling reactions (SMCR).https://www.inorgchemres.org/article_150973_c42bc314bd4c2449555cf02a72ba609e.pdfIranian Chemical SocietyInorganic Chemistry Research2538-18656120220701Supporting VO(acac)2 and MoO2(acac)2 onto amine and imine-functionalized natural diatomite nanoparticles: Efficient catalysts for epoxidation of olefins using TBHP849215496410.22036/icr.2022.346600.1130ENSahar AsadiDepartment of Chemistry, Shahrood University of Technology, Shahrood, Iran0000-0002-4090-2776Bahram BahramianDepartment of Chemistry, Shahrood University of Technology, Shahrood, Iran0000-0002-0665-2697Vahid MirdarvatanDepartment of Chemistry, Shahrood University of Technology, Shahrood, Iran0000-0003-4188-5645Journal Article20220611Abstract<br />The natural diatomite nanoparticles (Dt) were covalently functionalized by 3-(trimethoxysilyl)-propylamine (MSPA) and salicylaldehyde to support VO(acac)2 and MoO2(acac)2 precursor complexes. The prepared compounds were characterized by FT-IR, PXRD, SEM, EDX, ICP, and BET techniques. Then they were used to catalyze the heterogeneous epoxidation of cis‐cyclooctene as a model alkene using tert-butyl hydroperoxide (TBHP). Various parameters that affect catalytic efficiency were investigated, and the optimized experimental conditions were successfully used for the epoxidation of other linear and non-linear alkenes. The important advantages of these new catalytic systems are their simple preparation, low catalyst loading, and high product yield. Moreover, these catalysts can be used up to three times for an efficient epoxidation of cis‐cyclooctene.https://www.inorgchemres.org/article_154964_098afa30e4a48b7f14d26fe77708e805.pdfIranian Chemical SocietyInorganic Chemistry Research2538-18656120220701Computational Study of Multiple Pathways and Ion-Pairing in Oxidative Addition of Iodomethane to a Binuclear Organoplatinum(II) Complex containing Imine and Phosphine Bridging Ligands939715854710.22036/icr.2022.353871.1133ENAllan J.CantySchool o Natural Sciences – Chemistry, University of Tasmania, Private Bag 75, Hobart, Tasmania 7001, Australia0000-0003-4091-6040Alireza AriafardSchool o Natural Sciences – Chemistry, University of Tasmania, Private Bag 75, Hobart, Tasmania 7001, Australia0000-0003-2383-6380S. Masoud NabavizadehDepartment of Chemistry, College of Sciences, Shiraz University, Shiraz 71454, Iran0000-0003-3976-7869Journal Article20220729A density functional theory (DFT) study of the reaction of [Me<sub>2</sub>Pt(µ-NN)(µ-dppm)PtMe<sub>2</sub>] (<strong>1</strong>) (NN = phthalazine, dppm = bis(diphenylphosphino)methane) with two equivalents of iodomethane in acetone (<strong>A</strong>) and benzene (<strong>B</strong>) reveals a mechanism in agreement with spectrocopic and kinetic data reported earlier by Rashidi and coworkers, for which computation permits additional insights. Following initial oxidation at one platinum(II) centre to form mixed valence outer-sphere ion-pairs containing a Pt<sup>II</sup>→Pt<sup>IV</sup> interaction, [Me<sub>3</sub>Pt<sup>(+)</sup>(µ-NN)(µ-dppm)PtMe<sub>2</sub><strong>·</strong>I<sup>(-)</sup>] (<strong>6A</strong>, <strong>7B</strong>), two competing mechanisms are found for the second oxidative addition at the remaining platinum(II) centre. In one mechanism (Path I), a rearrangement of intermediate <strong>6A</strong> and <strong>7B</strong> to form [Me<sub>3</sub>Pt(κ<sup>1</sup>-NN)(µ-dppm)(µ-I)PtMe<sub>2</sub>] (<strong>2aA</strong>, <strong>2aB</strong>) occurs prior to oxidative addition giving, after subsequent steps, outer-sphere ion-pairs [Me<sub>3</sub>Pt(κ<sup>1</sup>-NN)(µ-dppm)(µ-I)PtMe<sub>3</sub><sup>(+)</sup><strong>·</strong>I<sup>(-)</sup>] (<strong>10A</strong>,<strong> 10B</strong>), followed by dissociation of phthalazine and formation of the product complex [Me<sub>3</sub>Pt(µ-dppm)(µ-I)<sub>2</sub>PtMe<sub>3</sub>] (<strong>4A</strong>, <strong>4B</strong>) containing two Pt<sup>IV</sup> centres.. In the other mechanism (Path 1I), oxidative addition occurs at the Pt<sup>II</sup> centre of <strong>7A</strong> and <strong>7B</strong>, leading also to <strong>10A</strong> and <strong>10B</strong>. Paths I and II are competitive in acetone, but Path I is preferred in benzene. The first oxidative addition computes as having a lower barrier than the second, in accord with experiment, and we attribute this to the occurrence of a Pt<sup>a</sup>···Pt<sup>b</sup> interaction assisting the first oxidative addition at Pt<sup>b</sup>.https://www.inorgchemres.org/article_158547_e3b64ecf8bfd8e9e44aaf951df68f104.pdf