Syntheses and characterization of heterobimetallic complexes (dppf)Pt(dithiolate) (dppf: bis(diphenylphosphino)ferrocene); X-ray crystal structures of (dppf)PtL where L=dmit,phdt and i-mnt |
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| Institution: | 1. Department of Chemistry, College of Science, Tikrit University, Tikrit, Iraq;2. Department of Chemistry, College of Science, King Saud University, Riyadh, KSA,PO. Box 2455, Riyadh 11451, Saudi Arabia;3. Department of Dentistry, Kut University College, Kut, Wasit 52001, Iraq;4. College of Medical Technology, The Islamic University, Najaf, Iraq;5. Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia;6. Pharmaceutical Medicinal Chemistry & Drug Design Department, Faculty of Pharmacy, Al-Azhar University, Cairo 11884, Egypt;7. Department of Biochemistry, College of Veterinary Medicine, Tikrit University, Tikrit, Iraq;1. Department of Chemistry, College of Science, Chemistry Tikrit University, Tikrit, Iraq;2. Department of Chemistry, College of Science, University of Sulaimani, KRG, Iraq;3. Department of Physics - University of Sargodha, Punjab, Pakistan;4. Chemistry Department, Faculty of Science, King AbdulazizUniversity, B.O. 80203, Jeddah 21589, Saudi Arabia;5. Chemistry Department, Faculty of Science, Cairo University, Giza 12613, Egypt;6. Department of Chemistry, College of Education for Pure Science, University of Mosul, Iraq |
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| Abstract: | Heterobimetallic complexes of the type (dppf)PtL (dppf=1,1′-bis(diphenylphosphino)ferrocene; L=dmit (1,3-dithiole-2-thione-4,5-dithiolate), dddt (5,6-dihydro-1,4-dithiin-2,3-dithiolate), phdt (6-hydro-5-phenyl-1,4-dithiin-2,3-dithiolate), dphdt (5,6-diphenyl-1,4-dithiin-2,3-dithiolate), mtdt (1,2-bis(methylthio)ethylene-1,2-dithiolate), i-mnt (2,2-dicyano-1,1-ethylenedithiolate)) have been synthesized and studied by a high-resolution FAB-MS, cyclic voltammetry and 31P NMR. (Dppf)Pt(i-mnt) exhibits one reversible redox peak at E1/2=1.225 V and a strong Pt–P coupling constant (JPt–P=3237 Hz) due to the electron-accepting property of i-mnt ligand. On the contrary, (dppf)Pt(mtdt) shows three reversible redox peaks corresponding to dppf]0/+ (E1/21=0.470 V), Pt(mtdt)]0/+ (E1/22=1.050 V) and Pt(mtdt)]+/2+ (E1/23=1.405 V) processes and a weak Pt–P coupling constant (JPt–P=2962 Hz) due to relatively strong electron-donor property of mtdt ligand. X-ray structural analyses were performed for the three complexes: (dppf)PtL where L=dmit, phdt and i-mnt. The P2PtS2 core shows a distorted square planar geometry for the three complexes with P(1)–Pt–P(2) bite angle being larger than 96°. The S(1)–Pt–S(2) bite angle of the i-mnt complex is the smallest (74.42°) because of the formation of the four-membered ring. |
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