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Title of article :
Comparison of coordination mode of some biphosphine ligands in cyclometalated organoplatinum(II) complexes
Author/Authors :
Ahmad R. Esmaeilbeig، نويسنده , , Mohsen Golbon Haghighi، نويسنده , , Sahebeh Nikahd، نويسنده , , Sara Hashemi، نويسنده , , Mohammad Mosarezaee، نويسنده , , Mehdi Rashidi، نويسنده , , S. Masoud Nabavizadeh، نويسنده ,
Issue Information :
دوفصلنامه با شماره پیاپی سال 2014
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Abstract :
The reaction of the cyclometalated complexes [PtR(CˆN)(SMe2)], 1, in which R is Me or 4-MeC6H4, and CˆN is either ppy (deprotonated 2-phenylpyridine) or bhq (deprotonated benzo-h-quinoline), with 1,2-bis[bis(pentafluorophenyl)phosphino]ethane (dfppe), were studied. When 0.5 equiv of dfppe was added, the binuclear cyclometalated Pt(II) complexes [Pt2R2(CˆN)2(μ-dfppe)], 2i–l, were formed, which are the first examples of diplatinum complexes with bridging dfppe ligands. When the ligand dfppe was reacted with complex 1 in the ratio of 1:1, only in the case of R = Me and CˆN = ppy, the complex [Pt(Me)(κ1-ppy)(κ2-dfppe)], 4d, was obtained, in which the ppy ligand is monodentate and dfppe is chelating, and in other cases the dimers 2j–l were formed. The results were compared, using density functional theory (DFT), with other diphosphine ligands, 1,1-bis(diphenylphosphino)methane (dppm) and 1,2-bis(diphenylphosphino)ethane (dppe) to clarify the electronic and steric effects of diphosphine ligands on their coordination mode ability.
Keywords :
Organoplatinum , phosphine ligands , DFT calculations
Journal title :
Journal of Organometallic Chemistry
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