New insight into the reactions of organoplatinum(II) complexes with diorganotin dichloride and diisothiocyanate: Oxidative addition, reductive elimination and α-elimination

Publication date: Available online 29 November 2018Source: Journal of Organometallic ChemistryAuthor(s): Badri Z. Momeni, Nastaran Fathi, Milad Moghadasi, Abbas Biglari, Jan JanczakAbstractThe reaction of electron rich [PtMe2(NN)] with SnMe2Cl2 in a 1:3/Pt:Sn mole ratio resulted in formation of Pt(IV) complexes [PtMe2(SnMe2Cl)Cl(NN)] {NN = 4,4ꞌ-Me2bpy (4,4′-dimethyl-2,2′-bipyridine) (7); 5,5ꞌ-Me2bpy (5,5′-dimethyl-2,2′-bipyridine) (8); bphen (4,7-diphenyl-1,10-phenanthroline) (9)}. NMR data show that the resulting complexes exist as the sole product corresponding to that of trans oxidative addition of SnMe2Cl2. The yellow polymorph of complex [PtCl2(5,5ꞌ-Me2bpy)] (10) was characterized by X-ray crystallography from the reaction of [PtMe2(5,5ꞌ-Me2bpy)] and excess of SnMe2Cl2 due to the reductive elimination of 8. On the other hand, the reaction of [PtMe2(NN)] with SnEt2Cl2 in a 1:3/Pt:Sn mole ratio resulted in formation of new complexes [PtMe2(SnEt2Cl)Cl(4,4ꞌ-Me2bpy)] (11), [PtMe2(SnEt2Cl)Cl(5,5ꞌ-Me2bpy)].SnEt2Cl2 (12) and [PtMe2(SnEt2Cl)Cl(bu2bpy)].SnEt2Cl2 (bu2bpy = 4,4′-di-tert-butyl-2,2′-dipyridine) (13). NMR data indicate that the PtSnEt2Cl bond is weaker than the PtSnMe2Cl bond. The X-ray crystal structure of 13 reveals that organoplatinum(IV) complex acts as a donor to the SnEt2Cl2 to form an adduct in a distorted trigonal bipyramid with the axial Cl⋯SnCl and equatorial SnEt2Cl units. Moreover, the X-ray crystal structure of the new yellow ...

Source: Journal of Organometallic Chemistry - November 29, 2018 Category: Chemistry Source Type: research