Synthesis of Novel Trialkyl(trichlorostannyl)platinum(IV) Complexes through SnCl2 Insertion into the Pt−Cl Bond
摘要:
Reaction of SnCl2 with the trialkylplatinum(IV) complexes [PtClMe2(R)(bipy)] (1) resulted in the formation of the novel trialkyl(trichlorostannyl)platinum(IV) complexes [PtMe2(R)(SnCl3)(bipy)] (R = allyl (2a), Me (2b), Bz (2c)). The solid-state molecular structure of fac-[PtMe3(SnCl3)(bipy)) revealed a direct Pt-Sn bond (2.6497(2) Angstrom) and three almost identical Pt-Me bond lengths (2.065(5) and 2.068(8) Angstrom both cis and 2.069(5) Angstrom trans to SnCl3). The presence of platinum satellites ((1)J(SnPt) = 3267-4260 Hz) in the (119)Sri NMR spectra of complexes 2 indicates that the direct platinumtin bond is maintained in solution. Addition of 1 equiv of PPh3 to complexes 2 resulted in the formation of the trichlorostannate complexes fac-(PtMe2(R)(bipy)(PPh3)][SnCl3] (3). The absence of platinum satellites on the Sn-119 NMR signal of 3 confirmed the ionic character of these complexes in solution.