Multiple coordination modes of hemilabile 3-dimethylaminopropyl chalcogenolates in platinum(II) complexes: Synthesis, spectroscopy and structures

Abstract

The reactions of N, N-dimethylaminopropyl chalcogenolates with platinum(II) compounds have been carried out and complexes of the types [PtCl(ECH 2CH 2CH 2NMe 2)] 2 ( 1) (E = S ( 1a) and Se ( 1b)), [Pt(ECH 2CH 2CH 2NMe 2) 2] n ( 2) (E = S ( 2a) and Se ( 2b)), [(PtCl 2) 2{(Me 2NCH 2CH 2CH 2E) 2}] n ( 3), [PtX(SeCH 2CH 2CH 2NMe 2)] 2 ( 4) (X = SePh ( 4a) and OAc ( 4b)) and [PtCl(ECH 2CH 2CH 2NMe 2)(PR 3)] n ( 5) (E = S, Se, Te) have been isolated. These complexes have been characterized by elemental analysis, IR, UV–Vis, NMR ( 1H, 13C, 31P, 77Se, 195Pt) spectroscopy and FAB mass spectral data. The structures of [PtCl(SeCH 2CH 2CH 2NMe 2)] 2 ( 1b) and [PtCl(SCH 2CH 2CH 2NMe 2)(PPr 3)] 2 ( 5a) have been established by single crystal X-ray diffraction data. Both the molecules have dimeric structures. In 1b, two platinum atoms are held together by symmetrically bridging Se atoms of the chelating selenolate groups. In 5a, two thiolates form a four-membered Pt 2S 2 bridge with dangling NMe 2 groups.