2-(Dimethylamino)ethaneselenolates of palladium(II): synthesis, structure, spectroscopy and transformation into palladium selenide

Abstract

Bis[2-(dimethylamino)ethyl] diselenide was prepared by the reaction of Na₂Se₂ with ClCH₂CH₂NMe₂. 2-(Dimethylamino)ethaneselenolate complexes of palladium(II) of the type [PdCl(SeCH₂CH₂NMe₂)]₃1, [PdCl(SeCH₂CH₂NMe₂)(PR₃)] 2, [Pd₂Cl₃(SeCH₂CH₂NMe₂)(PR₃)₂] 3 and [Pd(SeCH₂CH₂NMe₂)₂(PPh₃)₂] 4 have been synthesized and characterized by elemental analysis, IR and NMR (¹H, ³¹P, ⁷⁷Se) spectroscopy. The structures of orange 1 and of violet (λ_max = 514 nm) 2c have been established by single crystal X-ray diffraction analyses. The trimer 1 contains a six-membered Pd₃Se₃ ring in twist conformation. The thermal behaviour of three complexes, yielding Pd₁₇Se₁₅ has been investigated.