Synthesis, structures and properties of platinum(II) complexes of oligoacetylenic sulfides
Abstract
A series of novel platinum(II) acetylide complexes incorporating sulfur-linked oligoalkynes have been prepared. The CuI-catalysed dehydrohalogenation reactions of the mono-protected dialkyne CSC
C(TIPS) (
CSC
C(TIPS)}2] 1, cis-[Pt(dppe){C
CSC
C(TIPS)}2] 3 and cis-[Pt(Me2bipy){C
CSC
C(TIPS)}2] 7, respectively, in good yields. Similar synthetic procedures using a diacetylenic sulfide species HC
CSC
CC
CSC
C(TIPS) afforded trans-[Pt(PBu3)2{C
CSC
CC
CSC
C(TIPS)}2] 2 and cis-[Pt(dppe){C
CSC
CC
CSC
C(TIPS)}2] 4, both of which contain eight triple-bond units within the
CSC
C–Pt(PEt3)2Ph] 5 and trans-[Ph(Et3P)2Pt–C
CSC
CC
CSC
C–Pt(PEt3)2Ph] 6 were also synthesized in moderate yields by reactions of two equivalents of trans-[PtPh(Cl)(PEt3)2] and the diterminal acetylenic sulfides HC
CSC
CH and HC
CSC
CC
CSC
CH in a CuI/(Me3Si)2NH system. All of the compounds 1–7 have been characterized by