Synthesis, characterisation and electronic properties of a series of plaitnum(II) poly-ynes containing novel thienyl-pyridine linker groups

摘要

The synthsis and characterisation of a series of novel-yne polymers, trans-[-(P~nBu_3)_2Pt(C ident to C-L-C ident to C)-]_n (L = (2-(2'-thienyl)-pyridine (L1), 2,5-bis(2'-thienyl)pyridine (L2), 6,6'-bis(2"-thienyl)-3,3'-bipyridine (L3)), and the corresponding platinum trans-[(PEt_3)_2(Ph)Pt(C ident to CLC ident to C)Pt(Ph)(PEt_3)_2] are described. The dimers were prepared by the reaction of two equivalents of trans-[Pt(PEt_3)_2(Ph)Cl] without one equivalent of the dieterminal diyne HC ident to C-L-C ident to CH, in CuI catalysed dehydrohalogenation reactions in CH_2Cl_2-Pr_2~iNH, while the polymers are obtained similarly from the diyne and one equivalent of trans-[Pt(P~nBu_3)_2Cl_2]. The optical absorption and photoluminescence spectra of the polymers with L1 and L2 linker groups are reported. The optical gaps are 465 nm (2.67 eV) and 486 nm (2.55 eV), respectively. The photoluminescence spectrum for each polymer exhibitsone band at room temperature. At 10 K, low-energy emission bands emerge which are attributed to emission from the triplet excited state. The results of these studies are compared with those obtained for other platinum-containing poly-yne and related organometallic polymers.