Palladium-Catalyzed Dithiolation of Platinum(II) Alkynylarylacetylides with Diphenyl Disulfide Leading to Construction of π-Conjugated Systems with Platinum and Thio Groups

摘要

π-Conjugated systems consisting of platinum, sulfur, alkyne, and arene units were synthesized by palladium-catalyzed addition of organic disulfides to platinum acetylides. When diphenyl disulfide was treated with platinum(II) complexes containing extended alkynyl ligands, trans-(R_3P)_2Pt(C≡C-Ar-C≡C-H)_2, in the presence of Pd(PPh_3)_4 catalyst, new sulfur-containing platinum(II) bis(alkenylarylacetylide) complexes were regioselectively synthesized in good yields. The absorption and luminescence spectra indicated that the emission exhibited in the range 411-415 nm depends on the nature of the acetylide ligand bound to platinum.