pi-Conjugation between a Si=Si Double Bond and Thiophene Rings: Synthesis, Structural Characteristics, and Photophysical Properties of 1,2-Bis(thiophen-2-yl)disilene and 1,2-Bis(2,2'-bithiophen-5-yI)disilene

摘要

The two new disilene compounds, 1,2-bis-(thiophen-2-yl)disilene (1) and 1,2-bis(2,2'-bithiophen-5-yl)disilene (2), supported by the fused-ring bulky Eind groups (Eind = 1,1,3,3,5,S,7,7-octaethyl-s-hydrindacen-4-yl) have been obtained as orange and purple crystals, respectively, by the reduction of the corresponding dibromosilanes. Their X-ray structures and spectroscopic properties demonstrate the effective pi-conjugation between a Si=Si double bond and thiophene units. Notably, the pi-extended 2 exhibits a distinct emission both in solution and in the solid state at room temperature based on the essentially coplanar 1,2-bis-(bithienyl)disilene skeleton. The structural features and electronic properties of 1 and 2 have been thoroughly characterized both experimentally and computationally.