Synthesis Structure and Photoluminescence of 1,2‐Disila‐acenaphthene Si²C¹⁰H¹⁰ and 1,2‐Diaryldisilane Reference Compounds

Abstract

Abstract For the synthesis of the diaryldisilanes Ar–SiH 2 SiH 2 –Ar ( 1a , Ar = phenyl; 1b , Ar = p ‐tolyl 1c , Ar = mesityl; 1d , Ar = p ‐anisyl) two convenient preparative routes are reported. The crystal structures of 1c and 1d have been determined in X‐ray diffraction studies; the disilanes have a staggered transconformation with a crystallographically imposed center of inversion. For 1a–d no photoluminescence phenomena can be observed. 1,2‐Disila‐acenaphthene ( 2 ) is synthesized in acceptable yield by treatment of 1,8‐dilithionaphthalene with 1 equivalent of 1,2‐bis[((trifluoromethyl)sulfonyl)oxy]disilane Tf–SiH 2 SiH 2 –Tf. The crystal structure of 2 has been determined by X‐ray diffraction. The molecule has no crystallographically imposed symmetry but closely follows the symmetry elements of points group C 2v . Solutions of 2 exhibit intense fluorescence in the near UV region at room temperature. The fluorescence spectra are discussed in comparison with data on acenaphthene and naphthalene.