Mechanochromic photoluminescence in a dinuclear alkynyl copper(i) complex with an extremely short Cu(i)⋯Cu(i) separation

Abstract

We report the synthesis and luminescent properties of a rare copper(I) alkynyl complex assembled from the diphosphane bis-diphenyphosphinobenzene (dppb) and phenylacetylide ligands with an extremely short Cu(I)⋯Cu(I) separation. The complex shows long-lived mechanochromic phosphorescence with high quantum yield in the solid state and in frozen solution.