Deep-Red Luminescent Cuprous-Lead Bromide as a Dual-Responsive Sensor for Fe 3+ and Cr 2 O 7 2 .

Both optically active 1-tetrazole-4-imidazole-benzene (TIB) with bifunctional azole groups and heterometals were utilized to build a new type of one-dimensional (1-D) hybrid cuprous-lead bromide [PbCu 2 Br 4 (TIB) 2 ] n ( 1 ), which exhibits infrequent deep-red luminescent emission at 704 nm with a large Stokes shift of 321 nm. Owing to the existence of rare free Lewis basic imidazole groups, 1 can be used as the sole dual-responsive luminescent sensor for the efficient and selective detection of Fe 3+ and Cr 2 O 7 2- in an aqueous solution.