2-Aminobenzothiazole-based Cd^II complexes incorporating carboxylate-containing coligand: synthesis, crystal structure, and fluorescences

Abstract

Abstract Four new 2-aminobenzothiazole (abt)-based CdII complexes, {[Cd(abt)2(chdc)][Cd(abt)2(chdc)] · 2H2O · CH3OH} n (1), [Cd2(abt)4(bd)2(H2O)2] · 2H2O (2), [Cd(abt)2(o-mb)2] (3), and [Cd(abt)2(m-mb)2] (4) (chdc = cis-1,4-cyclohexanedicarboxylate, bd = cis-butenedicarboxylate, o-mb = o-methylbenzoate, and m-mb = m-methylbenzoate), were obtained by the reaction of CdII with abt ligand in the presence of different carboxylate-containing coligands. As a result of the different number of carboxylate groups appended on the coligands, the complexes exhibit H-bonded supramolecular assemblies consisting of polymeric 1-D array and separate binuclear entity for 1, a centrosymmetric binuclear structure for 2 as well as discrete mononuclear entities for 3 and 4, which are further packed into 2-D supramolecular networks by hydrogen-bonding and/or π–π stacking interactions. The four complexes with comparable thermal stability display intense abt-based emissions, suggesting their potential applications as fluorescent materials. Keywords: 2-AminobenzothiazoleCrystal structureThermal stabilityFluorescent Acknowledgments This work was financially supported by the National Natural Science Foundation of China (20871092, 20973125, 21171129, and 21173157), the Program for New Century Excellent Talents in University (NCET-08-0914), which are gratefully acknowledged.