Crystal structures and visible-light excited photoluminescence of N-methyl-4,4′-bipyridinium chloride and its Zn(II) and Cd(II) complexes
摘要:
A new approach has been used to synthesize MQ(+) ligand (MQ(+) = N-methyl-4,4'-bipyridinium) by the reaction of 4,4'-bipyridine and chloroacetic acid, and the structure of (MQ)Cl center dot H2O (1) was first determined. Three new complexes containing MQ(+), (MQ)CdI3 (2). (MQ)ZnI3 (3), and [(MQ)znCl(1.53)I(1.47)](2)(MQ) ZnCl1.68I1.32 (4). were successfully obtained via a solution or hydrothermal method by reaction of MI2 (M = Cd, Zn) with 1, and each of which exhibits an isolated structure, with each metal atom coordinated by one MQ ligand and three terminal halogen atoms. Compounds 1-4 all display photoluminescence in the visible region under visible-light excitation, and the origins of the emissions have been assigned to ILCT for 1 and the combination of ILCT and LLCT for 2-4. (C) 2010 Elsevier B.V. All rights reserved.