Issue 4, 2012

Two novel 2D cadmium(ii) MOFs based on flexible bis(imidazolyl) and zwitterionic dicarboxylate ligands

Abstract

The reaction of 1,4-bis((pyridinium-4-carboxylic acid)methyl)benzene dibromide (Bpmb-2HBr), Cd(NO3)2·4H2O with 1,2-bis(imidazol-1′-yl)ethane (Bime) and 1,4-bis(imidazol-1′-yl)butane (Bimb) gave rise to two novel 2D Cd(II) coordination polymers, [Cd1.5(Bime)(Bpmb)0.5(μ-Br)Br2·DMF]n (1) and [Cd2(Bimb)2(μ-Br)2Br2]n (2), respectively, in which coordination of μ-Br and monodentate Br with Cd(II) generates an unprecedented trimeric [Cd3(μ-Br)2Br4] unit in 1 and a dimeric [Cd2(μ-Br)2Br2] unit in 2. In 1, gauche-Bime links the central six-coordinated Cd(II) of the trimers into a 1D double chain, anti-Bpmb further bridges the terminal four-coordinated Cd(II) of the trimers in the opposite direction to generate a 2D layer. Complex 2 is a 2D corrugated layer consisting of perpendicular left- and right-handed helical chains constructed through anti-anti-gauche-conformated Bimb bridging the neighboring six-coordinated Cd(II) of [Cd2(μ-Br)2Br2] units. The thermal stability and fluorescent properties of the two complexes have also been studied.

Graphical abstract: Two novel 2D cadmium(ii) MOFs based on flexible bis(imidazolyl) and zwitterionic dicarboxylate ligands

Supplementary files

Article information

Article type
Paper
Submitted
16 Sep 2011
Accepted
02 Nov 2011
First published
08 Dec 2011

CrystEngComm, 2012,14, 1412-1418

Two novel 2D cadmium(II) MOFs based on flexible bis(imidazolyl) and zwitterionic dicarboxylate ligands

X. Li, X. Guo, X. Weng and S. Lin, CrystEngComm, 2012, 14, 1412 DOI: 10.1039/C1CE06216F

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