Issue 22, 2016

Dynamic metal–organic frameworks: syntheses, characterizations, sorption studies and their hydrolytic inter-conversion

Abstract

Two metal–organic frameworks of Cd(II) from 3,4-pyridinedicarboxylate (3,4-pyrdc) and 1,2-bis(4-pyridyl)ethane (bpe) ligands, {[Cd(3,4-pyrdc)(bpe)(CH3OH)]·(H2O)}n (1) and {[Cd(3,4-pyrdc)(bpe)0.5(H2O)]·(H2O)}n (2) have been synthesized by changing the reaction medium. Compound 1 exhibited a 2D structure while compound 2 showed a 3D structure, which have both been revealed by single crystal X-ray studies. Both of the compounds showed interesting solvent mediated reversible structural transformations which have been established by exhaustive X-ray powder diffraction studies, elemental analysis, IR spectroscopy and thermogravimetric analysis. The desolvated form of the 2D framework (1) undergoes an irreversible structural transformation to form the 3D framework (2) upon soaking with water. The 2D to 3D transformation occurs through precise bond rotation and bond breaking which has been established by a GC–MS study. Sorption experiments with different gases and volatiles were performed for both the metal–organic frameworks and clearly indicated the differences in their inherent flexibility and transformability.

Graphical abstract: Dynamic metal–organic frameworks: syntheses, characterizations, sorption studies and their hydrolytic inter-conversion

Supplementary files

Article information

Article type
Paper
Submitted
05 Oct 2015
Accepted
12 Nov 2015
First published
13 Nov 2015

CrystEngComm, 2016,18, 4074-4083

Dynamic metal–organic frameworks: syntheses, characterizations, sorption studies and their hydrolytic inter-conversion

B. Bhattacharya, A. Halder, D. K. Maity and D. Ghoshal, CrystEngComm, 2016, 18, 4074 DOI: 10.1039/C5CE01952D

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