Issue 3, 2015

1D chains, 2D networks and 3D interdigitated frameworks of isoorotic acid or 4,4′-bipyridyl and isoorotic acid: syntheses, structures, and sorption properties

Abstract

Five new coordination polymers, {[Cu(H2iso)2]·2H2O}n (1), {Mn(Hiso)(H2O)3}n (2), {Mn(Hiso)(H2O)2}n (3), {[Cu(Hiso)(4,4′-bipy)(H2O)]·2H2O}n (4) and {[Ni(Hiso)(4,4′-bipy)(H2O)}]·0.5(4,4′-bipy)}n (5) (H3iso = 2,4-dihydroxypyrimidine-5-carboxylic acid or isoorotic acid; 4,4′-bipy = 4,4′-bipyridyl), have been synthesized using hydrothermal as well as room temperature solvent diffusion techniques and structurally characterized. Compounds 1 and 2 are 1D coordination polymers which are further connected by O–H⋯N, O–H⋯O hydrogen bonding interactions forming 3D supramolecular frameworks. Compound 3 is a 2D coordination polymer where 1D chains of {Mn(Hiso)(H2O)2} are linked by an oxo (μ2-O) bridge. Compound 4 consists of isoorotic acid and 4,4′-bipy, a mixed linker system. It forms a 2D sheet like extended structure and these sheets stack on each other to give a 3D supramolecular porous structure. In case of 5, Ni(Hiso) 1D chains are bridged by 4,4′-bipy forming a 2D network and networks are further interdigitated through hydrogen bonding interactions resulting in a 3D supramolecular framework with a 1D channel where 4,4′-bipy molecules are accommodated as guests. Compound 5 undergoes a structural contraction after the removal of the guest 4,4′-bipy and metal bound water molecules and shows a non-porous behaviour toward N2 at 77 K. However, at 195 K, it shows a stepwise uptake for both CO2 and C2H2, suggesting the flexible nature and polar pore surface of the framework.

Graphical abstract: 1D chains, 2D networks and 3D interdigitated frameworks of isoorotic acid or 4,4′-bipyridyl and isoorotic acid: syntheses, structures, and sorption properties

Associated articles

Supplementary files

Article information

Article type
Research Article
Submitted
03 sep 2014
Accepted
14 jan 2015
First published
14 jan 2015

Inorg. Chem. Front., 2015,2, 278-289

1D chains, 2D networks and 3D interdigitated frameworks of isoorotic acid or 4,4′-bipyridyl and isoorotic acid: syntheses, structures, and sorption properties

R. Haldar, K. L. Gurunatha, N. Sikdar and T. K. Maji, Inorg. Chem. Front., 2015, 2, 278 DOI: 10.1039/C4QI00129J

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