Sarma, Debajit ; Ramanujachary, K. V. ; Lofland, S. E. ; Magdaleno, Travis ; Natarajan, Srinivasan (2009) Amino acid based MOFs: synthesis, structure, single crystal to single crystal transformation, magnetic and related studies in a family of cobalt and nickel aminoisophthales Inorganic Chemistry, 48 (24). pp. 11660-11676. ISSN 0020-1669
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Official URL: http://pubs.acs.org/doi/abs/10.1021/ic901678c
Related URL: http://dx.doi.org/10.1021/ic901678c
Abstract
Four new 5-aminoisophthalates of cobalt and nickel have been prepared employing hydro/solvothermal methods: [Co2(C8H5NO4)2 (C4H4N2)(H2O)2]·3H2O (I), [Ni2(C8H5NO4)2 (C4H4N2)(H2O)2]·3H2O (II), [Co2(H2O)(μ3-OH)2 (C8H5NO4)] (III), and [Ni2(H2O) (μ3-OH)2(C8H5NO4)] (IV). Compounds I and II are isostructural, having anion-deficient CdCl2 related layers bridged by a pyrazine ligand, giving rise to a bilayer arrangement. Compounds III and IV have one-dimensional M-O(H)-M chains connected by the 5-aminoisophthalate units forming a three-dimensional structure. The coordinated as well as the lattice water molecules of I and II could be removed and inserted by simple heating-cooling cycles under the atmospheric conditions. The removal of the coordinated water molecule is accompanied by changes in the coordination environment around the M2+ (M = Co, Ni) and color of the samples (purple to blue, Co; green to dark yellow, Ni). This change has been examined by a variety of techniques that include in situ single crystal to single crystal transformation studies and in situ IR and UV-vis spectroscopic studies. Magnetic studies indicate antiferromagnetic behavior in I and II, a field-induced magnetism in III, and a canted antiferromagnetic behavior in IV.
Item Type: | Article |
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Source: | Copyright of this article belongs to American Chemical Society. |
ID Code: | 27763 |
Deposited On: | 11 Dec 2010 07:57 |
Last Modified: | 04 Mar 2011 05:59 |
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