Poly[[diaqua(μ₃-3-nitrophthalato)calcium(II)] monohydrate]

Abstract

The title 3-nitrophthalate-calcium coordination polymer, {[Ca(C8H3NO6)(H2O)2].H2O}n, crystallizes as a one-dimensional framework. The Ca(II) centre has a distorted pentagonal-bipyramidal geometry, being seven-coordinated by five O atoms from three different 3-nitrophthalate groups and by two water molecules, resulting in a one-dimensional zigzag chain along the a-axis direction by the interconnection of the four O atoms from the two carboxylate groups. There is a D3 water cluster composed of the coordinated and the solvent water molecules within such chains. Adjacent chains are aggregated into two-dimensional layers via hydrogen bonds in the c-axis direction. The whole three-dimensional structure is further stabilized by weak O-H...O hydrogen bonds between the O atoms of the nitro group and the water molecules.

Poly[diaquabis(μ3-2,2-dimethylpropanedioato)calcium(II)copper(II)]

“…An important objective in crystal engineering is the control of the assembly of donor and acceptor building blocks in order to tune the properties of metal-organic frameworks (Burrows et al, 2000;Guo, 2009). Recent developments have demonstrated that suitable chelating ligands can facilitate the generation of particularly robust coordination complexes with free hydrogen-bonding positions, which can provide effective building blocks for the construction of hydrogen-bonded networks (Zhao et al, 2007).…”

“…For dimethylmalonate, however, in spite of this wealth of possibilities, no complexes of heterobimetallic systems have been reported to date. Using dimethylmalonic acid in an attempt to obtain structures with heterobimetallic complexes involving transition and alkaline earth metals, we have previously found an unusual five-coordinated dimethylmalonate zinc complex (Guo & Zhao, 2006) and an eightcoordinated dimethylmalonate cadmium complex with an extended sodalite-type water structure (Guo & Guo, 2009). Now, we have obtained the title heterobimetallic compound, (I), with a robust dianionic [Cu(C 5 H 6 O 4 ) 2 ] 2À complex that provides an effective building block for the construction of a heterobimetallic metal-organic framework, and we report its crystal structure here.…”

Preparation, Crystal Structures, and Thermal Studies of Alkaline Earth Nitrocarboxylates

“…In the present work, we have investigated the reactions of MCO 3 (M = Mg, Ca) with 3-nitrophthalic acid (3-npthH 2 2 ] (4) (2-nba = 2-nitrobenzoate). A report on the structure of the polymeric Ca II compound based on 3-nitrophthalate 2 has recently appeared [28]. In recent work [22,23] we have demonstrated that a zero-dimensional compound [Ca(H 2 O) 4 (4-nba) 2 ] can be readily transformed into a one-di-Scheme 1.…”