Abstract
The title coordination polymer, {[Co2(C12H7NO8)(H2O)6]·5H2O} n , was crystallized at room temperature from an aqueous solution of 2-aminodi-acetic terephthalic acid (H4adtp) and cobalt(II) nitrate. The asymmetric unit consists of one adtp4- ligand, one and two half CoII ions, six water ligands coordinated to CoII ions and five uncoordinated water mol-ecules. Two of the cobalt cations lie on centres of inversion and are coordinated in octa-hedral O2(OH2)4 environments, whereas the other adopts a slightly distorted octa-hedral NO3(OH2)2 environment. The crystal structure contains parallel stacked, one-dimensional zigzag chains, {[Co2(C12H7NO8)(H2O)6]} n , which assemble into a three-dimensional supra-molecular architecture via networks of hydrogen bonds involving the coordinated and free water mol-ecules. One-dimensional 'water tapes' are formed, containing alternating six-membered and twelve-membered rings of water mol-ecules, together with water penta-mers, in which a central uncoordinated water mol-ecule is hydrogen bonded to two coordinated and two free water mol-ecules in a tetra-hedral arrangement.
Highlights
The title coordination polymer, {[Co2(C12H7NO8)(H2O)6]Á5H2O}n, was crystallized at room temperature from an aqueous solution of 2-aminodiacetic terephthalic acid (H4adtp) and cobalt(II) nitrate
The asymmetric unit consists of one adtp4À ligand, one and two half CoII ions, six water ligands coordinated to CoII ions and five uncoordinated water molecules
Water clusters, which are aggregations of water molecules assembled via hydrogen bonding, are often observed in organic and organic–inorganic hybrid crystal structures
Summary
Water clusters, which are aggregations of water molecules assembled via hydrogen bonding, are often observed in organic and organic–inorganic hybrid crystal structures. Water clusters, when hydrogen bonded to the host structures, play a vital role in assembling organic and organic–inorganic complex molecules into threedimensional architectures We have previously reported the synthesis of two CuII complexes based on 2-(carboxyphenyl)-iminodiacetic acid (H3cpida) and 1,10phenanthroline (phen), and discussed the influence of hydrogen bonding on the resulting structures (Ma et al, 2015b). We report the synthesis and structural characterization of a CoII coordination polymer, {[Co2(C12H7NO8)(H2O)6]Á5H2O}n (I), based on 2-aminodiacetic terephthalic acid (H4adtp). Symmetry codes: (i) Àx þ 2; Ày þ 1; Àz þ 1; (ii) Àx þ 2; Ày þ 2; Àz þ 1; (iii) Àx þ 2; Ày þ 2; Àz; (iv) Àx þ 1; Ày þ 1; Àz þ 1; (v) Àx þ 1; Ày; Àz þ 2; (vi) x; y; z þ 1; (vii) x À 1; y; z; (viii) Àx þ 1; Ày þ 2; Àz þ 1; (ix) x; y À 1; z þ 1; (x) x À 1; y; z þ 1; (xi) x þ 1; y; z
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