Syntheses, structures, and properties of multidimensional lithium coordination polymers based on aliphatic carboxylic acids.

Three lithium coordination polymers, [Li4(H2O)2(EDTA)] (1), [Li4(H2O)4(BTCA)] (2), and (H2NMe2)2[Li2(H2O)2(BTCA)] (3) (H4EDTA = ethylenediaminetetraacetic acid, H4BTCA = 1,2,3,4-butane tetracarboxylic acid, H2NMe2 = dimethyl amine), have been synthesized by reacting lithium salts with aliphatic carboxylic acids using a solvothermal method. The structures of all the three complexes have been determined by single crystal X-ray diffraction studies. The single crystal structure analysis revealed that complex 1 has a three-dimensional framework, whereas complex 2 has 2D sheets and complex 3 has 1D chains. In addition, these lithium complexes contain various inorganic motifs with a tetramer in 1 and 2, and discrete tetrahedra in 3 and have further been connected through organic ligands to construct multidimensional structures. Further, the electrochemical properties of complexes 1­3 have been studied to evaluate these compounds as electrode materials for lithium ion batteries with discharge capacities of around 100 mA h g(-1) in the first thirty cycles.

Poly[bis-(µ(2)-4,4'-bipyridine)-bis-(3-nitro-benzoato)nickel(II)].

The crystal structure of the title complex, [Ni(C(7)H(4)NO(4))(2)(C(10)H(8)N(2))(2)](n), exhibits a two-dimensional network, which is built up from slightly distorted NiN(4)O(2) polyhedra (2 symmetry), bipyridine ligands, and carboxyl-ate anions. The Ni(II) atoms are six-coordinated by two O atoms of two monodentate carboxyl-ate anions and four N atoms from bipyridine ligands and are connected into layers by the 4,4'-bipyridine ligands.

Poly[[aqua-calcium(II)]-µ(4)-1H-imidazole-4,5-dicarboxyl-ato].

In the title compound, [Ca(C(5)H(2)N(2)O(4))(H(2)O)](n), the Ca(2+) cations are eigthtfold coordinated by six O atoms and one N atom of four symmetry-related anions and one water mol-ecule within an irregular polyhedron. These CaO(7)N polyhedra are connected via the anions into a three-dimensional network. The anions are additionally linked by N-H⋯O and O-H⋯O hydrogen bonding.