Synthesis and crystal structures of four nickel(II) 1,5-naphthalenedisulfonate compounds

Four nickle(II) 1,5-naphthalenedisulfonate (1,5nds) complexes, namely [Ni(H2O)(6)] (1,5nds) (1). trans-[Ni(en)(2)(H2O)(2)](1,5nds).2H(2)O (2), [Ni(tren)(H2O)(2)](1,5nds).H2O (3), and [Ni(dien)(2)](l,5nds).2H(2)O (4), where en = ethylenediamine, tren = tris(2-aminoethyl)amine, and then = diethylenetriamine, have been synthesized and structurally characterized. Compound I crystallizes in space group P2(1)/c, with a = 13.200(2) Angstrom, b = 6.6197(10) Angstrom, c = 9.6001(14) Angstrom, and beta = 92.005(3)degrees; compound 2 crystallizes in space group C2/c, with a = 15.698(2) Angstrom, b = 13.006(2) Angstrom, c = 12.845(2) Angstrom, and beta = 119.262(4) Angstrom; compound 3 crystallizes in space group P (1) over bar, with a = 8.8971(10) Angstrom, b = 11.5440(13) Angstrom, c = 11.9169(14) Angstrom, alpha = 77.254(2)degrees, beta = 74.079(2)degrees, and gamma = 82.162(2)degrees; compound 4 crystallizes in space group P2(1)/c, with a = 10.3600(13) Angstrom, b = 12.5650(16) Angstrom, c = 9.9853(12) Angstrom, and beta = 103.599(2)degrees. Compound 1 crystallizes in a typical inorganic-organic layered structure adopted by metal naphthalenesulfonate, while compounds 2-4 crystallize in a hybrid inorganic-organic pattern. Unlike their Cu2+ analogue. the sulfonate does not coordinate directly to Ni2+. The hydrogen bonds formed between sulfonate and water molecules are the predominant packing forces for all structures. The inherited inversion center of the 1,5nds anion is carried into the crystal structure and results in centrosymmetric crystallization of all compounds.