Syntheses and structures of trans-di-aqua-bis(propane-1,3-di-amine-κ2 N,N')nickel(II) salts of two isomeric naphthalene-disulfonates.

Abstract

Aqueous reactions of nickel(II) nitrate, propane-1,3-di-amine, and either naphthalene-1,5-di-sulfonic acid or disodium naphthalene-2,6-di-sulfonate produced crystals of trans-di-aqua-bis-(propane-1,3-di-amine-κ2 N,N')nickel(II) naphthalene-1,5-di-sulfonate, (I), and trans-di-aqua-bis-(propane-1,3-di-amine-κ2 N,N')nickel(II) naphthalene-2,6-di-sulfonate, (II), both [Ni(C3H10N2)2(H2O)2](C10H6O6S2), in high yields. (I) crystallizes in the monoclinic space group P21/c while (II) crystallizes in the triclinic space group P1. In both structures, the cation and anion rest on centers of inversion. The nickel cations display trans octa-hedral coordination of two water mol-ecules and two bidentate propane-1,3-di-amine mol-ecules with Ni-O/N bond distances in the ranges 2.0960 (9)-2.1205 (7) Å (I) and 2.1110 (7)-2.1181 (9) Å (II). The packing in both structures features alternating layers of complex cations and naphthalene-disulfonate anions held together by O-H⋯O and N-H⋯O hydrogen bonds between the water and amine groups of the ligands and the sulfonate groups of the anions. These are the first metal salts of naphthalene-1,5-di-sulfonate and naphthalene-2,6-di-sulfonate that contain propane-1,3-di-amine. The packing in (I) and (II) is compared to each other and to those found in other nickel salts of the anions.

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