Structures of zinc(II) with tetradentate N2S2 ligation

trans-3,3'-(1,2-Cyclohexanediyldinitrilo)-bis(2-methylpropane++ +-2-thiolato )]zinc(II), [Zn(C14H28-N2S2)], Zn(2), Mr = 353.89, monoclinic, C2/c, a = 17.914 (4), b = 9.440 (1), c = 10.877 (2) A, beta = 110.19 (2)degrees, V = 1726 (1) A3, Z = 4, Dm = 1.35 (1), Dx = 1.360 Mg m-3, mu(Mo K alpha, lambda = 0.71073 A) = 0.17 mm-1, F(000) = 752, T = 298 (1) K, RF = 0.026, wRF = 0.037 for 1290 reflections. 3,3'-(1,2-Cyclohexa-1,4- dienediyldinitrilo)bis(2-methylpropane-2-thiolato)] zin c(II), [Zn(C14H24N2S2)], Zn(3), Mr = 349.86, monoclinic, P2(1)/c, a = 9.760 (2), b = 17.326 (3), c = 10.530 (2) A, beta 91.49 (2)degrees, V = 1780 (1) A3, Z = 4, Dm = 1.31 (1), Dx = 1.305 Mg m-3, mu(Mo K alpha, lambda = 0.71073 A) = 0.16 mm-1, F(000) = 736, T = 297 (1) K, RF = 0.050, wRF = 0.062 for 1723 reflections. The structures consist of discrete complexes with distorted-tetrahedral ZnS2(thiolate)N2(amine) coordination geometries. Zn--S [2.2533 (6) A for Zn(2); 2.259 (1), 2.253 (1) A for Zn(3)] and Zn--N [2.101 (2) A for Zn(2); 2.088 (4), 2.128 (4) A for Zn(3)] distances are close to those reported for similar structures with bidentate N(amine)S(thiolate) ligands. The N,S chelate rings in both structures exhibit the envelope conformation with the tetrasubstituted C atoms comprising the flaps. In Zn(3), the central N,N chelate ring adopts the envelope conformation, while in Zn(2), the corresponding ring is gauche.(ABSTRACT TRUNCATED AT 250 WORDS)