Competing hydrogen-bond acceptors in ethylenediammonium oxotrithiotungstate(VI).

The structure of the title compound, (C(2)H(10)N(2))[WOS(3)], consists of ethylenediammonium dications and tetrahedral [WOS(3)](2-) dianions, which are linked with the aid of four varieties of hydrogen bond, namely N-H...O, N-H...S, C-H...O and C-H...S. The strength and number of these hydrogen bonds affect the W-O and W-S bond distances.

Bis(isopropyl-ammonium) tetra-sulfido-molybdate(VI).

The title compound, (C(3)H(10)N)(2)[MoS(4)], was synthesized by passing a rapid stream of H(2)S into an aqueous isopropyl-amine solution of molybdic acid. The title compound is isotypic with the corresponding W analogue (C(3)H(10)N)(2)[WS(4)]; its structure consists of a slightly distorted tetra-hedral [MoS(4)](2-) dianion and two crystallographically independent isopropyl-ammonium cations, with all atoms located in general positions. The cations and anion are linked by weak N-H⋯S and C-H⋯S inter-actions, the strength and number of which can explain the observed Mo-S bond distances.