Some thio-ether-ketones and their related derivatives.

Structural characteristics are reported for two thio-ether-ketones, Dtdpe and Mtdp [2-({2-[(2-oxo-2-phenyl-eth-yl)sulfan-yl]eth-yl}sulfan-yl)-1-phenyl-ethan-1-one, C(18)H(18)O(2)S(2), and 2-[(2-oxo-2-phenyl-eth-yl)sulfan-yl]-1-phenyl-ethan-1-one, C(16)H(14)O(2)S], and for related derivatives, the bis-(pyridyl-hydrazones) Dhpk and Prpsb [2-((2E)-2-{(2Z)-2-phenyl-2-[2-(pyridin-2-yl)hydrazin-1-yl-idene]ethyl-idene}hydrazin-1-yl)pyridine, C(18)H(16)N(6), and 2-[(2Z,12Z)-3,12-diphenyl-14-(pyridin-2-yl)-5,10-di-thia-1,2,13,14-tetra-aza-tetra-deca-2,12-dien-1-yl]pyridine, C(30)H(32)N(6)S(2)], as well as for the macrocyclic thio-carbohydrazide derivative Ctrsp [(3E,8Z)-3,9-dimethyl-1,11-di-thia-4,5,7,8-tetra-aza-cyclo-tetra-deca-3,8-diene-6-thione, C(10)H(18)N(4)S(3)]. Three of the five compounds exhibit conformational enanti-omerism in the solid state. The occurrence of intra- and inter-molecular hydrogen bonding is commented upon through quantum mechanical (DFT) calculations. Weak C-H⋯S inter-actions are noted, while stronger N-H⋯N and N-H⋯S hydrogen bridges are delineated.