Synthesis, crystal structure, and properties of 1,1,3,3,3-pentaamino-1-thio-1 lambda(5),3 lambda(5)-diphosphaz-2-ene (NH2)(2)P(S)N=P(NH2)(3)

(NH2)(2)P(S)N=P(NH2)(3) has been prepared by a two step synthesis. Suitable single crystals were obtained from an acetonitrile solution in a temperature gradient between 60 degrees C and room temperature. The crystal structure of (NH2)(2)P(S)N=P(NH2)(3) has been determined by single crystal X-ray methods (P2(1)/c, a = 998.27(9), b = 762.78(8), c = 1007.70(15) pm, beta = 107.340(7)degrees, Z = 4). In the crystal structure each hydrogen atom is subject to a hydrogen bond. Four N-H ... N hydrogen bonding interactions per molecule build up a framework connecting two molecules in eight-membered rings. Each sulfur atom shows six distances N-H ... S in the range of weak hydrogen bonding interactions.