Patent ID: 7618841

Claim:
A process for preparing an isolated hydrazinium-based precursor of a metal chalcogenide which comprises: contacting: at least one metal chalcogenide, a hydrazine compound represented by the formula: R 1 R 2 N—NR 3 R 4 wherein each of R 1 , R 2 , R 3 and R 4 is independently selected from the group consisting of: hydrogen, aryl, methyl, ethyl and a linear, branched or cyclic alkyl of 3-6 carbon atoms, and optionally an elemental chalcogen selected from the group consisting of: S, Se, Te and a combination thereof, to produce a solution of a hydrazinium-based precursor of said metal chalcogenide in said hydrazine compound; and isolating hydrazinium-based precursor of said metal chalcogenide as a substantially pure product.