Inorganic Chemistry, Vol.44, No.12, 4151-4153, 2005
Exploratory synthesis in molten salts: Role of flux basicity in the stabilization of the complex thiogermanates Cs4Pb4Ge5S16, K2PbGe2S6, and K4Sn3Ge3S14
The influence of the Lewis basicity of alkali polysulfide fluxes (A(2)S(x)) (A = alkali) as a function of x on the respective reactivities of Pb and Sn with Ge was studied and found to be strong. Cs4Pb4Ge5S16, K2PbGe2S6, and K4Sn3Ge3S14 could be prepared only under low basicity with S/A(2)S ratios of >= 11. These compounds display complex frameworks and are semiconductors. CS4Pb4Ge5S16 is luminescent with red emission.