Synthesis, crystal structure and properties of [(dien)2Mn]Ge2S4 with mixed-valent Ge centers

One new manganese thiogermanate, [(dien) 2 Mn]Ge 2 S 4 (dien=diethylenetriamine), was prepared under mild solvothermal conditions and structurally and spectroscopically characterized. The title compound crystallizes in the orthorhombic system, chiral space group P 2 1 2 1 2 1 (no. 19) with a =9.113(4) A, b =12.475(5) A, c =17.077(7) A, V =1941.5(15) A 3 and Z =4. Its structure features a three-dimensional (3D) network composed of a one-dimensional (1D) [Ge 2 S 4 ] 2− anionic chain and a [(dien) 2 Mn] 2+ complex interconnected via various hydrogen bonds. The most interesting structural feature of the compound is the presence of two different oxidation states of germanium centers in the 1D [Ge 2 S 4 ] 2− chain, which is also supported by the result of X-ray photoelectron spectroscopy measurement. The optical property of the title compound has also been studied by UV–vis spectra.