X-RAY-DIFFRACTION STUDIES ON THE STRUCTURE OF THE TRIATHIOCYANATOMANGANAGE(II) AND TETRATHIOCYANATOMANGANATE(II) COMPLEXES AND SOLVATED LITHIUM ION IN N,N-DIMETHYLFORMAMIDE

The structure of the tri- and tetrathiocyanato-N-manganate(II) complexes in N,N-dimethylformamide (DMF) solution was determined by the solution X-ray diffraction method at 25-degrees-C. The most probable structure of the tri-complex is octahedral with additional three DMF molecules in the first coordination sphere, while the tetra-complex is tetrahedral. The Mn-O and Mn-N bond lengths were determined to be 220 pm in both complexes. The structure of the octahedrally solvated lithium ion [Li(dmf)6]+ with the Li-O bond length of 195 ppm was also determined in an LiSCN solution of DMF.