Molecular heterometallic clusters [Re6−xMoxS8L6] (x = 2–3, L = py, etpy, tbp): negligible influence of the x value on the crystal structures

Abstract

The influence of the metal ratio on the geometric characteristics and crystal structures of heterometallic clusters with {Re_6−xMo_xQ₈} cores was studied. For this purpose, nine new molecular cluster complexes of the type [Re_6−xMo_xS₈L₆] (x = 2, 3 or non-integer value between 2 and 3; L = pyridine, 4-ethylpyridine or 4-tert-butylpyridine) were synthesized. The compounds were obtained by one-step replacement of the cyanide apical ligands of [Re_6−xMo_xS₈(CN)₆]^5−/4− cluster complexes with the corresponding organic compounds under solvothermal conditions. The crystal structures of all the obtained compounds were investigated by single-crystal X-ray diffraction analysis. Analysis of the crystal structures showed that clusters with the same apical ligands and different x values have similar geometries and form isostructural packings, demonstrating the formation of solid solutions.