Synthesis and structure of a high-nuclearity oxomolybdenum(V) complex, [Mo12O28(OC2H5)4(C6H7N)8]

(PyH)[MoOBr4(H2O)]·2/3PyHBr (PyH+=pyridinium cation, C5H5NH+) yielded upon the solvothermal reaction with ethanol and 4-methylpyridine (4-MePy, C6H7N) a novel oxoethoxomolybdenum(V) cluster, [Mo12O28(OC2H5)4(4-MePy)8] 1. Molybdenum atoms are grouped into six MoV2 pairs linked by single metal–metal bonds. Three crystallographically independent Mo–Mo distances are 2.5578(14), 2.5981(14) and 2.6489(16) Å.