A decanuclear oxomolybdenum(V,VI) cluster with 4-isopropylpyridine.

The title centrosymmetric cluster octakis(4-isopropylpyridine-N)-di-mu(4)-oxo-hexa-mu(3)-oxo-octa-mu(2)-oxo-decaoxooctamolybdenum(V)dimolybdenum(VI), [Mo(10)O(26)(C(8)H(11)N)(8)], consists of ten Mo atoms connected together by bridging oxo groups. Pentavalent Mo atoms are linked into four [Mo(2)](V) pairs by metal--metal single bonds with lengths of 2.5637 (6) and 2.