Molecular and intracomplex dioxomolybdenum(VI) compounds with o-hydroxyazomethines, derivatives of salicylaldehydes and 2-furfurylamine: Crystal structures of 3-methoxysalicylidene-2-furfurylamine (HL2) and the binuclear complex [MoO2(L2)(MeOH)2(μ-O)]

The crystal structures of methoxysalicylidene-2-furfurylamine (HL2) and the related binuclear complex [{MoO2(L2)(MeOH)}2(μ-O)] (I) have been determined by single-crystal X-ray diffraction. In complex I, which lies on a crystallographic twofold axis passing through the bridging oxo ligand O(4), the Mo atom has a distorted octahedral coordination (facial isomer) with two terminal oxygen atoms (O(3), O(6)) and the bridging oxo ligand, the O(7) and N(1) atoms of the bidentate chelating ligand (L2)–, and the O(5) atom of the monodentate methoxy ligand. In the HL2 molecule, the intramolecular hydrogen bond O–Н•••N closes the six-membered H-ring HOC3N.