A new six-co-ordinate cis-dioxomolybdenum(VI) complex [Mo(O)2 (3,5-di-tert-Busap) (EtOH)], (where 3,5-di-tert-Busap2- = the Schiff base dianion 3,5-di-tert-butyl-N-salicylidene-2-aminophenolate), has been prepared. The complex is characterised by IR, 1H and 13C NMR and UV/vis spectroscopy and is stable to air, but above 413 K or in non-co-ordinating solvents loses an ethanol molecule, forming an dimeric compound with an unsymmetrical dioxygen bridge as indicated by IR spectroscopy.
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