Oxo- and alkoxo-bridged dimeric molybdenum(III) ethylenediamine complexes

Oxo- and alkoxo-bridged dimeric molybdenum(III) ethylenediamine complexes, [Mo-2(mu -O)(mu -R)(en)(4)](3+) (R = OMe (3); R = OEt (4)) were synthesized from the mononuclear complex [MoCl3(thf)(3)], and were characterized struc turally, spectroscopically, and electrochemically, where the methoxy- and e thoxy-bridges were introduced by using methanol and ethanol as the solvent, respectively. The electronic spectra of 3 and 4 have characteristic peaks in visible and near infrared region, and the addition of acid causes a dram atic decrease of the peak heights.