The effects, assessed by electrochemical techniques and single crystal structures, of ortho substitution on benzoate ligands supporting the quadruply-bonded dimolybdenum bond
摘要:
The syntheses, electrochemistry and structures of Mo-2(O2C-o-C6H4Cl)(4), 1(.)4THF, Mo-2(O2C-o-C6H4Br)(4), 2(.)2THF, Mo-2(O2C-o-C6H4I)(4), 3(.)2THF, and Mo-2(O2C-o-C6H4NO2)(4) (4), as determined by single-crystal X-ray diffraction, are reported. Molecules 1, 2, and 3 co-crystallized each with two axially coordinated THF molecules; complex 1 contained two more THF molecules within the unit cell. The Mo-Mo distances in 1-4 are 2.1029(10), 2.1014(13), 2.1055(7), and 2.0942(12) Angstrom, respectively. The oxidation potentials for 1-3 were similar at 674, 655, and 647 mV, but that for 4 at an E-1/2(ox) of 792 mV was higher. (C) 2002 Elsevier Science B.V. All rights reserved.