Neutral,cationic and dicationic seven-coordinate complexes of molybdenum(II) and tungsten(II) containing mono- and bidentate nitrogen donor ligands |
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| Authors: | Paul K Baker Lesley L Howells Stuart G Fraser Gordon W Rogers Martin J Snowden |
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| Institution: | (1) Department of Chemistry, University College of North Wales, LL57 2UW Bangor, Gwynedd, UK |
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| Abstract: | Summary The seven-coordinate complexes MI2(CO)3(NCMe)2] (M=Mo or W) react with two equivalents of L(L=py, 4Me-py, 3Cl-py or 3Br-py) or one equivalent of NN {NN=2,2 -bipyridine(bipy), 1,10-phenanthroline(phen), 5,6-dimethyl-1, 10-phenanthroline (5,6-Me2-1, 10-phen), 5-Nitro-1, 10-phenanthroline (5-NO2-1, 10-phen) and C6H4(o-NH2)2 (o-diam) (for M=Mo only)} in CH2Cl2 at room temperature to give the substituted products MI2(CO)3L2] or MI2(CO)3(NN)] (1–17) in high yield. The compounds MI2(CO)3(NCMe)2] react with two equivalents of NN (for M=W, NN=bipy; for M=Mo, NN=phen) to give the dicationic salts M(CO)3(NN)2]2I(18–19). The compounds MI2(CO)3(NCMe)2] (M=Mo or W) react with two equivalents of 5,6-Me2-1, 10-phen to yield the monocationic dicarbonyl compounds MI(CO)2(5,6-Me2-phen)2]I (20 and21). The dicationic mixed ligand complexes M(CO)3(bipy)(5,6-Me2-phen)]2I (22 and23) are prepared by reacting MI2(CO)3(NCMe)2] with one equivalent of bipy, followed by anin situ reaction with 5,6-Me2-1, 10-phen to afford the products22 and23. The complexes (1–23) described in this paper have been characterised by elemental analysis (C, H and N), i.r. spectroscopy and, in selected cases,1Hn.m.r. spectroscopy. Magnetic susceptibility measurements show the compounds to be diamagnetic. |
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