Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 14, Issue 29, Pages 9020-9029Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200800804
Keywords
cluster compounds; molybdenum; phosphorus; reactive intermediates; tungsten
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Funding
- Alexander von Humboldt Foundation
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Thermolysis of [Cp*P{W(CO)(5)}(2)] (1) in the presence Of [{CpMo(CO)(2)}(2)] leads to the novel complexes [{(CO)(2)CP*W}-(CpMo(CO)(2)} (mu,eta(2):eta(1):eta(1)-P-2[W(CO)(5)}(2))] (6; Cp = eta(5)-C5H5, Cp* = eta(5)-C5Me5), [{(mu-O)(CpMoWCp*)W(CO)(4)}{mu(3)-PW(CO)(5))(2)] (7), [{CpMo(CO)(2)}(2)-{Cp*W(CO)(2)}{mu(3)-PW(CO)(5)}] (8) and [{CpMo(CO)(2)}(2){Cp*W(CO)(2)}(mu(3)-P)] (9). The structural framework of the main products 8 and 9 can be described as a tetrahedral Mo2WP unit that is formed by a cyclisation reaction of [{CpMo(CO)(2)}(2)] with an [Cp*(CO)(2)W P -> W(CO)(5)] intermediate containing a W-P triple bond and subsequent metal-metal and metal-phosphorus bond formation. Photolysis of 1 in the presence of [{CpMo(CO)(2)}(2)] gives 8, 9 and phosphinidene complex [(mu(3)-PW(CO)(5)){CpMo(CO)(2)W(CO)(5)}] (10), in which the P atom is in a nearly trigo nal-planar coordination environment formed by one {CpMo(CO)(2)} and two {W(CO)(5)} units. Comprehensive structural and spectroscopic data are given for the products. The reaction pathways are discussed for both activation procedures, and DFT calculations reveal the structures with minimum energy along the stepwise Cp* migration process under formation of the intermediate [CP*(CO)(2)W P -> W(CO)(5)].
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