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2,5-Dianilinoterephthalate bridged MM quadruply bonded complexes of molybdenum and tungsten

Chisholm, Malcolm H. and Patmore, Nathan J. (2007) 2,5-Dianilinoterephthalate bridged MM quadruply bonded complexes of molybdenum and tungsten. Dalton Transactions (1). pp. 91-96. ISSN 1477-9226

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From the reactions between 2,5-dianilinoterephthalic acid and M2(O2CBut)4 in toluene the dicarboxylate bridged complexes [(ButCO2)3M2]2{µ-1,4-(CO2)2-2,5-(NHPh)2C6H2}, 1 (M = Mo) and 2 (M = W) have been isolated. The compounds are air sensitive, sparingly soluble in aromatic hydrocarbons but appreciably soluble in tetrahydrofuran. Electronic structure calculations employing density functional theory on the model compounds [(HCO2)3M2]2{µ-1,4-(CO2)2-2,5-(NHPh)2C6H2}, indicate that the ground state structure contains a planar bridge and that for molybdenum the HOMO is a bridge based molecular orbital. However, the compounds show reversible oxidation waves (CV and DPV) that for both M = Mo and W are metal based oxidations. Furthermore, the cations 1+ and 2+ are shown to be valence trapped and fully delocalized respectively. The magnitude of the electronic coupling of the two M2 centers, Hab, can be estimated as 383 cm−1 for 1+ and 1500 cm−1 for 2+ based on the corresponding low energy IVCT or charge resonance bands

Item Type: Article
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Schools: School of Applied Sciences
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Depositing User: Sharon Beastall
Date Deposited: 03 Apr 2014 08:24
Last Modified: 28 Aug 2021 11:36


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