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Transition-Metal Imido-Boroxide Complexes: A Structural and Spectroscopic Investigation of the Influence of the Boron Atom
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posted on 2023-06-08, 08:50 authored by Sarah C Cole, Martyn P Coles, Peter B HitchcockThe four coordinate compounds Mo(NR)2[OB(mes)2]2 (1, R = tBu; 2, R = Ar = 2,6-iPr2C6H3) have been obtained from the reaction of [(mes)2BOLi(Et2O)n]x with the corresponding Mo(NR)2Cl2(dme) starting material; for structural comparison, Mo(NtBu)2[OCH(mes)2]2 (3) was also synthesised. The related five-coordinate complexes Ti(NtBu)-[OB(mes)2]2(py)2 (4) and Ti(NtBu)[OCH(mes)2]2(py)2 (5) were made using analogous procedures. X-Ray structural investigations of 1-5 were performed to assess the effect that the boron atom has on the metal-oxygen and metal-nitrogen(imido) bond lengths and angles. On average, both classes of compound displayed longer metal-oxygen bonds and shorter metal-nitrogen(imido) bonds for the boroxide derivatives. Spectroscopic investigation of the ¿d values for the tert-butylimido derivatives revealed that complexes incorporating the [OB(mes)2]-anion exhibit a reduction in the electron density at the imido nitrogen atom, in agreement with the observations from the solid state structures.
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Publication status
- Published
Journal
Journal of the Chemical Society, Dalton TransactionsISSN
1472-7773Publisher
RSC PublishingIssue
22Volume
-Page range
4168 - 4174Department affiliated with
- Chemistry Publications
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- No
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- Yes
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2012-02-06Usage metrics
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