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Investigation of Lewis acidic behaviour of an oxygen-bridged planarized triphenylborane toward amines and properties of their Lewis acid‒base adducts

Abstract

Lewis acid behavior of an oxygen-bridged triphenylborane (1) to amines and properties of Lewis acid‒base adducts of 1 with amines have been investigated. UV-vis titration and 11B NMR experiments showed the formation of Lewis acid‒base adducts of 1 with pyridine, DMAP, quinuclidine, and DABCO, respectively (1·amine). X-ray crystallographic analysis revealed that the planar shape of 1 was converted to a bowl shape by the formation of 1·amine. Interestingly, 1·quinucidine, 12·DABCO, and 1·DABCO exhibited dual emissions. Excitation spectra and photoluminescence decay time measurements suggest that the dual emissions were ascribed to two excited species, i.e., [1·amine]* and [1]* generated by photodissociation at the excited states.

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Publication details

The article was received on 11 Jan 2018, accepted on 02 Jan 2019 and first published on 08 Jan 2019


Article type: Paper
DOI: 10.1039/C8DT00128F
Citation: Dalton Trans., 2019, Accepted Manuscript
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    Investigation of Lewis acidic behaviour of an oxygen-bridged planarized triphenylborane toward amines and properties of their Lewis acid‒base adducts

    Y. Kitamoto, F. Kobayashi, T. Suzuki, Y. Miyata, H. Kita, K. Funaki and S. Oi, Dalton Trans., 2019, Accepted Manuscript , DOI: 10.1039/C8DT00128F

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