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Origin of Fluorescence from Boranils in the Crystalline Phase

Lookup NU author(s): Hatun AlSharif, Dr Raymond Ziessel, Dr Paul Waddell, Dr Casey Dixon, Emeritus Professor Anthony Harriman

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Abstract

Copyright © 2020 American Chemical Society. A small series of boranil complexes has been studied by fluorescence spectroscopy. Weakly fluorescent in most organic solvents at room temperature, the target compounds display bright emission in the crystalline phase. X-ray diffraction patterns obtained for single crystals indicate a distorted tetrahedral geometry around the O-B-N center with the boron atom being displaced from the plane of the heterobicyclic ring. Consideration of the various bond lengths in comparison with those of reference compounds indicates that the ancillary phenyl ring, bearing different para-substituents, does not make a prominent contribution to the molecular dipole moment in the solid state. Absorption and fluorescence spectra recorded for the crystals remain remarkably similar to those for liquid solutions and display large Stokes shifts. Proximity broadening is observed in one case. The nitrophenyl derivative exhibits additional absorption and emission bands unique to the solid state and could be indicative of an intermolecular charge-transfer transition. The optical properties are discussed in terms of the crystal packing diagrams.


Publication metadata

Author(s): Al-Sharif HHT, Ziessel R, Waddell PG, Dixon C, Harriman A

Publication type: Article

Publication status: Published

Journal: Journal of Physical Chemistry A

Year: 2020

Volume: 124

Issue: 11

Pages: 2160-2172

Print publication date: 19/03/2020

Online publication date: 28/02/2020

Acceptance date: 28/02/2020

ISSN (print): 1089-5639

ISSN (electronic): 1520-5215

Publisher: American Chemical Society

URL: https://doi.org/10.1021/acs.jpca.0c00905

DOI: 10.1021/acs.jpca.0c00905

PubMed id: 32111115


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