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Spectroscopic and electrochemical properties of 1,3‐diketonatoboron derivatives
Author(s) -
Chow Yuan L.,
Johansson Carl I.,
Zhang YuHuang,
Gautron Rene,
Yang Li,
Rassat Andre,
Yang ShiZhu
Publication year - 1996
Publication title -
journal of physical organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.325
H-Index - 66
eISSN - 1099-1395
pISSN - 0894-3230
DOI - 10.1002/(sici)1099-1395(199601)9:1<7::aid-poc747>3.0.co;2-h
Subject(s) - chemistry , phosphorescence , excited state , acetonitrile , molar absorptivity , singlet state , photochemistry , fluorescence , boron , absorption (acoustics) , organic chemistry , physics , quantum mechanics , nuclear physics , acoustics , optics
A series of tetracoordinated boron complexes derived from various 1,3‐diketones and bidentate ligands (oxalato, malonato, catecholato and difluoro) were prepared. Their absorption, fluorescence and phosphorescence spectra, at ambient temperature and 77 K, and cyclic voltammmetry in acetonitrile were studied. The boron complexes exhibited high molar absorptivity and fluorescence intensities as compared with the parent diketones; the phenomena are in agreement with the lowest singlet excited state possessing the ϕ, ϕ,* configuration with a rigid chelate structure. The redox potential differences correlate linearly with the lowest singlet ( E s ) as well as the triplet ( E T ) excited state energy with slopes lower than unity. These linear correlations re‐state that the electron exchange and Coulombic integral also vary proportionally to the potential differences. From these correlations, it is possible to determine E s and E T of those boron complexes that do not give fluorescence and phosphorescence.