Cu<sup>(I)</sup>(2,9-Bis(trifluoromethyl)-1,10-phenanthroline)<sub>2</sub><sup>+</sup> Complexes: Correlation between Solid-State Structure and Photoluminescent Properties
作者:Andrey Yu. Kovalevsky、Milan Gembicky、Philip Coppens
DOI:10.1021/ic049638s
日期:2004.12.1
The 90K solid-state structures, room temperature absorption, and room temperature and 17 K emission spectra of seven different salts of [Cu(I)(bfp)(2)](+) (bfp = 2,9-bis(trifluoromethyl)-1,10-phenanthroline) have been determined. To quantify the distortion of the Cu coordination environment, a distortion parameter zeta is defined that is a combined measure of the flattening, rocking, and wagging distortions of the complex cations. In general, the distortion in the (bfp) cations is less than found previously for Cu(I)(dmp)(2) (dmp = 2,9-dimethyl-1,10-phenanthroline) salts, in particular the flattening is reduced because of the bulkier 2,9-substituents. The 17 K lifetimes range up to 1.8 mus in the series of solids examined and, with the marked exception of the BF4- salt, correlate linearly with the distortion parameter zeta. The emission wavelength red-shifts with decreasing lifetime, which implies that an increased groundstate distortion is associated with a smaller energy gap.