Synthesis, crystal structure and photoluminescence of [NHEt3][Re(I)(quinaldate)(CO)3Cl]

The salt [NHEt3]Re(I)(quinaldate)(CO)(3)Cl] was obtained by the reaction of Re(CO)(5)Cl with quinaldic acid and triethylamine in toluene. The crystal structure analysis of this salt revealed the presence of the complex anion [Re(quinaldate)(CO)(3)Cl] , with the d(6) Re(I) metal center in a pseudo-octahedral environment. The electronic spectra in absorption and emission exhibit bands which are attributed to quinaldate IL and CT transitions at comparable energies. The longest-wavelength emission originates from a Re(I) to quinaldate MLCT triplet, which can be quenched in solution by oxygen or triethylamine.