Synthesis, spectral-luminescent properties of B(III) and Zn(II) complexes with alkyl- and aryl-substituted dipyrrins and azadipyrrins
作者:E. V. Antina、M. B. Berezin、N. A. Dudina、S. L. Burkova、A. Yu. Nikonova
DOI:10.1134/s0036023614100027
日期:2014.10
Effect of complexing atom, molecular structure of dipyrrolylmethene and its aza analog on spectral-luminescent properties of heteroleptic boron(III) and homoleptic zinc(II) complexes with 3,3',5,5'-tetramethyl-2,2'-dipyrrolylmethene, 3,3',5,5'-tetraphenyl-2,2'-dipyrrolylmethene, and 3,3',5,5'-tetraphenyl-ms-aza-2,2'-dipyrrolylmethene in organic solvent solutions was studied. The complexes were found to exhibit strong chromophore (lambda = 350-690 nm, E > similar to 10(5) L/mol cm) and fluorescent properties. Quantum yield (gamma(fl)) for fluoroborate complexes reaches 100% and is weakly dependent on medium nature. The value of gamma(fl) for phenyl- and alkyl-substituted zinc(II) dipyrrolylmethenates in nonpolar solvents is not higher 0.3 and 0.03, respectively; complete fluorescence quenching is observed in electron-donating solvents. Aza-substitution at the meso spacer causes considerable shift of electronic absorption and fluorescence spectra to the red region but completely quenches fluorescence of zinc(II) chelates and decreases gamma(fl) of boron(III) complex to 0.04.