Cov khoom

Ib tug series ntawm bimetallic complexes ntawm ruthenium (II) txuas los ntawm heterocyclic ligands tsim los ntawm condensation ntawm 4,5-diazafluoren-9-ib tug nrog ntau yam diamines, hydrazine, 1,4-phenylenediamine, benzidine, thiab 4,4'-methylenedianiline, ua rau cov chaw hlau sib cais los ntawm ntau qhov kev ncua deb.Cov complexes ua rau cov hlau-rau-ligand them-hloov absorptions hauv thaj tsam 450 nm ntawm qhov pom spectrum thiab intraligand pi --> pi hloov hauv thaj tsam 300 nm ntawm ultraviolet spectrum.Lub ruthenium(II) cov chaw yog oxidized nyob rau hauv ob ze spaced ib-electron txheej txheem ntawm muaj peev xwm ntau zoo tshaj qhov ntawd rau Ru(bpy)(3)(2+).Lub bridging ligands raug txo los ntawm ob qhov chaw nyob ze ib-electron cov txheej txheem ntawm ntau qhov zoo tshaj qhov uas txo cov kev sib koom tes ntawm bipyridine ligands (kwv yees li -1.30 V), txawm hais tias cov diazafluorene = NN = diazafluorene bridging ligand yog txo reversibly nyob rau hauv ob leeg-electron. Cov kauj ruam ntawm E(1/2) qhov tseem ceeb ntawm -0.29 thiab -0.52 V. Tom qab ntxuav los ntawm eluting cov ntshiab complexes tshaj ib silica gel kem nrog ntau yam concentrations ntawm 0.10 M NH(4)PF(6) nyob rau hauv methanol, emission tshwm sim xwb nyob rau hauv iav matrix ntawm 77 K thiab ntawm qhov kub thiab txias hauv kev daws.emission lifetimes ntawm 77 K nyob rau hauv ib tug 4: 1 ethanol: methanol iav yog 5 +/- 1 & mgr; s.Ib txoj kev tshawb nrhiav qhov kub thiab txias emissions lub neej qhia tau hais tias muaj lub xeev qis nrog DeltaE = kwv yees li 1500 cm(-)(1), thiab extrapolation mus rau chav tsev kub qhia tias lub emission lifetime nyob rau hauv subnanosecond range.