TY - JOUR
T1 - Luminescence quenching of mixed-ligand ruthenium (II) complexes by different quenchers
AU - Al-Rawashdeh, Nathir A.F.
AU - Shawakfeh, Khaled
AU - Khadir, Sumaia
PY - 2002/9
Y1 - 2002/9
N2 - The effect of ionic strength and acidity (pH) on the luminescence quenching of the excited states of a number of mixed-ligand Ru(II) complexes have been studied. The mixed-ligand Ru(II) complexes of diphenyl-thioethylene (dpte); 2,2-bipyridine (bpy), 2-(2-pyridyl)-quinoline (pyq); 4,6-dichloro-2-(2-pyridyl)pyrimidine (dcppm); 4,6-dichloro-5-methyl-2-(2-pyridyl)pyrimidine (dcmppm); 4,6-dichloro-5-phenyl-2-(2 pyridyl)pyrimidine (dcpppm) with three quenchers: N,N,N′,N ′-tetramethyl-p-phenlyenediamine (TMPD2+), methyl viologen (Mv2+), and ethylenediaminetetraacetic acid (EDTA) have been used to study the effect of acidity. Whereas, for the effect of ionic strength, [Ru(dpte)2(dcpppm)]2+/EDTA system has been used. The quenching rate constant (kq) was found to increase with decreasing the ionic strength, while pH has the opposite effect. The quenching of mixed-ligand Ru(II) complexes by TMPD2+ in aqueous solutions was shown to be dynamic and static in nature.
AB - The effect of ionic strength and acidity (pH) on the luminescence quenching of the excited states of a number of mixed-ligand Ru(II) complexes have been studied. The mixed-ligand Ru(II) complexes of diphenyl-thioethylene (dpte); 2,2-bipyridine (bpy), 2-(2-pyridyl)-quinoline (pyq); 4,6-dichloro-2-(2-pyridyl)pyrimidine (dcppm); 4,6-dichloro-5-methyl-2-(2-pyridyl)pyrimidine (dcmppm); 4,6-dichloro-5-phenyl-2-(2 pyridyl)pyrimidine (dcpppm) with three quenchers: N,N,N′,N ′-tetramethyl-p-phenlyenediamine (TMPD2+), methyl viologen (Mv2+), and ethylenediaminetetraacetic acid (EDTA) have been used to study the effect of acidity. Whereas, for the effect of ionic strength, [Ru(dpte)2(dcpppm)]2+/EDTA system has been used. The quenching rate constant (kq) was found to increase with decreasing the ionic strength, while pH has the opposite effect. The quenching of mixed-ligand Ru(II) complexes by TMPD2+ in aqueous solutions was shown to be dynamic and static in nature.
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M3 - Article
AN - SCOPUS:0036747960
SN - 1318-0207
VL - 49
SP - 425
EP - 436
JO - Acta Chimica Slovenica
JF - Acta Chimica Slovenica
IS - 3
ER -