Luminescence quenching of mixed-ligand ruthenium (II) complexes by different quenchers

Nathir A.F. Al-Rawashdeh; Khaled Shawakfeh; Sumaia Khadir

Luminescence quenching of mixed-ligand ruthenium (II) complexes by different quenchers

Nathir A.F. Al-Rawashdeh, Khaled Shawakfeh, Sumaia Khadir

Research output: Contribution to journal › Article › peer-review

Abstract

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 (k_q) 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.

Original language	English
Pages (from-to)	425-436
Number of pages	12
Journal	Acta Chimica Slovenica
Volume	49
Issue number	3
Publication status	Published - Sept 2002
Externally published	Yes

ASJC Scopus subject areas

General Chemistry

Cite this

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title = "Luminescence quenching of mixed-ligand ruthenium (II) complexes by different quenchers",

abstract = "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.",

author = "Al-Rawashdeh, \{Nathir A.F.\} and Khaled Shawakfeh and Sumaia Khadir",

year = "2002",

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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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Luminescence quenching of mixed-ligand ruthenium (II) complexes by different quenchers

Abstract

ASJC Scopus subject areas

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