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205521

Oxygen quenching of the excited MLCT state of ruthenium (II) bipyridyl heteroleptic complexes and singlet oxygen thereby produced

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Last updated: 03 Jan 2025

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Abstract

Photophysical properties of some heteroleptic bipyridyl ruthenium (II) complexes are investigated.  The lifetimes of the excited triplet metal to ligand charge transfer states, 3MLCT, of the complex ions are about 0.60±0.05 ms with two exceptions where the lifetimes drop to 2.4 ns for [Ru(bpy)2(dmp)]2+, dmp=2,9-dimethyl-1,10-phenanthroline and 1.50 ms for [Ru(bpy)2(dpp)]2+, dpp=4,7-diphenyl-1,10-phenanthroline. The rate constants, kq, for quenching in acetonitrile of the 3MLCT states of these ruthenium complex ions by molecular oxygen, O2(3Sg-), and the variations in the efficiency, fDT, with which excited singlet oxygen, O2*(1Dg), is thereby produced are reported. The quenching rate constants are in the range 1.5- 2.2 x 109 dm3 mol-1 s-1 and efficiencies of singlet oxygen production are in the range 0.55- 0.85. The inverse correlation kq and fDT is not observed for the current set of complexes.

DOI

10.21608/jsrs.2019.205521

Keywords

Ruthenium(II) bipyridyl complexes, Singlet oxygen, Quenching

Authors

First Name

Karim

Last Name

El-Naggar

MiddleName

S. A.

Affiliation

Department of Chemistry, Faculty of Science, Ain Shams University, 11566 Abbassia, Cairo, Egypt.

Email

karimel-naggar@hotmail.com

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Orcid

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First Name

Hesham

Last Name

S. Abdel-Samad

MiddleName

-

Affiliation

Department of Chemistry, Faculty of Science, Ain Shams University, 11566 Abbassia, Cairo, Egypt.

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Orcid

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First Name

Mohamed

Last Name

E. El-Khouly

MiddleName

-

Affiliation

Department of Chemistry, Faculty of Science, Kafrelsheikh University, Kafr El-Sheikh 33516, and Institute of Basic and Applied Sciences, Egypt-Japan University of Science and Technology, Egypt.

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Orcid

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First Name

Ayman

Last Name

A. Abdel-Shafi

MiddleName

-

Affiliation

Department of Chemistry, Faculty of Science, Ain Shams University, 11566 Abbassia, Cairo, Egypt.

Email

-

City

-

Orcid

-

First Name

Karim

Last Name

El-Naggar

MiddleName

S. A.

Affiliation

Department of Chemistry, Faculty of Science, Ain Shams University, 11566 Abbassia, Cairo, Egypt.

Email

rramadan@asunet.shams.edu.eg

City

-

Orcid

-

Volume

36

Article Issue

1

Related Issue

5321

Issue Date

2019-04-01

Receive Date

2021-11-19

Publish Date

2019-04-01

Page Start

539

Page End

551

Print ISSN

2356-8364

Online ISSN

2356-8372

Link

https://jsrs.journals.ekb.eg/article_205521.html

Detail API

https://jsrs.journals.ekb.eg/service?article_code=205521

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35

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Original Article

Type Code

656

Publication Type

Journal

Publication Title

Journal of Scientific Research in Science

Publication Link

https://jsrs.journals.ekb.eg/

MainTitle

Oxygen quenching of the excited MLCT state of ruthenium (II) bipyridyl heteroleptic complexes and singlet oxygen thereby produced

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Type

Article

Created At

22 Jan 2023