Diamines as auxiliary ligands for tuning photophysical and electrochemical properties of Ruthenium(II) polypyridyl complexes

被引：4

作者：

A-Rashdi, Kamelah S. ^{[1
]}

Babgi, Bandar A. ^{[1
,2
]}

Sahin, Cigdem ^{[3
]}

Eltayeb, Naser E. ^{[2
]}

Moxey, Graeme J. ^{[4
]}

Humphrey, Mark G. ^{[4
]}

Basaleh, Amal S. ^{[1
]}

机构：

[1] King Abdulaziz Univ, Dept Chem, Fac Sci, POB 80203, Jeddah 21589, Saudi Arabia

[2] King Abdulaziz Univ, Dept Chem, Coll Sci & Art, POB 344, Rabigh 21911, Saudi Arabia

[3] Pamukkale Univ, Art & Sci Fac, Dept Chem, TR-20160 Pamukkale, Denizli, Turkey

[4] Australian Natl Univ, Res Sch Chem, Canberra, ACT 2601, Australia

来源：

JOURNAL OF MOLECULAR STRUCTURE | 2018年 / 1158卷

关键词：

Ruthenium(II); Polypyridyls; Photophysical properties; Luminescence; Electrochemical properties; TRANSITION-METAL-COMPLEXES; CHARGE-TRANSFER; RU(II) COMPLEXES; EXCITED-STATES; LUMINESCENT; PHOTOCHEMISTRY;

D O I：

10.1016/j.molstruc.2018.01.026

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The complex with the formula [Ru(bpy)(2)(2,3-diaminonaphthalene)1[PF6] (5) was synthesized and characterized by H-1 NMR spectroscopy, mass spectrometry and elemental analysis. A set of previously reported complexes with the formula [Ru(bpy)(2)(diamine)][PF6]{diamine = 1,2-diaminoethane (2), o-phenylenediamine (3), 1,2-diaminocyclohexane (4) I was synthesized and crystal structures were obtained for complexes 3 and 4. UV vis absorption spectra of the complexes 2-5 were collected and compared to that of [Ru(bPY)(3)][PF6](2) (1), showing that the MLCT band is red-shifted upon introducing the diamine ligands in place of bipyridine. Emission spectra, excited-state lifetimes and emission quantum yields were collected at room temperature for the complexes 1-5, showing considerable changes in the photophysical characteristics upon the introductions of the diamine. The emission spectrum of 5 exhibits an intense emission in the far red-NIR region when excited at 510 nm. The cyclic voltammograms of the complexes 1-5 show one oxidation peak between 0.98 V and 1.15 V which is attributed to the Ru(II)/Ru(III) oxidation couple. Calculated HOMO and LUMO energy levels from both electrochemical data and theoretical calculations suggest a lower HOMO energy level for complex 1 than the diamino-containing complexes, presumably due to the stronger ligand field of the bipyridine. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：197 / 204

页数：8

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