Issue 90, 2016, Issue in Progress

Synthesis, structures and photophysical properties of luminescent cyanoruthenate(ii) complexes with hydroxylated bipyridine and phenanthroline ligands

Abstract

Treatment of (PPh4)2[RuII(PPh3)2(CN)4] (1) with bpyOH and phenOH in DMF afforded two mononuclear compounds fac-(PPh4)[RuII(bpyOH)(PPh3)(CN)3] (2) and fac-(PPh4)[RuII(phenOH)(PPh3)(CN)3] (3), respectively (bpyOH = 6-hydroxy-2,2′-bipyridine; phenOH = 2-hydroxy-1,10-phenanthroline). These complexes have been characterized by various spectroscopic techniques. The structures of 1 and 2 have also been determined by X-ray crystallography. Their photophysical and electrochemical properties have been investigated. Compound 3 displays intense emission with much higher quantum efficiency (Φem = 19.4%) in solution, compared with other related ruthenate(II) diimine complexes. In addition, their solvatochromism, pH effects, and ion perturbation have also been investigated. The different photoluminescent behaviors between these complexes and the previously reported complex [RuII(phen)(PPh3)(CN)3] suggest that the introduction of the hydroxyl group into the diimine ligand would significantly affect their emission properties. Through spectrophotometric titrations, the ground state pKa and excited state pKa* values, as well as the dynamic pH response ranges of these complexes have been determined. Their photophysical response towards various metal ions have also been studied.

Graphical abstract: Synthesis, structures and photophysical properties of luminescent cyanoruthenate(ii) complexes with hydroxylated bipyridine and phenanthroline ligands

Supplementary files

Article information

Article type
Paper
Submitted
24 Jun 2016
Accepted
20 Aug 2016
First published
05 Sep 2016

RSC Adv., 2016,6, 87389-87399

Synthesis, structures and photophysical properties of luminescent cyanoruthenate(II) complexes with hydroxylated bipyridine and phenanthroline ligands

C. Shen, F. Yu, W. Chu, J. Xiang, P. Tan, Y. Luo, H. Feng, Z. Guo, C. Leung and T. Lau, RSC Adv., 2016, 6, 87389 DOI: 10.1039/C6RA16319J

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