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Abstract <p>Here, the ground and excited state dynamics of [Ru(bpy)<sub>2</sub>(η<sup>2</sup>-tpy)]<sup>2+</sup> were studied. Protonation of the pendant pyridine ring of [Ru(bpy)<sub>2</sub>(η<sup>2</sup>-tpy)]<sup>2+</sup> demonstrates that intra-ligand charge transfer (ILCT) occurs between the pendant pyridine and adjacent bpy ligand in the [Ru(bpy)<sub>2</sub>(η<sup>2</sup>-tpy)]<sup>2+</sup> complex. The addition of trifluroacetic acid (TFA) results in slight spectral changes which have been assigned to the protonation of the pendant pyridine of [Ru(bpy)<sub>2</sub>(η<sup>2</sup>-tpy)]<sup>2+</sup>. The protonation of the pendant pyridine increases the lifetime from 0.082 ns to 2.6 ns. Mulliken-Hush analysis of the ILCT of [Ru(bpy)<sub>2</sub>(η<sup><i>2</i></sup>-tpy)]<sup>2+</sup> has been done and compared with that of [Ru(bpy)<sub>3</sub>]<sup>2+</sup>. The value for the electronic coupling element (<i>H</i><sub>DA</sub>) for [Ru(bpy)<sub>2</sub>(η<sup>2</sup>-tpyH<sup>+</sup>)]<sup>3+</sup> suggests that the electronic coupling between bpy and the pendant pyridine is quite strong.</p>

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Comparison of Ground and Excited States of [Ru(bpy)2(η2-tpy)]2+ (bpy = 2,2'-Bipyridine; tpy = Terpyridine) and Associated Protonation Chemistry

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Mohammad Aminur Rahman

摘要

Abstract

Here, the ground and excited state dynamics of [Ru(bpy)2(η2-tpy)]2+ were studied. Protonation of the pendant pyridine ring of [Ru(bpy)2(η2-tpy)]2+ demonstrates that intra-ligand charge transfer (ILCT) occurs between the pendant pyridine and adjacent bpy ligand in the [Ru(bpy)2(η2-tpy)]2+ complex. The addition of trifluroacetic acid (TFA) results in slight spectral changes which have been assigned to the protonation of the pendant pyridine of [Ru(bpy)2(η2-tpy)]2+. The protonation of the pendant pyridine increases the lifetime from 0.082 ns to 2.6 ns. Mulliken-Hush analysis of the ILCT of [Ru(bpy)2(η2-tpy)]2+ has been done and compared with that of [Ru(bpy)3]2+. The value for the electronic coupling element (HDA) for [Ru(bpy)2(η2-tpyH+)]3+ suggests that the electronic coupling between bpy and the pendant pyridine is quite strong.