The geometrical isomerism effect of C2-symmetric cationic [Ir(C^N)2(N^N)]+ complexes [Ir(pba)2(bpy)]+(PF6)-

IF 3.8 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2026-01-01 Epub Date: 2025-10-10 DOI:10.1016/j.jlumin.2025.121604

Jiapeng Wang , yiqi Zhuang , Rong Chen , Youquan Chen, Yu Chen, Rong Li, Guorui Fu, Xingqiang Lü

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Abstract

In contrast to the well-known different photophysical properties induced by geometrical isomers of neutral [Ir(C^N)₃/[Ir(C^N)₂(L^X)], the effect of geometrical isomerism of cationic [Ir(C^N)₂(N^N)]⁺ on their optical property, remains very limited. Herein, using [Ir(pba)₂(bpy)]⁺ (Hpba = 4-(2-pyridyl)benzaldehyde; bpy = 2,2-bipyridine) as the representative, its new C^C′-trans-and-N^N′-cis-dispositioned is simultaneously obtained with the traditional C^C′-cis-and-N^N′-trans-[Ir(pba)₂(bpy)]⁺(PF₆)^-. Notably, through experimental/theoretical analyses, the emissive color difference (yellow-green (λ_em = 545 nm) versus yellow (λ_em = 574 nm) of the two geometrical isomers to [Ir(pba)₂(bpy)]⁺ is confirmed to be resulted from different C^C′-cis-and-N^N′-trans-/C^C′-trans-and-N^N′-cis-disposition of the two pba-main ligands within.

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c2对称阳离子[Ir(C^N)2(N^N)]+配合物[Ir(pba)2(bpy)]+(PF6)-的几何异构效应

与中性[Ir(C^N)3/[Ir(C^N)2(L^X)]的几何异构体引起的众所周知的不同光物理性质相反，阳离子[Ir(C^N)2(N^N)]+的几何异构体对其光学性质的影响仍然非常有限。本文采用[Ir(pba)2(bpy)]+ (Hpba = 4-（2-吡啶基）苯甲醛；bpy = 2,2-联吡啶)为代表，与传统的C^C ' -顺式和N^N ' -反式[Ir(pba)2(bpy)]+(PF6)-同时得到新的C^C ' -反式和N^N ' -顺式。值得注意的是，通过实验/理论分析，证实了[Ir(pba)2(bpy)]+的两种几何异构体的发射色差(黄绿色（λem = 545 nm）与黄色（λem = 574 nm）是由于两种pba-主配体的C^C ' -顺式和N^N ' -反式/C^C ' -反式和N^N ' -顺式配置不同所致。

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来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.