کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1232784 | 1495275 | 2012 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis and physico-chemical studies of cyclometalated heteroleptic iridium(III) complexes Synthesis and physico-chemical studies of cyclometalated heteroleptic iridium(III) complexes](/preview/png/1232784.png)
Phosphorescent studies of 2-arylimidazole heteroleptic cyclometalated iridium(III) complexes with picolinic acid as the ancillary ligand were made. The observed experimental data reveals that these complexes possess dominantly 3MLCT and 3π–π* excited states and the solvent shift of these complexes are interpreted by Reichardt–Dimroth and Marcus solvent functions. The results are consistent with prior assignments on the absorption band to a metal-to-ligand charge transfer excited state associated with chelating ligand. Emission kinetic studies exploited that the radiative transition (kr), increases with increasing λemi.
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► Bands located at longer wavelength assigned to 1MLCT ← S0 and 3MLCT ← S0 transitions.
► 3MLCT ← S0 is allowed by mixing of spin–orbit coupling.
► 3MLCT ← S0 is close to 1MLCT ← S0.
► Mixing of excited states (LC and MLCT).
► (1E1–3E1) increases with decrease in λem, hence, kr increases with increase in λem.
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 93, July 2012, Pages 240–244