Steric effect on excimer formation in planar Pt(II) complexes
- Authors
- Cho, Y.-J.; Kim, S.-Y.; Son, H.-J.; Cho, D.W.; Kang, S.O.
- Issue Date
- 2017
- Publisher
- Royal Society of Chemistry
- Citation
- Physical Chemistry Chemical Physics, v.19, no.7, pp.5486 - 5494
- Indexed
- SCIE
SCOPUS
- Journal Title
- Physical Chemistry Chemical Physics
- Volume
- 19
- Number
- 7
- Start Page
- 5486
- End Page
- 5494
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/86112
- DOI
- 10.1039/c6cp08651a
- ISSN
- 1463-9076
- Abstract
- In order to understand the steric influence on excimer formation in square planar metal complexes, three different Pt(ii) complexes were prepared by modifying the substituents in the main ligand: Pt(ii)(dfppy)(acac) (Pt-1, where dfppy is difluorophenylpyridine, acac is acetylacetonate); the bulky triphenyl silyl (Ph3Si-) group was substituted at the pyridine moiety (Pt-2) and at the phenyl moiety (Pt-3) of the main ligand of Pt-1. The Pt-complexes showed sky-blue emission at ∼460 nm. In addition, Pt-1 and Pt-3 showed excimer emission at ∼600 nm in the concentrated solution and the solid sample. The emission lifetimes and intensities for monomeric Pt-1 and Pt-3 showed strong concentration dependence. Indeed, the lifetime of the monomer was reduced in highly concentrated solutions due to excimer formation. The intrinsic emission lifetimes were determined as 364 ns (Pt-1) and 300 ns (Pt-3) by Stern-Volmer analysis, considering the self-quenched lifetime of monomer emission. Pt-2 did not show any excimer emission in the concentrated solution or solid sample. The crystal structures of Pt-1 and Pt-3 were analysed by X-ray crystallographic measurements. The results revealed that the LUMO moiety closely overlapped with that of another Pt-complex. In this study, based on the influence of steric hindrance of the bulky Ph3Si group, we concluded that the LUMO-LUMO interaction between the pyridine moieties of the main ligand is the main factor responsible for excimer formation. © the Owner Societies 2017.
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