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Start Over Author "Lim, Jong Min" Journal chemical communications
9 results on '"Lim, Jong Min"'

7. Deprotonation induced formation of Möbius aromatic [32]heptaphyrins.

Author

Cha, Won-Young, Yoneda, Tomoki, Lee, Sangsu, Lim, Jong Min, Osuka, Atsuhiro, and Kim, Dongho

Subjects
PROTON transfer reactions, AROMATIC compounds, PORPHYRINS, AMMONIUM fluoride, MOLECULAR conformation
Abstract

Upon treatment with tetrabutylammonium fluoride (TBAF), [32]heptaphyrins 1 and 2 underwent conformational changes to form Möbius aromatic species, as indicated by the appearance of sharp and intense B-like bands and distinct Q-like bands, long-lived S1-states, and relatively large TPA cross-section values. Hence, deprotonation has been shown to be an additional effective means to induce the formation of Möbius aromatic expanded porphyrins. [ABSTRACT FROM AUTHOR]

Published
2014
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8. Conformational and spectroscopic properties of π-extended, bipyrrole-fused rubyrin and sapphyrin derivativesElectronic supplementary information (ESI) available: Synthesis, X-ray crystal data and spectroscopic data are available. CCDC 812383. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c1cc11733e

Author

Kee, Se-Young, Lim, Jong Min, Kim, Soo-Jin, Yoo, Jaeduk, Park, Jung-Su, Sarma, Tridib, Lynch, Vincent M., Panda, Pradeepta K., Sessler, Jonathan L., Kim, Dongho, and Lee, Chang-Hee

Subjects
*PORPHYRINS, *PYRROLES, *X-ray crystallography, *PROTON transfer reactions, *MACROCYCLIC compounds, *SPECTRUM analysis
Abstract

Two new expanded porphyrins, naphthorubyrin and naphthosapphyrin, were synthesized. The π-extended rubyrin was isolated and structurally characterized in its monoprotonated form. The sapphyrin congener undergoes pyrrole inversion as a function of the protonation state. These conformational effects are reflected in the spectroscopic features, including the excited singlet state lifetimes. [ABSTRACT FROM AUTHOR]

Published
2011
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9. Comparative spectroscopic studies on porphyrin derivatives: electronic perturbation of N-confused and N-fused porphyrinsElectronic supplementary information (ESI) available: Details of the experiments, theoretical calculations and spectroscopic measurements. See DOI: 10.1039/b916521e

Author

Lee, Jae Seok, Lim, Jong Min, Toganoh, Motoki, Furuta, Hiroyuki, and Kim, Dongho

Subjects
*PORPHYRINS spectra, *QUANTUM perturbations, *SPECTRUM analysis, *PYRROLES, *MOLECULAR structure, *NUMERICAL calculations
Abstract

N-confused and N-fused porphyrins revealed quite unique photophysical properties arising from their perturbed π-conjugation pathways induced by structural modifications such as confusion and fusion of pyrrole rings compared with their parent porphyrin molecules. [ABSTRACT FROM AUTHOR]

Published
2010
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