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Time-resolved spectroscopic study on chiral supramolecules consist of bis(zinc octaethylporphyrin) and (R)- and (S)-diaminocyclohexanes using; transient absorption, CD,and EPR spectroscopies.

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Title:	Time-resolved spectroscopic study on chiral supramolecules consist of bis(zinc octaethylporphyrin) and (R)- and (S)-diaminocyclohexanes using; transient absorption, CD,and EPR spectroscopies.
Authors:	Murakami, Makoto¹ (AUTHOR), Imai, Ken¹ (AUTHOR), Ida, Takahito¹ (AUTHOR), Araki, Yasuyuki¹ (AUTHOR) y.araki@tohoku.ac.jp, Wada, Takehiko¹ (AUTHOR), Yamauchi, Seigo¹ (AUTHOR), Kobori, Yasuhiro² (AUTHOR), Ito, Osamu¹ (AUTHOR)
Source:	Research on Chemical Intermediates. Mar2026, Vol. 52 Issue 3, p1949-1963. 15p.
Subjects:	Time-resolved spectroscopy, Circular dichroism, Triplet state (Quantum mechanics), Absorption spectra, Organic compounds, Electron paramagnetic resonance spectroscopy, Supramolecules, Porphyrins
Abstract:	We developed a new method to measure the time-resolved CD (TR-CD) spectra of the photo-excited triplet states of chiral supramolecules of bis(zinc octaethylporphyrin) and (R)- and (S)-diaminocyclohexane in the wide wavelength region (UV and visible) even overlapping with the intense steady-state CD signals. Such measurements are possible by developing a high-sensitive TR-CD equipment assembled in our laboratory. The observed TR-CD spectra of the triplet states of chiral supramolecules show mono-signate CD signals corresponding to each transient absorption band in the 300–500-nm region. Combination of the TR-CD spectral pattern with the dynamic behavior of the CD signals in the excited triplet states affords information for the electron distribution change of the triplet state from that of the ground state. In addition, the zero-field splitting parameters obtained from the time-resolved EPR spectra of the photo-excited supramolecules suggest that the electron spin density distributes on one side of two porphyrin rings of the chiral bis-porphyrin supramolecules in the triplet states, which is further confirmed by the DFT calculations. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

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Abstract:	We developed a new method to measure the time-resolved CD (TR-CD) spectra of the photo-excited triplet states of chiral supramolecules of bis(zinc octaethylporphyrin) and (R)- and (S)-diaminocyclohexane in the wide wavelength region (UV and visible) even overlapping with the intense steady-state CD signals. Such measurements are possible by developing a high-sensitive TR-CD equipment assembled in our laboratory. The observed TR-CD spectra of the triplet states of chiral supramolecules show mono-signate CD signals corresponding to each transient absorption band in the 300–500-nm region. Combination of the TR-CD spectral pattern with the dynamic behavior of the CD signals in the excited triplet states affords information for the electron distribution change of the triplet state from that of the ground state. In addition, the zero-field splitting parameters obtained from the time-resolved EPR spectra of the photo-excited supramolecules suggest that the electron spin density distributes on one side of two porphyrin rings of the chiral bis-porphyrin supramolecules in the triplet states, which is further confirmed by the DFT calculations. [ABSTRACT FROM AUTHOR]
ISSN:	09226168
DOI:	10.1007/s11164-025-05893-x