Ring rotation controversy in cerium(IV) bis(tetraarylporphyrinate) double deckers: HPLC evidence for the question to rotate or not to rotate

Masayuki Takeuchi; Tomoyuki Imada; Masato Ikeda; Seiji Shinkai

doi:10.1016/S0040-4039(98)01751-1

Ring rotation controversy in cerium(IV) bis(tetraarylporphyrinate) double deckers: HPLC evidence for the question to rotate or not to rotate

Masayuki Takeuchi, Tomoyuki Imada, Masato Ikeda, Seiji Shinkai

IMRAM - Materials-Measurement Hybrid Research Center

Kyushu University

Research output: Contribution to journal › Article › peer-review

36 Citations (Scopus)

Abstract

To obtain unequivocal evidence for the rotation of two porphyrin rings in conventional cerium(IV) bis(tetraphenylporphyrinate) double decker analogues we newly synthesized 3 with one electron-withdrawing 4-pyridyl group and three electron-donating 4-methoxyphenyl groups per one porphyrin ring. VT-¹H NMR and HPLC studies provided evidence strong enough to conclude that the two porphyrin rings do rotate in a speed a little slower than the ¹H NMR time-scale.

Original language	English
Pages (from-to)	7897-7900
Number of pages	4
Journal	Tetrahedron Letters
Volume	39
Issue number	43
DOIs	https://doi.org/10.1016/S0040-4039(98)01751-1
Publication status	Published - 1998 Oct 22

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AU - Ikeda, Masato

AU - Shinkai, Seiji

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Y1 - 1998/10/22

N2 - To obtain unequivocal evidence for the rotation of two porphyrin rings in conventional cerium(IV) bis(tetraphenylporphyrinate) double decker analogues we newly synthesized 3 with one electron-withdrawing 4-pyridyl group and three electron-donating 4-methoxyphenyl groups per one porphyrin ring. VT-1H NMR and HPLC studies provided evidence strong enough to conclude that the two porphyrin rings do rotate in a speed a little slower than the 1H NMR time-scale.

AB - To obtain unequivocal evidence for the rotation of two porphyrin rings in conventional cerium(IV) bis(tetraphenylporphyrinate) double decker analogues we newly synthesized 3 with one electron-withdrawing 4-pyridyl group and three electron-donating 4-methoxyphenyl groups per one porphyrin ring. VT-1H NMR and HPLC studies provided evidence strong enough to conclude that the two porphyrin rings do rotate in a speed a little slower than the 1H NMR time-scale.

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Ring rotation controversy in cerium(IV) bis(tetraarylporphyrinate) double deckers: HPLC evidence for the question to rotate or not to rotate

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