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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

Authors
Journal
Tetrahedron Letters
0040-4039
Publisher
Elsevier
Publication Date
Volume
39
Issue
43
Identifiers
DOI: 10.1016/s0040-4039(98)01751-1

Abstract

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

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