Two kinds of new osmium(II) porphyrin oligomers having tetraarylporphyrins with 3-pyridyl and phenyl groups as axial or a bridging ligands, Dimer-Oblique and cis-Trimer-Oblique were synthesized and characterized by spectral methods. In cis-Trimer-Oblique, atropisomerization caused by the rotation of pyridyl groups was observed by 1H NMR spectral measurements at room temperature.
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Kariya et al. (1998) studied this question.
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