Synthesis of 2, 7, 12, 17-tetraaryl-3, 8, 13, 18-tetranitroporphyrins; electronic effects on aggregation properties of porphyrins

…, E Muratani, Y Fumoto, T Ogawa, K Tazima

Index: Ono, Noboru; Muratani, Emiko; Fumoto, Yumiko; Ogawa, Takuji; Tazima, Kunihiko Journal of the Chemical Society - Perkin Transactions 1, 1998 , # 22 p. 3819 - 3824

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Citation Number: 3

Abstract

Novel porphyrins substituted with aryl and nitro substituents at the β-position were prepared by the tetramerization of 2-hydroxymethyl-3-aryl-4-nitropyrroles. Aggregation properties of these porphyrins are investigated by means of UV–VIS, 1H-NMR and EPR spectroscopy. Porphyrin 4a substituted with 4-methoxyphenyl and nitro groups was found to form a strong cofacial aggregate in solution (K= 900–1300 dm3 mol–1). The extent of aggregation ...