Evaluation of planarity and aromaticity in sapphyrin and inverted sapphyrin using a bidirectional NICS (Nucleus-Independent Chemical Shift) scan method

Literature Information

Publication Date 2007-03-12
DOI 10.1039/B618674B
Impact Factor 6.222
Authors

Zin Seok Yoon, Su Bum Noh, Dong-Gyu Cho, Jonathan L. Sessler, Dongho Kim


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Abstract

Using the bidirectional NICS scan method in conjunction with two-photon absorption (TPA) measurements, it has proved possible to determine the relationship between π-conjugation and aromaticity in two structurally related expanded porphyrin systems, sapphyrin and inverted sapphyrin, and establish that differences in these defining factors depend on the presence or absence of a key sp3 hybrid molecular orbital within the macrocyclic periphery.

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