Evaluation of planarity and aromaticity in sapphyrin and inverted sapphyrin using a bidirectional NICS (Nucleus-Independent Chemical Shift) scan method?
Using the bidirectional NICS scan method in conjunction with two-photon absorption (TPA) measurements, it has proved possible to determine the relationship between pi-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.
Yoon
Zin Seok
ZS
Department of Chemistry, Yonsei University, Seoul 120-749, Korea.
Noh
Su Bum
SB
Cho
Dong-Gyu
DG
Sessler
Jonathan L
JL
Kim
Dongho
D
D011166:Porphyrins / Q000737:chemistry*; D013057:Spectrum Analysis / Q000379:methods*
D011166:Porphyrins; C440448:sapphyrin