Chemistry Letters, Vol.31, No.11, 1110-1111, 2002
Complexation of 4,4'-dipyridyl derivatives changed the orientations of metalloporphyrins linked to the cyclic peptide gramicidin S
Pairs of Zn and Co(III) porphyrins linked to the natural cyclic beta-sheet peptide, Gramicidin S, formed stable host-guest complexes with the 4,4'-dipyridyl derivatives in dichloromethane, in which the Cotton effects reflected the orientational changes of the metalloporphyrins upon the complexations.