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 β-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.