AM1 Semiempirical Study of Supramolecular Bis-porphyrin 'Molecular Tweezers'

In this paper, semiempirical study of a series of space separated bis-porphyrin "molecular tweezers" using AM1 method were presented. It was found that bis-porphyrine systems such as 2 are significantly less rigid than previously thought. Variation of metal-metal separation distance does not cause significant energy change thus enabling these molecules to easily adjust to the optimal bonding distance required for complexation of various pyridyl ligands.