engleski

High pressure synthesis of 7-silanorbornenes and Molecular design and complexation properties of supramolecular bis-porphyrin ''molecular tweezers''

A computational study of a series of space separated bis-porphyrin “ molecular tweezers” using the AM1 method has been conducted. It was found that bis-porphyrin systems possessing polycyclic spacers are significantly less rigid than previously thought. Variation of the metal-metal separation distance does not cause a significant energy change thus enabling these molecules to easily adjust to the optimal bonding distance required for complexation of various pyridyl ligands. Binding energies for a series of guests were estimated and indicated that the preferred complexation occurs within the cavity of these molecular tweezers (selective binding). By molecular design, bis-porphyrin 1, having a more flexible framework incorporating two “ molecular hinges” was synthetised. Its complexation with bis-pyridyl guests was studied by NMR and UV spectroscopy.

host-guest chemistry; supramolecular chemistry; porphyrins; norbornenes

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