Abstract
The ground state absorbance and emission properties of a series of covalently linked biporphyrins were studied, in both their neutral and dicationic forms. The fluorescence quantum yields determined are comparable in value with that obtained from haematoporphyrin IX. Soret band splitting is observed for porphyrin rings separated by a hydrocarbon chain containing 0–3 carbons joined at the β,β′ ring positions. The biporphyrin linked directly at the meso position shows considerable steric hindrance and behaves like two independent chromophores.
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