R P Pandian
Articles written in Journal of Chemical Sciences
Volume 102 Issue 3 June 1990 pp 307-318
Synthesis and spectroscopic properties of porphyrin macrocycles with sulphur as the heteroatom in the porphyrin core have been studied. Electronic absorption spectra of these macrocycles show porphyrin-like behaviour with a strong Soret band and weak
The water-soluble S2TPPS, prepared from sulphonating the para positions of phenyl rings shows extensive aggregation at high concentrations (> 10−4M). At low concentrations (≈ 10−6–10−7M), dimerisation can be induced by the addition of cations (K+, NH4+ ) and cation-crown ether complex. The induced red shifts upon dimerisation parallel findings reported for a variety of cofacial covalently linked porphyrin dimers.
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