Influence of Dielectric Constant on Spectral Behaviour of Cobalt – Phthalocyanine
Physical Chemistry Laboratory, Department of Chemistry, Jai Prakash University, Chapra - 841301 (India)
DOI : http://dx.doi.org/10.13005/msri/030217
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The Electronic absorption spectra of Co-phthalocyanine (CoPc) have been recorded with a view to study the solvent-solute interaction, H-bonding effect and its protonation in the solvents of different polarity especially in sulphuric acid of different strength. The study revealed that the CoPc acts as a weak monoacidic base in aqueous acidic solution. The hypsochromic shift of lmax was observed when concentration of sulphuric acid decreased from 36N to 6N suggesting the formation of H-bonding of H2S2O7 with atom N(2), N(3) and N(4) of CoPc and extra cyclic monoprotonation occurred irrespective to the concentration of H2SO4.
KEYWORDS:Phthalocyanines; protonation; solvation; H-bonding and hypsochromic shift
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609 Accepted on: 20 Dec 2005
