Influence of Dielectric Constant on Spectral Behaviour of Cobalt - Phthalocyanine

K. P. Srivastava* and Ashwini Kumar

Physical Chemistry Laboratory, Department of Chemistry, Jai Prakash University, Chapra - 841301 (India)

DOI : http://dx.doi.org/10.13005/msri/030217

ABSTRACT:

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

Copy the following to cite this article: Srivastava K. P, Kumar A. Influence of Dielectric Constant on Spectral Behaviour of Cobalt - Phthalocyanine. Mat.Sci.Res.India;3(2)

Copy the following to cite this URL: Srivastava K. P, Kumar A. Influence of Dielectric Constant on Spectral Behaviour of Cobalt - Phthalocyanine. Mat.Sci.Res.India;3(2). Available from: http://www.materialsciencejournal.org/?p=3387

---

This work is licensed under a Creative Commons Attribution 4.0 International License.