In:
Journal of Porphyrins and Phthalocyanines, World Scientific Pub Co Pte Ltd, Vol. 22, No. 01n03 ( 2018-01), p. 102-111
Abstract:
Molecular aggregation phenomena of a highly water-soluble, metal-free phthalocyanine, H[Formula: see text]Pc, and its copper complex, Cu(Pc); where Pc denotes tetrakis{(2[Formula: see text] ,6[Formula: see text]-dimethyl-4[Formula: see text] -sulfonic acid)phenoxy}phthalocyaninate) in water, ethanol, and their mixed solvent systems have been investigated by spectroscopic approach In both aqueous and ethanolic solutions, H[Formula: see text]Pc molecules aggregate in a slipped-cofacial manner, although very weakly in ethanol. On the other hand, Cu(Pc) molecules aggregate in a cofacial manner in water while aligning in a slipped-cofacial manner in ethanol. Magnetic circular dichroism spectroscopy was undertaken to investigate aggregation behaviors of Cu(Pc) in water and ethanol. Presence of 4-phenylpyridine in ethanol effectively inhibited aggregation of Cu(Pc) molecules, although little affected the spectra of the monomers. In a mixed solvent system, where water/ethanol [Formula: see text] 10/90 (v/v), Cu(Pc) is free from aggregation up to almost 10[Formula: see text] M. Driving forces of this molecular aggregation are discussed on the basis of [Formula: see text] –[Formula: see text] interaction and coordination chemistry involving copper ions.
Type of Medium:
Online Resource
ISSN:
1088-4246
,
1099-1409
DOI:
10.1142/S1088424618500141
Language:
English
Publisher:
World Scientific Pub Co Pte Ltd
Publication Date:
2018
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