Polyethyleneoxide‐capped phthalocyanines: limiting phthalocyanine aggregation to dimer formation

The synthesis and characterization of a soluble metal‐free polyethyleneoxide‐capped phthalocyanine and the corresponding lead compound are described. This phthalocyanine was designed to allow the formation of dimers but to inhibit formation of higher aggregates. The monomer/dimer equilibrium constan...

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Bibliographic Details
Published in:Journal of porphyrins and phthalocyanines 2001-07, Vol.5 (7), p.582-592
Main Authors: Dominguez, D. D., Snow, A. W., Shirk, J. S., Pong, R. G. S.
Format: Article
Language:English
Subjects:
aggregation
capped phthalocyanine
phthalocyanine dimer
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Summary:The synthesis and characterization of a soluble metal‐free polyethyleneoxide‐capped phthalocyanine and the corresponding lead compound are described. This phthalocyanine was designed to allow the formation of dimers but to inhibit formation of higher aggregates. The monomer/dimer equilibrium constant in chloroform solutions is 750 ± 20 l mol−1. No evidence for higher aggregates was found. The molecular extinction coefficient of the metal‐free polyethyleneoxide‐capped phthalocyanine in chloroform is one of the lowest known (2.5 × 104 l mol−1 cm−1). The lead‐substituted material was demonstrated to be a reverse saturable absorber from 532 nm to about 610 nm. It possesses a large nonlinear absorption coefficient in the visible and is a promising optical limiter material. Published in 2001 by John Wiley & Sons, Ltd.
ISSN:1088-4246
1099-1409
DOI:10.1002/jpp.365