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Synthesis of architecturally novel calix4arene phthalocyanines

O'Malley, Shane (2006) Synthesis of architecturally novel calix4arene phthalocyanines. PhD thesis, Dublin City University.

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Abstract

One of the major problems associated with phthalocyanines is their strong tendency to aggregate in both solution and the solid state. As a consequence, their application as sensors, optical filters and as photosensitisers in polar media can be limited. It is the target of this work to prepare a new series of phthalocyanines which possess an isolated core, by isolating the core aggregation between phthalocyanine rings will be eliminated. The strategy employed involved the preparation of a 3 and 4 calix[4]arene substituted phthalonitrile. This was achieved in three steps and interestingly we were able to prepare a partial cone derivative for the 3-calix[4]arene phthalonitrile where the phthalonitrile is within the upper rim of the calix[4]arene. Such an arrangement places two of the t-butyl groups of the calix[4]arene above and below the phthalonitrile ring. Furthermore, this conformation was found to be stable at temperatures in excess of 120°C. On the other-hand the 4-calix[4]arene phthalonitrile gave both a partial cone and cone conformation. We found that the 4-calix[4]arene phthalonitrile could be readily self-condensed to the tertacalix[4]arenephthalocyanine in good yields, on the other hand the 3- calix[4]arene phthalonitrile only yielded traces o f the phthalocyanine on selfcondensation, and this is due to steric congestion. The 3-calix[4]arene phthalonitrile was then cross-condensed with phthalonitrile to give the unsymmetrical monocalix[4]arenephthalocyanine, with the phthalocyanine perched into the upper rim of the calix[4]arene. All calix[4]arene phthalocyanines were studied for aggregational behaviour in both polar solution and the solid state. It was found that the tetracalix[4]arene phthalocyanine does not show any aggregation either in the solid state or solution. The unsymmetricaPperched’ phthalocyanine does not aggregate in polar solution but forms dimers in the solid state. Also reported within the thesis are the synthesis o f a series o f new novel calix[4]arene bridged binuclear phthalocyanines. Their synthesis and properties are discussed.

Item Type:Thesis (PhD)
Date of Award:2006
Refereed:No
Supervisor(s):Nolan, Kieran
Uncontrolled Keywords:phthalocyanines; Sensors; Optical filters; Elimination of core aggregation
Subjects:Physical Sciences > Chemistry
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 3.0 License. View License
ID Code:19176
Deposited On:23 Aug 2013 15:36 by Celine Campbell. Last Modified 23 Aug 2013 15:36

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