Mughal, Sabeeha, Bezzu, Caterina Grazia, Carter, Emma ![]() ![]() |
Abstract
The spectroscopic behavior of octa-t-butyltetra-2,3-triptycenotetraazaporphyrin and some of its metal complexes (Cu2+, Zn2+ and Co2+) were examined. UV-visible and electron paramagnetic resonance spectroscopy indicate that these phthalocyanine derivatives form cofacial dimers in pentane solution. Modeling suggests that the lowest energy configuration of the dimer is a self-complementary embrace in which the two phthalocyanine cores are staggered at an angle of 45° relative to each other. This configuration results in a remarkably intense and sharp absorption band (~635 nm; ε = ~4.0 × 105 M-1.cm-1) arising from excitonic coupling within the dimer, a unique property for self-assembled dimers but analogous to the behavior of certain μ-oxo-dimers of silicon phthalocyanine. Introduction of methyl substituents into the bridgehead positions of the triptycene subunits prevents dimer formation.
Item Type: | Article |
---|---|
Date Type: | Publication |
Status: | Published |
Schools: | Chemistry |
Subjects: | Q Science > QD Chemistry |
Uncontrolled Keywords: | phthalocyanine; dimer; triptycene |
Publisher: | WorldSciNet |
ISSN: | 1088-4246 |
Last Modified: | 10 Sep 2023 16:51 |
URI: | https://orca.cardiff.ac.uk/id/eprint/47974 |
Citation Data
Cited 2 times in Scopus. View in Scopus. Powered By Scopus® Data
Actions (repository staff only)
![]() |
Edit Item |