Condensation of 132-oxopyropheophorbide a with benzene-1,2,4,5-tetramine produced a bis-quinoxaline-bridged symmetrical chlorin dimer and an unsymmetrical benzimidazole/pyrazine bridged analog. Spectroscopic data of the novel conjugated dimers show a significant perturbation of the extended bis-chlorin π-system in a coplanar arrangement.
A. N. Kozyrev, J. L. Alderfer, T. Srikrishnan and R. K. Pandey, J. Chem. Soc., Perkin Trans. 1, 1998, 837 DOI: 10.1039/A800609A
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