Diastereomerically pure 2,5-piperazinedione-bridged meso-tetraarylporphyrin dimers were synthesized with easy procedures. 1H NMR, UV-vis, and CD spectra showed that porphyrin moieties in the l,l-molecule interacted more strongly than those in the d,l-isomer and this interaction decreased with substitution by 3,5-di-t-butyl groups on the meso-phenyl substituents.
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Tamiaki et al. (1993) studied this question.
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