A question of orientation: The self-assembly of a dialkynylene-bridged zinc pyridylporphyrin dimer with rotational freedom preferentially leads to a cyclic tetramer consisting of the perpendicular conformer (⊥), rather than the more usual planar conformer ( // , see picture). This preference most likely arises from an efficient cancellation of dipole moments in the self-assembled structure.
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Tsuda et al. (2005) studied this question.
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