Covalent Fixation of the Cyclic Tetramer of a Metallo-porphyrin Based on Self-complementary Quadruple Hydrogen Bonding.

The stability of quadruple hydrogen bonding in the cyclic tetramer of a metallo-porphyrin before and after a covalent fixation was investigated. According to competition and energy-transfer experiments, the exchange reaction between the cyclic tetramers of the metallo-porphyrin was fully suppressed by the covalent fixation. This spontaneous cyclization-covalent fixation strategy based on olefin metathesis can open the way to the use of cyclic assemblies in a solid phase. [ABSTRACT FROM AUTHOR]