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Research has been conducted on organogel systems. The authors have investigated the relationship between the structure and aggregation mode of these systems via the synthesis of gelators which possess porphyrin moiety as an aggregation unit and amide groups as hydrogen-bonding sites, and report the results.

A porphyrin which assembles into a two-dimensional sheet structure by the hydrogen-bonding interaction among the peripheral urea groups has been designed. Introduction of triethoxysilyl groups into the terminal groups has enabled us to immobilize this novel porphyrin-based cluster by sol-gel polycondensation. [ABSTRACT FROM AUTHOR]

Stimuli responsiveness promises accessibility for designing and constructing new functional materials such as sensors, actuators, and molecular devices. One of the advantages for using low-molecular-weight gels is their reversibility and sharp sol-gel phase transition as a result of thermal stimuli. Such unique behaviors are due to the fashion of their assembly in that they consist of low-molecular-weight compounds self-assembled into complex three-dimensional networks and that their aggregation into fibrous superstructures is driven by multiple, weak interactions such as dipole-dipole, van der Waals, and hydrogen-bonding interactions.

Investigates the carbon[sub 60] fullerene-motivated organogel formation in a porphyrin derivative bearing programmed hydrogen-bonding sites. Estimation of the stoichiometry of carbon[sub 60]; Measurement of the large binding constants from a cyclic bisporphyrin system.