J-Aggregation of Zinc 31,131-Dihydroxychlorins by Exclusive Coordination Bonding between 31-Hydroxy Group and Central Zinc Atom
Zinc 3 1 ,13 1 -dihydroxychlorin lacking an exo-five-membered E-ring was prepared as a model of natural bacteriochlorophyll-d possessing 3 1 -OH and 13-C=O groups. The synthetic zinc complex has the 13-CH 2 OH instead of the 13-C=O and self-aggregated in a nonpolar organic solvent, giving slipped and π-overlapped molecular stackings (J-aggregates) with red-shifted and broadened electronic absorption bands. For the intermolecular interactions among the J-aggregates, coordination bonding of the 3 1 -OH (not 13 1 -OH) with the central Zn was utilized.