Construction of Porphyrin Array by Molecular Recognition Funcitonality.

Accession number;99A0228205
Title;Construction of Porphyrin Array by Molecular Recognition Funcitonality.
Author; KURODA YASUHISA (Kyoto Inst. of Technol.) SUGO KENJI (Kyoto Inst. of Technol.) MATSUYAMA AKIKO (Kyoto Inst. of Technol.) SASAKI KEN (Kyoto Inst. of Technol.)
Journal Title;Abstracts. Symposium on Biofunctional Chemistry
Journal Code:L0836A
ISSN:
VOL.13th;NO.;PAGE.49-51(1998)
Figure&Table&Reference;
Pub. Country;Japan
Language;Japanese
Abstract;We report herein new self-organized multi-porphyrin array systems using molecular recognition between doubly bridged porphyrin(P) and tartrate esters. We used dimeric (TT), and trimeric (TTT) tartrate esters as templates on which the porphyrin molecules may be linearly arranged along their tartrate moieties. In order to confirm the formation of the porphyrin array systems, the variable-temperature electronic spectra of the mixture of P and the templates were measured. The TT-P and TTT-P systems exhibit unique split Soret band at 437nm and 440nm upon allowing the temperature of the samples to lower. The exciton splitting energies are evaluated to be 507cm-1 and 691cm-1 for the TT-P and TTT-P systems respectively. The detailed analyses of the data of variable-temperature UV-vis spectra gave the .DELTA.H and .DELTA.S values for 1:1, 1:2 and 1:3 complexes between the templates and P to be -15.2.+-.0.8Kcal/mole, -27.+-.3e.u., -10.4.+-.0.8Kcal/mole, -10.+-.3e.u. and -9.6.+-.0.9Kcal/mole, -8.+-.4e.u., respectively. (author abst.)
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