Role of entropy in supramolecular photochirogenesis: enantiodifferentiating photoisomerization of cyclooctenes in chiral sensitizer-immobilized MCM-41 cavities

Autor:	Masakazu Iwamoto, Yoshihisa Inoue, Takehiko Wada, Tadashi Mori, Ryo Maeda, Atsushi Kusaka
Rok vydání:	2011
Předmět:	Entropy (classical thermodynamics) Photoisomerization MCM-41 Homogeneous Chemistry Supramolecular chemistry Physical and Theoretical Chemistry Optically active Photochemistry Mesoporous silicate
Zdroj:	Photochemicalphotobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology. 10(9)
ISSN:	1474-9092
Popis:	To examine the effects of confinement, or low-entropy environments, we employed the mesoporous silicate MCM-41 modified with optically active benzenetetracarboxylates as chiral reaction media to effect the enantiodifferentiating photoisomerization of (Z)-cyclooctene and (Z,Z)-1,5-cyclooctadiene. The ee of the (E)-isomer produced and its temperature dependence behavior in MCM-41 were completely different from those observed in homogeneous solutions. Immobilizing the sensitizer in MCM-41 reduced the contribution of the entropy factor.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a1d24103997133ccfdfb5ba608697909 https://pubmed.ncbi.nlm.nih.gov/21655623 Zobrazit plný text záznamu Full text from SpringerLink