Photoinduced Electron Transfer in Host-Guest Complexes of 2-Naphthyl-O(CH2)
n
-adamantanamines with Mono-6-O-p-nitrobenzoyl-β-cyclodextrin and Mono-6-O-m-nitrobenzoyl-β-cyclodextrin |
| |
Authors: | HUI-YUAN HU MAN-ZHOU ZHU ZHI-PING ZHANG GUO-TAO WEN QING-XIANG GUO |
| |
Institution: | (1) Department of Chemistry, University of Science and Technology of China, 230026 Hefei, P. R. China |
| |
Abstract: | A number of naphthalene derivatives containing adamantanamine binding moiety and an (CH2)
n
(n=2, 3, 4, 5, 6) spacer were prepared as the electron donor. A supramolecular assembly was fabricated by the inclusion between the donor substrates and the host molecules, i.e., mono-6-O-p-nitrobenzoyl-β-cyclodextrin (pNBCD) and mono-6-O-m-nitrobenzoyl-β-cyclodextrin (mNBCD), in water. The fluorescence quenching in these systems was studied in detail. It revealed efficient photoinduced electron transfers (PET) between the naphthalene donors and the cyclodextrin acceptors. This PET process was partitioned into a dynamic quenching component caused by bimolecule collision reactions and a static quenching component due to hydrophobic binding between the donor and acceptor molecules. Detailed Stern–Volmer constants were measured and they were partitioned into dynamic Stern–Volmer quenching constants (dynamic quenching) and static binding constants (static quenching). In these two pathways, the static quenching was found to be highly efficient and dominant in the presence of NBCD. |
| |
Keywords: | cyclodextrin fluorescence quenching photoinduced electron transfer supramolecule |
本文献已被 SpringerLink 等数据库收录! |
|