摘要:
Cyclodextrin (alpha and beta) based nanostructures formed with 2-aminobenzophenone, 3-aminobenzophenone through the supramolecular self assembly are studied by absorption, fluorescence, time-resolved fluorescence, SEM, TEM, FT-IR, DSC, PXRD and H-1 NMR. The unequal layer by layer nanosheets and nanoribbons are formed through self assembly of 3ABP/CD inclusion complexes. 2ABP/alpha-CD complex nanostructures show the self assembly hierarchical thread structure and beta-CD complexes displays a nanobrick structure. The formation of nanostructures are prearranged to H-O center dot center dot center dot H, NH2 center dot center dot center dot O and H2N center dot center dot center dot H intermolecular hydrogen bond between individual complexes. The absorption and fluorescence spectral changes explicit formation of 1:1 inclusion complexes and solvent study demonstrate the ESIPT and TICT present in both molecules. The thermodynamic parameters (Delta H, Delta G and Delta S) of 2ABP and 3ABP molecule and the inclusion complexes were determined from semiempirical PM3 calculations. (C) 2014 Elsevier B.V. All rights reserved.