title: Rayleigh light scattering study on the supramolecular interactions of beta-cyclodextrin derivatives with tetrakis(4-methoxylphenyl)porphyrin.
abstract: The supramolecular interactions of beta-cyclodextrin(beta-CD) and four kinds of alkylated beta-cyclodextrin (beta-CDs), i.e. heptakis (2,6-di-O-isobutyl)-beta-cyclodextrin (Ob-beta-CD), heptakis (2,6-di-O-n-octyl)-beta-cyclodextrin (Oc-beta-CD), heptakis (2,6-di-O-n-dodecyl)-beta-cyclodextrin (Od-beta-CD) and heptakis (2,6-di-O-n-hexadecyl)-beta-cyclodextrin (Oh-beta-CD) with tetrakis(4-methoxylphenyl)porphyrin (TMOPP) have been investigated by Rayleigh light scattering (RLS) technique. Beta-CDs form 2:1 inclusion complex with TMOPP following an obvious RLS enhancement of TMOPP. The inclusion abilities of different beta-CDs were compared. The results show that the inclusion ability of beta-CDs is related to the size of the alkylated substituent. Thus, a new mechanism of inclusion interaction has been proposed. The exact stoichiometric ratios and the association constants of the inclusion complexes have been examined by application of curve fitting method.
authors.affiliation: College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
authors.forename: Ronghua
authors.initials: R
authors.lastname: Yang
authors.forename: Ke'an
authors.initials: K
authors.lastname: Li
authors.forename: Kemin
authors.initials: K
authors.lastname: Wang
authors.forename: Feng
authors.initials: F
authors.lastname: Liu
authors.forename: Na
authors.initials: N
authors.lastname: Li
authors.forename: Fenglin
authors.initials: F
authors.lastname: Zhao
mesh_terms: D003505:Cyclodextrins / Q000032:analysis* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008027:Light; D008956:Models, Chemical; D011166:Porphyrins / Q000032:analysis* / Q000737:chemistry; D012542:Scattering, Radiation; D013050:Spectrometry, Fluorescence / Q000379:methods*; D047392:beta-Cyclodextrins
chemical_list: D003505:Cyclodextrins; D011166:Porphyrins; D047392:beta-Cyclodextrins; C021096:tetra(4-N-methylpyridyl)porphine; C031215:betadex