Rayleigh light scattering study on the supramolecular interactions of beta-cyclodextrin derivatives with tetrakis(4-methoxylphenyl)porphyrin.
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.
Yang
Ronghua
R
College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Li
Ke'an
K
Wang
Kemin
K
Liu
Feng
F
Li
Na
N
Zhao
Fenglin
F
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
D003505:Cyclodextrins; D011166:Porphyrins; D047392:beta-Cyclodextrins; C021096:tetra(4-N-methylpyridyl)porphine; C031215:betadex