Solvation and dynamic behavior of cyclodextrins in dimethyl sulfoxide solution.
High-frequency dielectric relaxation behavior up to 20 GHz was investigated for plain (alpha, beta, gamma) and (62 and 100%) methylated cyclodextrins, CDs, in dimethyl sulfoxide, DMSO, solution. Each hydrogen atom of OH groups of the CDs solvated a DMSO molecule for a residence time of 130-180 ps due to the hydrogen bond formation to an oxygen atom of DMSO, and a few DMSO molecules were included in cavities of the CDs for a while similar to the residence time. The overall rotational relaxation modes of solvated CDs were also observed depending on the effective sizes of the solvated CDs.
Shikata
Toshiyuki
T
Department of Macromolecular Science, Osaka University, Toyonaka, Osaka 560-0043, Japan. shikata@chem.sci.osaka-u.ac.jp
Takahashi
Rintaro
R
Onji
Takeshi
T
Satokawa
Yuichi
Y
Harada
Akira
A
D002627:Chemistry, Physical / Q000379:methods*; D003505:Cyclodextrins / Q000737:chemistry*; D004121:Dimethyl Sulfoxide / Q000737:chemistry*; D004563:Electrochemistry / Q000379:methods; D006859:Hydrogen / Q000737:chemistry; D006860:Hydrogen Bonding; D008968:Molecular Conformation; D010100:Oxygen / Q000737:chemistry; D012996:Solutions; D013696:Temperature
D003505:Cyclodextrins; D012996:Solutions; D006859:Hydrogen; D010100:Oxygen; D004121:Dimethyl Sulfoxide