Does water liquid phase intrude into hydrophobic nanospaces of alkyl-grafted mesoporous silica immersed in water? Detection by13C CP-MASNMR

Chemistry Letters

Volumn 39, Issue 11, 2010, Pages 1215-1217

  Inumaru, Kei ^a   Kakii, Shintaro ^a   Yoshida, Hiroto ^a   Yamanaka, Shoji ^a  

^a HIROSHIMA UNIVERSITY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 78449278526     PISSN: 03667022     EISSN: 13480715     Source Type: Journal    
DOI: 10.1246/cl.2010.1215     Document Type: Article

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42. In order to check how the methyl signal shifts when the alkyl chains are surrounded by water molecules, NMR spectra of neat and 1.7% aqueous solution of 1-pentanol were compared. Chemical shifits of carbon 1 were very close (61.99 and 62.06 ppm for the neat compound and aqueous solution, respectively). The methyl peak in aqueous solution gave a signal at slightly higher field (13.42 ppm) than that of neat compound (14.02 ppm). The peak shift was small and opposite to signal a.