Home
Resources
Publications
Hydration of Sulphobetaine and Tetra(ethylene Glycol)-Terminated Self-Assembled Monolayers Studied by Sum Frequency Generation Vibrational Spectroscopy

Hydration of Sulphobetaine and Tetra(ethylene Glycol)-Terminated Self-Assembled Monolayers Studied by Sum Frequency Generation Vibrational Spectroscopy

M Jeanette Stein, Tobias Weidner, Keith McCrea, David G Castner, Buddy D Ratner

J Phys Chem B. 2009 Aug 20;113(33):11550-6.

PMID: 19639981

Abstract:

Sum-frequency generation (SFG) vibrational spectroscopy is used to study the surface and the underlying substrate of both homogeneous and mixed self-assembled monolayers (SAMs) of 11-mercaptoundecyl-1-sulphobetainethiol (HS(CH(2))(11)N(+)(CH(3))(2)(CH(2))(3)SO(3)(-)) and 1-mercapto-11-undecyl tetra(ethylene glycol) (HS(CH(2))(11)O(CH(2)CH(2)O)(4)OH) with an 11-mercapto-1-undecanol (HS(CH(2))(11)OH) diluent. SFG results on the C-H region of the dry and hydrated SAMs gave an in situ look into the molecular orientation and suggested an approach to maximize signal-to-noise ratio on these difficult to analyze hydrophilic SAMs. Vibrational fingerprint studies in the 3000-3600 cm(-1) spectral range for the SAMs exposed serially to air, water, and deuterated water revealed that a layer of tightly bound structured water was associated with the surface of a nonfouling monolayer but was not present on a hydrophobic N-undecylmercaptan (HS(CH(2))(10)CH(3)) control. The percentage of water retained upon submersion in D(2)O correlated well with the relative amount of protein that was previously shown to absorb onto the monolayers. These results provide evidence supporting the current theory regarding the role of a tightly bound vicinal water layer in the protein resistance of a nonfouling group.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
LS777213	(11-Mercaptoundecyl)tetra(ethylene glycol)			Price

As a specialist in analytical chemical Products, Alfa Chemistry offers consumers a wealth of raw materials and a full range of technologies and services.

QUICK LINKS

HEADQUARTERS

Tel:

Fax:

Email: