Influence of solvent and salt concentration on the alignment properties of acrylamide copolymer gels for the measurement of RDC | Zendy

TrigoMouriño Pablo | Zendy; NavarroVázquez Armando | Zendy; SánchezPedregal Víctor M. | Zendy

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Influence of solvent and salt concentration on the alignment properties of acrylamide copolymer gels for the measurement of RDC

Author(s) -

TrigoMouriño Pablo,

NavarroVázquez Armando,

SánchezPedregal Víctor M.

Publication year - 2012

Publication title -

magnetic resonance in chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.483

H-Index - 72

eISSN - 1097-458X

pISSN - 0749-1581

DOI - 10.1002/mrc.3889

Subject(s) - chemistry , copolymer , solvent , salt (chemistry) , sodium , aqueous solution , acrylamide , residual dipolar coupling , ion , sodium salt , polyacrylamide , chloride , polymer chemistry , dipole , inorganic chemistry , polymer , organic chemistry

The dependence of molecular alignment with solvent nature and salt concentration has been investigated for mechanically stretched polyacrylamide copolymer gels. Residual dipolar couplings (RDCs) were recorded for D 2 O, DMSO‐ d 6 , and DMSO‐ d 6 /D 2 O solutions containing different proportions of the solvents and different sodium chloride concentrations. Alignment tensors were determined by fitting the experimental RDCs to the DFT‐computed structure of N ‐methylcodeinium ion. Analysis of the tensors shows that the degree of alignment decreases with the proportion of DMSO‐ d 6 as well as with the concentration of sodium chloride, most likely due to enhanced ion‐pair aggregation. Furthermore, rotation of the alignment tensor is observed when increasing the salt concentration. Copyright © 2012 John Wiley & Sons, Ltd.

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