Complexation of borate with polyd(1-(acrylamido)-1-deoxylactitol): Dilute solution viscosity, 11B NMR, and 13C NMR studies

Mark E. Wilson, Samir Najdi, John M. Krochta, You Lo Hsieh, Mark J. Kurth

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

The interaction of borate ions with poly(1-(acrylamido)-1-deoxylactitol) (PACL) in aqueous media was investigated. Dilute solution viscometry revealed that low concentrations of Borax (Na2B4O7) increased the intrinsic viscosity of PACL, while higher concentrations reduced it. 11B NMR spectra of borate complexes of methyl Β-D-galactopyranoside (MΒDGP) (taken to model the C-1′ through C-6′ portion of the PACL repeating unit) and the monomer 1-(acrylamido)-1-deoxylactitol (2) showed evidence for α,Β-bidentate, α,Β-dimer, and α,γ-bidentate borate complexes. The 11B NMR spectrum of PACL-borate showed α,Β-bidentate and α,Β-dimer only. The binding constants for the α,Β-bidentate and α,Β-dimer complexes were determined for MΒDGP and 2 by integration of the 11B NMR signals. 13C NMR was used to identify the putative sites of complexation on PACL by comparing the spectra of borate complexes of MΒDGP and 2 with PACL-borate. Complexation was found to occur predominantly at the C-6′, C-4′, and C-3′ positions.

Original languageEnglish (US)
Pages (from-to)4486-4492
Number of pages7
JournalMacromolecules
Volume31
Issue number14
StatePublished - Jul 14 1998

ASJC Scopus subject areas

  • Materials Chemistry

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    Wilson, M. E., Najdi, S., Krochta, J. M., Hsieh, Y. L., & Kurth, M. J. (1998). Complexation of borate with polyd(1-(acrylamido)-1-deoxylactitol): Dilute solution viscosity, 11B NMR, and 13C NMR studies. Macromolecules, 31(14), 4486-4492.