NMR investigation of methyl-2,4-dimethoxysalicylate: effect of solvent and temperature

Spectrochim Acta A Mol Biomol Spectrosc. 2006 Jul;64(4):1077-82. doi: 10.1016/j.saa.2005.09.018. Epub 2006 Feb 2.

Abstract

(1)H NMR and (13)C NMR of methyl-2,4-dimethoxysalicylate 2 was measured in chloroform-d at the temperature range of 220-330 K, in dimethyl sulfoxide-d(6) at the temperature range of 300-400 K and in a polar protic solvent (CD(3)OD) at 300 K. The structure of 2 in liquid phase (solvent) is compared with those in solid phase (X-ray) and in the gas phase (quantum mechanical calculations). The relationship between molecular geometry, (1)H NMR chemical shift and W coupling of involved protons has a complex nature, but hydrogen bonds [C=O...H-O and C=O...H-CH(2)O] strength is the principle factor.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Crystallography, X-Ray
  • Hydrogen Bonding
  • Magnetic Resonance Spectroscopy / methods*
  • Models, Chemical
  • Models, Molecular
  • Salicylates / analysis
  • Salicylates / chemistry*
  • Solvents / chemistry*
  • Temperature

Substances

  • Salicylates
  • Solvents