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Table 6 Wavenumbers ν [cm−1] of asymmetric and symmetric carboxylate stretching vibrations of GLU adsorbed on gibbsite, determined by DRIFT spectroscopy

From: Adsorption of aliphatic polyhydroxy carboxylic acids on gibbsite: pH dependency and importance of adsorbate structure

pH GLU on gibbsite GLU on gibbsite—difference spectra
νasymmetric (COO) νsymmetric (COO) νasymmetric (COO) νsymmetric (COO)
4 1644 1393 1643 1397
8 1650 1393 1652 1397
10 1650 1396 1646 1400
12 1630 1393 1626 a
  1. aPeak evaluation impossible