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