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Table 1:

Infrared band position (cm-1) and assignment of pure methylammonium methylcarbamate (C) at 10 K, pure methylammonium glycinate (G) at 10 K, pure methylamine at 10 K and pure methylcarbamic acid.
Vibration [CH3NH3+][CH3NHCOO-] [CH3NH3+][NH2CH2COO-] CH3NH2 CH3NHCOOH
  (C) $^{\footnotesize {1}}$ (G) $^{\footnotesize {2}}$ Methylamine $^{\footnotesize {3}}$ Methylcarbamic acid $^{\footnotesize {4}}$
$\nu $ NH H bonding $\cdots$ $\cdots$ $\cdots$ 3367
$\nu_{\rm as}$ NH2 $\cdots$ 3340 3343 $\cdots$
$\nu $ NH 3287 $\cdots$ $\cdots$ $\cdots$
$\nu_{\rm s}$ NH2 $\cdots$ 3285 3282 $\cdots$
H bonding $\cdots$ 3210 3182  
$\nu $ OH $\cdots$ $\cdots$ $\cdots$ 3062/2985
$\nu_{\rm s}$ NH3 CH3NH3+ 3002 3005 $\cdots$ $\cdots$
Combination CH3NH3+ 2642 2651 $\cdots$ $\cdots$
Combination CH3NH3+ 2544 2549 $\cdots$ $\cdots$
$\nu $ C=O $\cdots$ $\cdots$ $\cdots$ 1679/1672
$\delta_{\rm as}$ NH3 CH3NH3+ 1652 1655 $\cdots$ $\cdots$
$\delta$ NH2 $\cdots$ 1635 1615 $\cdots$
$\nu $ CN + $\delta$ NH $\cdots$ $\cdots$ $\cdots$ 1574/1533
$\nu_{\rm as}$ COO- 1578 1565 $\cdots$ $\cdots$
$\delta$ NH 1494 $\cdots$ $\cdots$ $\cdots$
$\delta_{\rm as}$ CH3 CH3NH3+ 1471 1471 $\cdots$ $\cdots$
$\delta_{\rm d}$ CH3 1347 $\cdots$ 1478/1455 1441/1420
$\delta$ CH2 $\cdots$ 1442 $\cdots$ $\cdots$
$\nu_{\rm s}$ COO- 1410 1403 $\cdots$ $\cdots$
$\delta$ OH $\cdots$ $\cdots$ $\cdots$ 1396
tw NH2 $\cdots$ 1330 1339 $\cdots$
tw CH2 $\cdots$ 1310 $\cdots$ $\cdots$
$\delta$ OH + $\nu $ C-O $\cdots$ $\cdots$ $\cdots$ 1315/1263
References. (1) (Waldron 1953; Bossa et al. 2008a; Castellucci 1974; Cabana & Sandorfy 1962); (2) (Rosado et al. 1998); (3) (Durig et al. 1968; Bossa et al. 2008a); (4) (Bossa et al. 2008a).
Comments: Vibration mode: stretching ($\nu $), bending ($\delta$) and twisting (tw).
Indication: asymmetric (as), symmetric (s) and degenerated (d).

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