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Official Journal of the Japan Wood Research Society

Journal of Wood Science Cover Image

Table 1 Assignments of near-infrared (NIR) second derivative spectra of wood

From: Determination of physical and chemical properties and degradation of archeological Japanese cypress wood from the Tohyamago area using near-infrared spectroscopy

  Wavenumber (cm−1) Assignment Component Wavenumber from reference [23] (cm−1)
1 7040 Not assigned
2 7020–6998 1st OT O–H str. + H2O Amorphous regions in cell., water 7003–6993
3 6930 1st OT O–H str. Lignin  
4 6795 1st OT O–H str. Semi crystalline region in cell. 6790
5 6720 1st OT O–H str. Semi crystalline region in cell. 6740–3700
1st OT O–H str. Intramolecular H-bond in cell. ≈ 6715
6 6595 Not assigned
7 6450 1st OT O–H str. Crystalline regions in CI, O(3)-H(3)…O(5) intrachain H-bond, crystalline cell. 6460
1st OT O–H str. Crystalline regions in CI, O(3)-H(3)…O(5) intrachain H-bond, crystalline cell. 6334
8 6290 1st OT O–H str. Crystalline cell. II 6307–6267
Strong O(2)-H(2)…O(6) of cell. 6300–6295
Crystalline region in cell. 6281
9 6120 Not assigned
10 6012–5980 1st OT O–H str. Hemi. 6003
1st OT Carm–H str. Lig. 5980, 5974, 5963, 5978
11 5902–5885 1st OT O–H str. 5900
1st OT C–H str. Lig. 5890
1st OT C–H str. Cell. 5872
1st OT O–H str. Hemi. 5865
12 5807 − 5803 1st OT O–H str. Lig./hemi./cell. 5814, 5816
Hemi. 5800
Lig. 5795
13 5738 Not assigned
14 5475 O–H str. + 2nd OT C–O Cell. 5495
O–H str. + 2nd OT C–O Semi crystalline or crystalline region in cell. 5464
15 5228–5215 2nd OT C = O str. Hemi. 5245, 5236
O–H asym. str. + O–H def. of water Water 5220–5150
16 4414–4402 O–H str. + C–O str. Lig. 4411
O-–H str. + C–O str. Cell. 4405
C–H2 str. + C–H2 def. Cell./hemi. 4404
C–H str. + C–H def. Hemi. 4401
O–H str. + C–C str. And/or C–H str. +C–H def. Cell. 4392
17 4287 C–H str. + C–H def. Hemi. 4296–4288
C–H str. + C–H def. Cell./hemi. 4283
4281
C–H str. + C–H2 def. Lig. 4280
C–H str. + C–H2 def. Cell. 4277
18 4208–4200 2nd OT O–H def. Holo. 4202
Not assigned Lig. 4195
  1. OT overtone, asym. asymmetric, str. stretching vibration, bend bending vibration, def. deformation vibration
  2. Lig. lignin, Holo. holocellulose, Hemi. hemicellulose, Cell. cellulose