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Official Journal of the Japan Wood Research Society

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