/ / / Tab 4

Research Article

Investigation of the Orientation of Ions in the Interlayer of CTAB Pillared Montmorillonite

Table 4

Positions and assignments of the IR vibration bands observed in the range of 400–4000 cm⁻¹.


Assignment	Frequency, cm⁻¹
Assignment	Mt	0.5 CEC	1.0 CEC	1.5 CEC	2.0 CEC

Structural OH stretching	3634	3633.09	3633.14	3629.92	3624.39
Symmetric OH stretching ()	3444	3435.98	3435.09	3434.57	3434.74
Asymmetric OH stretching ()	—	—	—	—	—
Asymmetric CH₂ stretching	—	2931.17	2924.2	2919.77	2918.98
Symmetric CH₂ stretching	—	2855.75	2851.49	2850.57	2850.29
H–O–H bending ()	1642	1640.09	1638.01	1637.21	1633.37
CH₂ scissoring	1478	1476	1474.03	1473.07	1472.98
CH₂ scissoring	1442	1440.09	1438.01	1437.21	1433.37
Si–O stretching	1018.43	1000.38	1036	1029	1022
Si–O stretching	1101	1088	914.73	918	914.73
CH₂ rocking	797.47	797.16	797.16	798.08	797.17
CH₂ rocking	779.18	779.43	778.43	779.81	778.80

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