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International Journal of Phytomedicine and Phytotherapy

Table 4 Band Assignments and absorption bands of undoped and A. marmelos added CHPD crystals

From: Effect of Aegle marmelos on the growth of brushite crystals

Sl. No Observed IR frequencies wavenumbers (cm− 1) Band Assignments
Undoped CHPD CHPD: 50 mg A. marmelos
1 3729.42 3721.99 Weakly H bonded OH vibrations
2 3544.92 3544.92 Weakly H bonded OH vibrations
3 3488.99 3488.02 Weakly H bonded OH vibrations
4 3277.8 3278.76 Weakly H bonded OH vibrations
5 3162.08 3162.08 Weakly H bonded OH vibrations
6 2925.11 2928.41 OH stretching vibrations
7 2384.82 2385.6 Weak absorption HPO42−
8 2348.48 2346.83 PO-H symmetric stretching vibrations
9 2304.76 2304.76 O=P-OH Stretching vibrations
10 2124.93 2124.93 O=P-OH Stretching vibrations
11 1729.06 1729.06 Weak absorption HPO42−
12 1649.02 1648.06 H-O-H Symmetric bending vibrations
13 1511.18 1509.53 P=O stretching vibrations
14 1455.05 1454.26 P=O stretching vibrations
15 1394.86 1364.34 P=O asymmetric stretching vibrations
16 1337.94 1338.77 P=O asymmetric stretching vibrations
17 1218.93 1215.07 PO4 P=O associated Stretching vibrations
18 1136.96 1136.96 PO4 P=O associated Stretching vibrations
19 1061.74 1062.7 P=O Stretching vibrations
20 986.52 987.49 P-O-P asymmetric stretching bond
21 935.38 P-OH stretching vibrations
22 873.69 873.69 P-O-P asymmetric stretching bond
23 794.62 795.58 P-O-P asymmetric stretching bond
24 660.57 656.72 (H-O-) P=O bond (strong absorption) acid phosphates
25 577.64 577.64 (H-O-) P=O bond (strong absorption) acid phosphates
26 527.49 527.49 (H-O-) P=O bond (strong absorption) acid phosphates