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 |