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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