Organizing co mmittee

IR-SPECTROSCOPIC ANALYSIS OF THE COMPLEX 
COMPOUND OF ZINC NITRATE WITH BENZAMIDE 
 
L.A. Sharipova
1
, F.Q.Mamatova
1
, M.R.Ibragimova
2
, T.A.Azizov
2
 
 
1) Jizzakh Polytechnic Institute,
2) IGIC AS Ruz 
 
It is known that as humanity develops, science and technology advances, and the 
population increases worldwide, the demands of people for water, clean air, land 
resources, and food are increasing. Today, the demand for environmentally friendly, 
natural and safe products has increased. 
One such method is the mechanochemical method, which does not require different 
solvents either in the synthesis stage or in cases of extraction of the main product. A 
steel ball with a diameter of 20 mm and a mass of 67 grams was used for the 
mechanochemical reaction in a ball mill. In the synthesis of complex compound of zinc 
nitrate, at the beginning of mixing, the substances come to the same homogeneous state 
(liquid state), that is, molecules of crystallization water are separated and ligand 
molecules are coordinated instead. During 7-9 cycles of mixing, it becomes sticky. 
When mixing was continued, it became a dry powder in 15-17 cycles. To synthesize the 
complex compound, zinc nitrate and benzamide were taken in 1:2 molar ratio.
Absorption areas of IR spectra were recorded on a spectrometer IR Tracer-100 (500-
4000 cm
-1
) of "SHIMADZU" company. In the IR spectrum of the complex compound 
[ZnL
8
2
∙(NO
3
)
2
]∙H
2
O, it can be seen that the frequency of the C=O valence vibration of 
the benzamide molecule has decreased from 1659 cm
-1
to 1643 cm
-1
. And the frequency 
of C–N bond valence vibration in benzamide molecule increased from 1450 cm
-1
to 
1486 cm
-1
. Hence, it showed that the benzamide molecule is coordinated through the 
oxygen atom of the carbonyl group. In the IR spectrum of the uncoordinated benzamide 
molecule, the ring vibration is observed at 1577 cm
-1
, which increased to 1604 cm
-1
in 
the complex state (Fig.1). In the region of 3350 cm
-1
, an absorption line corresponding 
to the crystallization water molecule in the complex compound was observed. 
Figure 1. IR spectrum of complex compound [ZnL
8
2
∙(NO
3
)
2
]∙H
2
O 
4
1
0
,0
8
5
2
1
,4
3
6
2
6
,1
1
6
8
3
,4
1
7
6
9
,2
2
8
1
4
,9
6
1
0
0
0
,3
6
1
0
2
4
,5
5
1
1
0
8
,7
5
1
1
4
2
,5
5
1
3
0
0
,6
1
1
3
9
6
,5
4
1
4
8
6
,2
6
1
5
5
5
,3
9
1
6
0
3
,9
9
1
6
4
2
,5
9
2
3
4
0
,8
1
2
3
5
9
,8
2
3
2
3
4
,3
7
3
3
5
0
,4
7
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П
ро
пу
с
ка
ни
е
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Во лно вое ч ис л о (с м- 1)

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Poster presentation 
229