Complex compounds of acetates of divalent cobalt, copper and zinc with trimethylolthiocarbamide Текст научной статьи по специальности «Химические науки»

Isakov Hayatulla,

candidate of technical sciences, assistant professor of the Department of Chemistry, Andijan State University

Uzbekistan, Andijan E-mail: xayotilla.isakov@bk.ru

Abdurahimova Nodira, master of Andijan State University, Uzbekistan, Andijan Askarov Ibrahim Rahmanovich, doctor of Chemical Sciences, Professor, Department of Chemistry, Andijan State University

Uzbekistan, Andijan

Usmanov Sulton,

doctor of technical sciences, professor, head of laboratories JSC AB Bekturov Institute of Chemical Sciences,

Kazakhstan, Almaty Azizov Tohir Azizovich, doctor of Chemical Sciences, Professor, Head of Laboratory Institute of General and Inorganic Chemistry.

Uzbekistan, Tashkent

COMPLEX COMPOUNDS OF ACETATES OF DIVALENT COBALT, COPPER AND ZINC WITH TRIMETHYLOLTHIOCARBAMIDE.

Abstract: In this paper, the results are presented by synthesizing the study of complex compounds of divalent cobalt acetate, copper and zinc with trimethylolthiocarbamide.

Keywords: Trimethylolthiocarbamide, metal acetates, IR spectrum, synergistic effect, derivato-gram, thermolysis, peak, thermal effect.

Introduction

The creation of new chemicals for the use of agriculture is one of the topical problem of chemists - inorganics. Thiocarbamide its derivatives have biologically active effects, in particular, stimulate plant growth. Due to the synergistic effect of the complexes of microelements with thiocarbamide, its derivatives have a higher activity than the sum of the original components.

Previously, we studied the complex compound of cobalt, copper and zinc acetates with dimethyl-olthiocarbamides.

Objects and methods of research

In the present work, the results of synthesis and investigation of coordination compounds of acetates of divalent cobalt, copper and zinc with trimethylolthiocarbamide are given. Trimethylolthiocarba-mide is obtained by reacting thiourea with formaldehyde at pH 8.0-8.5 according to [4].

Coordination compounds of cobalt, copper and zinc acetates were synthesized by the interaction of saturated aqueous solutions of metal acetates and trimethylolthiovcarbamide at a molar ratio of 1: 1, followed by precipitation at room temperature. The

precipitate formed is filtered off, dried in a vacuum desiccator over P2O5.

The obtained compounds were analyzed on an atomic-absorption spectrophotometer of the Per-kin-Eller firm of the 3030 model, on the Carlo Erba analyzer 1108 (Italy). IR absorption spectra were used to determine the individuality of the synthesized isolated complexes using a two-beam infrared spectrophotometer of the Zeiss IR-20 in the 4004000 cm-1 region.

IR absorption spectra were used to determine the individuality of the synthesized allocated complexes using a two-beam infrared spectrophotometer of the Zeiss IR-20 in the 400-4000 cm-1 region.

Samples were prepared in the form of tablets compressed with KBr.

The thermal analysis was recorded on the de-rivatograph of the Paulik-Paulik-Erdei system [5-6] at a rate of 10 deg / min. and samples - 0.10 g with the sensitivity of galvanometers T-900, TG-100 DTA-1/10, DTG-1/10. The recording was carried out under atmospheric conditions with a constant removal of the gaseous medium by means of a water jet pump. The holder was a platinum crucible with a diameter of 7 mm without a cover. Al2O3 was used as a reference.

Results and their discussion The results of elemental analysis are given in Table 1.

Table 1.- Results of elemental analysis

Compound M% N% S% C% H%

Found Calcu. Found Calcu. Found Calcu. Found Calcu. Found Calcu.

Trimethylolthiocar-bamid (L) - - 17.01 16.87 20.02 19.87 29.04 28.91 5.97 6.02

Co(CH3COO),.L.H,p 16.29 16.33 7.81 7.76 8.93 8.87 26.41 26.59 5.02 4.99

Cu(CH3COO)2-L-H2O 17.29 17.38 7.57 7.66 8.88 8.76 26.31 26.27 4.86 4.92

Zn(CH3COO)2-L.H2O 17.91 17.80 7.69 7.63 9.01 8.72 25.96 26.16 5.01 4.90

Some vibrational frequencies (cm-1) in IR ab- and its complexes with cobalt, copper and zinc ac-sorption spectra of trimethylolthiocarbamide (L) etate are shown in (Table 2).

Table 2.- Some vibrational frequencies (cm-1) in the IR absorption spectra of trimethylolthiocarbamide and its complexes

Trimethylolthio -carbamide (L) Co(CH3COO)2. .L.H2O Cu(CH3COO)2-•L.H2O Zn(CH3COO)2-•L.H2O Absorption

1 2 3 4 5

3483 & (OH)H2O

3359 3286 3294 3305 & (OH)alcohol

3272 3243 3258 & (NH)+2 S (NH)

3044 3098 3143, 3097 3115

2955 2922 2972 2973 &(CH)

2897 2843

1643 crooked 1654 1636 crooked S (NH), S (OH)

1621 1614 1634

1560 1557 1584 &as(COO)

1542 1539 1550 1574,1552

1 2 3 4 5

1521 1521 1540 1538

1457 1447 1464 1452 3s(COO)

1399 1405 3 s(N-C-N)

1423 1417 3 (C-N)

1364 1350 1350 1343 5 s(ch,)

1300 1300 1303

1250 1226 1264 3 (C=S)amide n

1157 1166 1179 1176 5 (NH)

1064 1081 3 (cn)

1026 1022 3 (COH)

988 990, 963 p (CH2)+3 (C-C)aq

897 923 901

939 853 887, 847 3 (C-C)+ p (CH2)

913 804, 720 737 742 p (CHJ

676 673 679 682 5 (COO)

626 623 621

579 532 562 508 5 (N-C=S), 5 (NH)

Comparison of the IR spectra of free trimethyl-olthiocarbamide and the investigated complex compounds shows that the frequencies ofvalence vibrations of OH bonds are mixed into the low-frequency region by 54-73 cm-1. While the assumed C = S bond band at 1250 cm-1 in the case of cobalt decreases by 24 cm-1, and 14 cm-1 is reported for copper, and in the case of zinc disappears. However, the low-frequency band at 579 cm-1 attributed to ^C = S the deformation vibration of the bond in all cases decreases by 17-71 cm-1. These changes indicate

Table 3.- The derivational data of the and its complexes with acetates

that in coordination both the oxygen atoms of the alcohol groups and the sulfur atom of the thioamide group participate.

Derivatographic data of thermolysis of trimethyl-olthiocarbamide and its complexes are given in Table 3. The temperature intervals, the peak of thermal effects, the loss of mass of each effect, the nature of thermal effects and the resulting compounds after each process were determined. It is shown that the thermal behavior of complexes depends on the nature of the metal and the composition of the compounds.

thermolysis of trimethylolthiocarbamide of divalent cobalt, copper and zinc

Compound Temperature range of effect o С Peak effect o С Weight loss Nature of effect, o С Formed compounds

1 2 3 4 5 6

Trimethylolthiocarbamide (l) 135-150 135 5.00 endothermic The thermolysis product L

150-200 160 14.00 endothermic The thermolysis product L

200-288 230 40.00 endothermic The thermolysis product L

288-310 292 5.00 endothermic The thermolysis product L

1 2 3 4 5 6

Trimethylolthiocarba-mide (L) 310-370 355 5.00 exothermic The thermolysis product L

370-420 400 3.00 exothermic The thermolysis product L

420-515 480 6.00 exothermic The thermolysis product L

515-595 570 16.00 exothermic Among the decomposition products L

Co(CH3COO)2.L.H2O 90-130 120 5.11 endothermic Co(CH3COO)2-L

130-200 150 18.59 endothermic The thermolysis product Co(CH3COO)2-L

200-242 215 8.97 exothermic The thermolysis product Co(CH3COO)2-L

242-252 250 18.90 exothermic The thermolysis product Co(CH3COO)2-L

252-300 270 9.62 endothermic The thermolysis product (CH3COO)2-L

300-490 415 8.33 exothermic The thermolysis product Co(CH3COO)2-L

490-610 585 3.20 exothermic The thermolysis product Co(CH3COO)2-L

760-920 820 14.10 exothermic Co^S,

Cu(CH3COO)2-L.H2O 60-120 90 4.85 endothermic Cu(CH3COO)2-L

120-165 140 3.13 endothermic The thermolysis product Cu(CH3COO)2-L

165-198 190 5.73 exothermic The thermolysis product Cu(CH3COO)2-L

198-215 200 7.29 endothermic The thermolysis product Cu(CH3COO)2-L

215-262 235 17.81 exothermic The thermolysis product Cu(CH3COO)2-L

262-360 285 7.60 endothermic The thermolysis product Cu(CH3COO)2-L

360-450 425 2.60 exothermic The thermolysis product Cu(CH3COO)2-L

450-550 520 7.55 exothermic The thermolysis product Cu(CH3COO)2-L

550-585 560 -1.56 exothermic Oxidation of the thermolysis product Cu(CH3COO)2-L

700-770 750 3.43 endothermic CuS+CuSO3

Zn(CH3COO)2-L-H2O 90-130 110 4.89 endothermic Zn(CH3COO)2-L

130-180 150 11.31 endothermic The thermolysis product Zn(CH3COO)2-L

1 2 3 4 5 6

Zn(CH3COO)2-L.H2O 180-280 235 26.73 endothermic The thermolysis product Zn(CH3COO)2-L

280-380 340 11.90 endothermic The thermolysis product Zn(CH3COO)2-L

380-520 425 6.55 endothermic The thermolysis product Zn(CH3COO)2-L

520-600 580 7.74 exothermic Education ZnS

600-760 740 -2.14 exothermic Oxidation ZnS

760-840 820 2.38 endothermic Education ZnO

Conclusion spectroscopy, the composition, thermal behavior

The synthesis conditions were developed, three and methods of coordination of the molecule of

complex compounds of acetates of divalent co- trimethylolthiocarbamide and the acetic acid ion

balt, copper, and zinc with trimethylolthiocarba- are proved. The central atom is surrounded by six

mide were isolated in a solid state. With the help oxygen atoms and has a geometric configuration of

of elemental, derivatographic analysis, vibrational a distorted octahedron.

References:

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