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1.
New zinc acetate based complex compounds (of general formula Zn(CH3COO)2·1?2L·nH2O) containing one or two molecules of urea, thiourea, coffeine and phenazone were prepared namely: Zn(CH3COO)2·2.5H2O, Zn(CH3COO)2·2u·0.5H2O, Zn(CH3COO)2·tu·0.5H2O, Zn(CH3COO)2·2tu, Zn(CH3COO)2·cof·2.5H2O, Zn(CH3COO)2·2cof·3.5H2O, Zn(CH3COO)2·2phen·1.5H2O. The compounds were characterized by IR spectroscopy, chemical analysis and thermal analysis. Thermal analysis showed that no changes in crystallographic modifications of the compounds take place during (heating in nitrogen before) the thermal decompositions. The temperature interval of the stability of the prepared compounds were determined. It was found that the thermal decomposition of hydrated compounds starts by the release of water molecules. During the thermal decomposition of anhydrous compounds in nitrogen the release of organic ligands take place followed by the decomposition of the acetate anion. Zinc oxide and metallic zinc were found as final products of the thermal decomposition of the zinc acetate based complex compounds studied. Carbon dioxide and acetone were detected in the gaseous products of the decomposition of the compounds if ZnO is formed. Carbon monoxide and acetaldehyde were detected in the gaseous products of the decomposition, if metallic Zn is formed. It is supposed that ZnO and Zn resulting from Zn acetate complex compounds here studied, possess different degree of structural disorder. Annealing takes place by further heating above 600°C. 相似文献
2.
Katarína Homzová Katarína Győryová Zuzana Bujdošová Daniela Hudecová Mária Ganajová Zuzana Vargová Jana Kovářová 《Journal of Thermal Analysis and Calorimetry》2014,116(1):77-91
New zinc(II) 4-hydroxybenzoate complex compounds with general formula [Zn(4-OHbenz)2Ln]·xH2O, where 4-OHbenz = 4-hydroxybenzoate; L = isonicotinamide, N-methylnicotinamide, N,N-diethylnicotinamide, thiourea, urea, phenazone, theophylline, methyl-3-pyridylcarbamate; n = 2, 3; x = 0–3, 5, were synthesized and characterised by elemental analysis, thermal analysis and IR spectroscopy. The thermal behaviour of the prepared compounds was studied by TG/DTG and DTA methods in argon atmosphere. The thermal decomposition of hydrated compounds started with dehydration. During the thermal decomposition, organic ligand, carbon monoxide, carbon dioxide and phenol were evolved. The final solid product of the thermal decomposition was zinc or zinc oxide. The volatile gaseous product, solid intermediate products and the final product of thermal decomposition were identified by IR spectroscopy, mass spectrometry, qualitative chemical analyses and X-ray powder diffraction method. The antimicrobial activity of zinc(II) carboxylate compounds was tested against various strains of bacteria, yeasts and filamentous fungi (S. aureus, E. coli, C. parapsilosis, R. oryzae, A. alternata, M. gypseum). The presence of zinc in complexes led to the increase in their antimicrobial activity in comparison with free 4-hydroxybenzoic acid. 相似文献
3.
Andogová E. Györyová K. Nour El-Dien F. A. 《Journal of Thermal Analysis and Calorimetry》2002,69(1):245-253
Four new complex compounds were prepared by the reaction of zinc bromobutyrate and organic ligands. The general formula of the synthetized complex compounds are (2-Brbut)2ZnL and (4-Brbut)2ZnL2nH2O (but=butyrate, L=theobromine (tbr), theophylline (tph), methyl-3-pyridyl carbamate (mpc), n=0-1). The compounds were characterized by chemical analysis and IR spectroscopy. The thermal behaviour of the zinc(II) complexes was studied by thermal analysis. Thermal decomposition in the case of hydrated compounds starts with the release of water molecules. Then molecules of organic ligands and the bromobutyrate anion are released and decomposed. CH3CH2CH=O, CO, CH2=CHCH=O, CH2O and ZnBr2 were found as gaseous products of thermal decomposition during heating up to 700°C. IR, mass spectroscopy, X-ray powder diffraction and chemical analysis were used for the determination of solid and gaseous intermediates and products of the thermal decomposition.This revised version was published online in November 2005 with corrections to the Cover Date. 相似文献
4.
Lenka Findoráková Katarína Győryová Daniela Hudecová Dagmar Mudroňová Jana Kovářová Katarína Homzová Faten A. Nour El-Dien 《Journal of Thermal Analysis and Calorimetry》2013,111(3):1771-1781
New zinc(II) 2-chlorobenzoates of general formula [Zn(2-ClC6H4COO)2(L)2] (where L = caffeine—caf, urea—u, methyl-3-pyridylcarbamate—mpc, phenazone—phen, theophylline—thp) were synthesised and characterised by elemental analysis and IR spectroscopy. The thermal behaviour of the complexes was studied by TG/DTG and DTA methods in nitrogen and in air atmosphere. During the thermal decomposition of the studied compounds the release of organic ligands take place followed by the decomposition of 2-chlorobenzoate anion. The volatile decomposition intermediates were proved by mass spectrometry. Zinc oxide was found as the final product of the thermal decomposition performed up to 1,000 K. The antimicrobial activity of the zinc(II) complexes against various strains of bacteria, yeasts and filamentous fungi has been investigated. It was found that the prepared compounds decreased the growth of Staphylococcus aureus, Escherichia coli, Candida albicans, Rhizopus oryzae and Microsporum gypseum, respectively. The most resistant to all tested compounds was probiotic strain of Lactobacillus plantarum. The presence of zinc and ligands in the prepared compounds increased the inhibitory effect compared to sodium salt of prepared compounds and free ligands. 相似文献
5.
K. Györyová J. Kovářová M. Melník E. Andogová 《Journal of Thermal Analysis and Calorimetry》1999,56(2):503-511
New zinc bromobutyrate complexes of general formula ZnX2·1−L·nH2O (X=CH2Br(CH2)2COO−; CH3CH2CHBrCOO−) containing one or two molecules of caffeine, nicotin-amide and phenazone as ligands (L) were prepared.
The compounds were characterized by MS-, IR- spectroscopy, chemical and thermal analysis. The thermal decomposition of hydrated
compounds starts by the release of water molecules. In anhydrous compounds the loss of organic ligands takes place followed
by the decomposition of the bromobutyrate anion at higher temperatures. Zinc bromide was found among the final products of
thermal decomposition. Water, carbon monoxide, propylaldehyde, vinylaldehyde and formaldehyde were detected in the gaseous
products of the thermally decomposed samples on heating up to 700°C.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
6.
B. T. Usubaliev A. L. Shabanov A. Sh. Tomueva M. K. Munshieva P. S. Safarova F. B. Alieva Z. A. Mamedova 《Russian Journal of General Chemistry》2014,84(7):1378-1384
Nanostructured non-valence compounds based on coordination compounds of zinc(II) with phthalic and terephthalic acids have been prepared. The purity and composition of prepared compounds have been elucidated from X-ray diffraction analysis, IR spectroscopy, elemental analysis, and thermogravimetry studies; thermal decomposition of the non-valence compounds has been studied as well. The prepared self-assembled compounds are co-precipitated with one water molecule and 1.5 acetic acid molecules per unit of the dicarboxylic acid: [Zn4(OH)6·o-C6H4(COO)2]·H2O·1.5CH3COOH and [Zn4(OH)6·p-C6H4(COO)2]·H2O· 1.5CH3COOH. 相似文献
7.
K. Györyová V. Balek B. H. Behrens A. Matuschek A. Kettrup 《Journal of Thermal Analysis and Calorimetry》1997,48(6):1263-1271
The new zinc(II) complexes of general formula Zn(CH3CH2CH2COO)2· nL (whereL = caffeine, nicotinamide, theobromine;n=1 or 2) were prepared and identified.Thermal properties of these compounds were investigated by thermal analysis (TG/DTG, DTA, DSC/DDSC).Gaseous products of thermal decomposition were detected by IR spectroscopy and Mass spectroscopy. Final products of thermal decomposition were determined by X-ray powder diffraction patterns.This work was supported by the Slovak Ministry of Education Grant No. 1/3230/96. This financial support is gratefully acknowledged. 相似文献
8.
Annamária Krajníková Katarína Gy?ryová Jana Ková?ová Daniela Hudecová Jana Hubá?ková Faten Nour El-Dien Marián Koman 《Journal of Thermal Analysis and Calorimetry》2012,110(1):177-185
New zinc(II) 4-bromobenzoate complex compounds with general formula [Zn(4-BrC6H4COO)2L2]·xH2O (where L?=?urea, nicotinamide, phenazone or thiourea, x?=?0?C2) were prepared and characterized by elemental analysis, IR spectroscopy and thermal analysis. The thermal decomposition of hydrated compounds started with dehydration process. During the thermal decomposition, the neutral organic ligand, bis(4-bromophenyl)methanone and carbon dioxide were evolved. The solid intermediates and volatile products of thermal decomposition were proved by IR spectroscopy and mass spectrometry. The final solid product of the thermal decomposition heated up to 800?°C was zinc oxide, which was confirmed by X-ray powder diffractometry. Antimicrobial activity of the prepared compounds was tested against various strains of bacteria, yeasts and filamentous fungi (E. coli, S. aureus, C. albicans, R. oryzae, A. alternata and M. gypseum). It was found that bacterium S. aureus and fungi A. alternata are the most sensitive to the studied compounds. 相似文献
9.
Erika Szunyogová Dagmar Mudroňová Katarína Györyová Radomíra Nemcová Jana Kovářová Lenka Piknová-Findoráková 《Journal of Thermal Analysis and Calorimetry》2007,88(2):355-361
Spectroscopic (IR), thermoanalytical (TG/DTG, DTA) and biological methods
were applied to investigate physicochemical and biological properties of seven
zinc(II) complex compounds of the following formula Zn(HCOO)2·2H2O
(I), Zn(HCOO)2·tph (II), Zn(CH3COO)2·2H2O (III), Zn(CH3COO)2·tph
(IV), Zn(CH3COO)2·2phen
(V), Zn(CH3CH2COO)2·2H2O
(VI), Zn(CH3CH2CH2COO)2·2H2O (VII), where tph=theophylline, phen=phenazone. The formation of various
intermediates during thermal decomposition suggests the dependence on the
length of aliphatic carboxylic chain and type of N-donor ligand (tph, phen).
The final product of the thermal decomposition was ZnO. The antimicrobial
activity of these complexes were tested against G+
and G– bacteria. Strong inhibitive effect
was observed towards E. coli, salmonellae
and Staph. aureus. 相似文献
10.
Bernardi M. Inês B. Araújo Vinícius D. Mesquita Alexandre Frigo Geraldo J. M. Maia Lauro J. Q. 《Journal of Thermal Analysis and Calorimetry》2009,95(3):923-928
Novel zinc(II) complex compounds of general formula Zn(C6H5COO)2·L2 (where L=caffeine (caf) and urea (u)) were synthesized and characterized by elemental analysis and IR spectroscopy. The thermal behaviour
of the complexes was studied during heating in air by thermogravimetry. It was found that the thermal decomposition of the
anhydrous Zn(II) benzoate compounds with bioactive ligands was initiated by the release of organic ligands at various temperatures.
On further heating of the compounds up to 400°C the thermal degradation of the benzoate anions took place. Zinc oxide was
found as the final product of the thermal decomposition of all zinc(II) benzoate complex compounds heated to 600°C. Results
of elemental analysis, infrared spectroscopy, mass spectroscopy and thermogravimetry are presented. 相似文献
11.
Thermal decompositions of zinc(II) chloroacetate and its complexes with nicotinamide and caffeine were studied by means of TG/DTG, DTA, IR and mass spectroscopy. Thermal analysis showed that presence of the halogen significantly influenced the thermal decomposition. Decompositions may be characterized as two step reactions (release of nicotinamide or caffeine followed by pyrolysis of the carboxylate anion). Zinc chloride, CO, CO2, CH2O, ClCH2CHO were found in gaseous products of the thermal decomposition. 相似文献
12.
Szunyogová E. Györyová K. Kováşová J. Juhászová E. 《Journal of Thermal Analysis and Calorimetry》2003,71(3):967-976
Four new complex compounds were prepared by reaction of zinc carboxylate and methyl-3-pyridyl carbamate. The synthesized complex
compounds of the general formula (RCOO)2ZnL2 (RCOO-= HCOO- (form), CH3COO- (ac), CH3CH2CH2COO- (but), (CH3)2CHCOO- (isobut), L= methyl-3-pyridyl carbamate (mpc)) were characterized by chemical analysis, IR spectroscopy and studied by methods of thermal
analysis (TG/DTG, DTA). CH2O, CO2, (CH3)2CO, (C3H7)2CO were found as volatile products of thermal decomposition. ZnO was found as final product of thermal decomposition of the
prepared complexes heated up to 700°C. Mass spectroscopy, X-ray powder diffraction method, IR spectra and chemical analysis
were used for the determination of the thermal decomposition products.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
13.
Annamária Krajníková Katarína Győryová Daniela Hudecová Jana Kovářová Zuzana Vargová 《Journal of Thermal Analysis and Calorimetry》2011,105(2):451-460
New zinc(II) 2-bromobenzoate complex compounds with general formula Zn(2-BrC6H4COO)2·nL·xH2O (where L = urea, nicotinamide, N-methylnicotinamide, N,N-diethylnicotinamide, isonicotinamide, phenazone n = 0–2, x = 0–2) were prepared and characterized by elemental analysis, IR spectroscopy and thermal analysis. The thermal decomposition
of hydrated compounds started with dehydration process. During the thermal decomposition organic ligand, carbon dioxide and
bis(2-bromophenyl)ketone were evolved. The solid intermediates and volatile products of thermal decomposition were proved
by IR spectroscopy and mass spectrometry. The final solid product of the thermal decomposition heated up to 1073 K was zinc
oxide. Antimicrobial activity of the prepared compounds was tested against various strains of bacteria, yeasts and filamentous
fungi (E. coli, S. aureus, C. albicans, R. oryzae, A. alternate and M. gypseum). It was found that the selected bacteria were more sensitive to the studied zinc(II) complex compounds than the yeast and
the filamentous fungi. 相似文献
14.
Zuzana Bujdo?ová Katarína Gy?ryová Dagmar Mudroňová Daniela Hudecová Jana Ková?ová 《Journal of Thermal Analysis and Calorimetry》2012,110(1):167-176
New zinc(II) 4- and 5-chlorosalicylate complexes of general formula [Zn(X-sal)2(L) n (H2O) x ] (where X-sal?=?4-Clsalicylate, 5-Clsalicylate; L?=?N,N-diethylnicotinamide, isonicotinamide, theophylline; n?=?1, 2; x?=?0, 1, 2, 4) were prepared. The complexes were determined by elemental analysis and characterised by infrared spectroscopy. The thermal behaviour of the complexes was studied by simultaneous TG, DTG and DTA methods under dynamic air conditions. The thermal decomposition is a multi-step process. In the first step of the thermal decomposition, water is released in hydrated compounds. The anhydrous compounds start to decompose by the release of organic ligand, followed by chlorosalicylic acid, chlorophenol and carbon monoxide. The final solid product of the thermal decomposition is zinc oxide. The volatile products of the thermal decomposition were determined by mass spectrometry. The antimicrobial activities of the complexes were evaluated against selected pathogen and probiotic bacteria, yeasts and fungi strains. Bioactivities of the tested compounds are different against bacteria, yeasts and filamentous fungi. It was found that bacteria were more sensitive to the studied zinc(II) complex compounds than yeasts or filamentous fungi. 相似文献
15.
New mixed-ligand tetraethylammonium halogenocobaltates(II) of general formula [Et4N]2[CoBrnCl4−n] have been synthesized. Their thermal properties were characterized on the basis of the TG and DTG curves taken in argon and derivatograms recorded in static air. Some products of successive decomposition steps were identified based on their IR, FIR and VIS spectra as well as the results of elemental analysis. The influence of the nature of the complex anion and oven atmosphere on the progress of thermal decomposition of the compounds has been discussed. 相似文献
16.
Zuzana Bujdošová Katarína Györyová Daniela Hudecová Jana Kovářová Ladislav Halás 《Chemical Papers》2010,64(5):584-591
New zinc(II) 4-chloro- and 5-chlorosalicylate complex compounds of the general formula ((4- or 5-Cl)C6H3(2-OH)COO)2Zn · L
n
(where L = methyl 3-pyridylcarbamate, phenazone; n = 2, 4) were prepared and characterized by elemental analysis, thermal analysis (TG/DTG, DTA), and IR spectroscopy. During
thermal decomposition, mpc, phen, chlorosalicylic acid, chlorophenol, carbon dioxide, and carbon monoxide were released. Volatile
products of the thermal decomposition were confirmed by mass spectrometry. The final solid product of the thermal decomposition
up to 700°C was zinc oxide or metallic zinc. Antimicrobial activity of the compounds prepared was tested against various strains
of bacteria, yeasts and filamentous fungi. The highest antimicrobial effect was determined against the G+ bacteria S. aureus. 相似文献
17.
The stoichiometry of thermal decomposition was studied for the following Mg(II) nicotinamide (NA) complexes: Mg(Ac)2(NA)5·2H2O (I), Mg(CIAc)2(NA)6·6H2O (II), Mg(Cl2Ac)2(NA)6·5H2O (III) and Mg(Cl3Ac)2(NA)6·2H2O (IV), where Ac=CH3COO−, ClAc=ClCH2COO−, Cl2Ac=Cl2CHCOO− and Cl3Ac=Cl3CCOO−. Heating the compounds results first in the release of water molecules. The NA molecules are released in one step (complexes
II and III) or in two steps (complexes I and IV). The compositions of the complexes, the solid-state intermediates and the
products of thermolysis were identified by means of elemental analysis and complexometric titration. The results reveal that
MgO is left as residue at the end of thermal degradation of compounds I–IV, NA is coordinated to Mg(II) through the nitrogen
atom of the heterocyclic ring. The IR data indicate unidentate coordination of the carboxylate ions to the Mg(II) in complexes
I–IV.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
18.
Györyová K. Kovářová J. Andogová E. Zeleňák V. Nour El-Dien F. A. 《Journal of Thermal Analysis and Calorimetry》2002,67(1):119-128
Zinc carboxylate complexes with N-donor ligands exhibit antimicrobial and antifungal effects. The preparation and thermal properties of complex compounds Zn(isobut)2 and Zn(isobut)2L(isobut=(CH3)2CHCOO–, L=papaverine — pap, phenazone — phen) are described in this paper. The newly synthesized compounds were characterized by elemental analysis, IR spectroscopy and TG/DTG, DTA methods.During the thermal treatment it was found that the release of organicligands (pap, phen) was followed by pyrolysis of zinc(II) isobutyrate. (C3H7)2CO and CO2 were found as gaseous products and zinc oxide as the final product of thermal decomposition. Gaseous and solid products of thermal decomposition were confirmed by chemical analysis, IR spectra and X-ray powder diffraction.This revised version was published online in November 2005 with corrections to the Cover Date. 相似文献
19.
New solid complexes of a herbicide known as dicamba (3,6-dichloro-2-methoxybenzoic acid) with Pb(II), Cd(II), Cu(II) and Hg(II)
of the general formula M(dicamba)2·xH2O (M=metal, x=0-2) and Zn2(OH)(dicamba)3·2H2O have been prepared and studied. The complexes have different crystal structures. The carboxylate groups in the lead, cadmium
and copper complexes are bidentate, chelating, symmetrical, in Hg(dicamba)2·2H2O - unidentate, and in the zinc salt - bidentate, bridging, symmetrical. The anhydrous compounds decompose in three stages,
except for the lead salt whose decomposition proceeds in four stages. The main gaseous decomposition products are CO2, CH3OH, HCl and H2O. Trace amounts of compounds containing an aromatic ring were also detected. The final solid decomposition products are oxychlorides
of metals and CuO.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
20.
Summary The new mixed-ligand complexes of d-electron metals (M(II)=Mn, Ni, Cu) with 2,2'-bipyridine (2-bpy) and mono- or dichloroacetates were prepared as crystalline solids. The general
formulae of the synthetized complexes are: Cu(2-bpy)2(CClH2COO)2·2H2O, Mn(2-bpy)2(CCl2HCOO)2, M(2-bpy)2(CCl2HCOO)2·2H2O (M(II)=Ni, Cu). The compounds were characterized by chemical analysis, IR and VIS spectroscopy. Their magnetic, molar conductivity
and thermal properties also were studied. During heating in air complexes decompose via different intermediate products to
metal oxides. A coupled TG-MS system was used to analyse the principal volatile thermal decomposition (or fragmentation) products
of 2,2'-bipyridine-chloroacetato complexes. 相似文献