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G. A. Sharpataya K. S. Gavrichev A. V. Khoroshilov V. N. Plakhotnik V. M. Gurevich 《Journal of Thermal Analysis and Calorimetry》2005,81(2):339-346
Summary Cobalt(II), nickel(II) and copper(II) complexes of some aroylhydrazone Schiff’s bases derived from isoniazide (hydrazide of isonicotinic acid) with p-hydroxybenzaldehyde; 2,4-dihydroxybenzaldehyde or 2-hydroxy-1-naphthaldehyde are prepared and characterized. The study reveals that the ligands coordinate in the keto form. That transformed to the enol through the loss of HCl upon heating the solid complexes. The copper(II) complexes are thermochromic in the solid-state while the cobalt(II) complex, 3 of 2,4-dihydroxybenzaldehyde moiety is solvatochromic in hot DMF. The chromisms obtained were discussed in terms of change in the ligand field strength and/or coordination geometry. 相似文献
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A. V. Khoroshilov G. A. Sharpataya K. S. Gavrichev M. A. Ryumin 《Russian Journal of Inorganic Chemistry》2012,57(8):1123-1127
Differential scanning calorimetry (DSC) was used to study the thermal behavior of sodium molybdate in the range of elevated temperatures. Parameters (temperatures and enthalpies) of phase transformations in Na2MoO4 were determined. 相似文献
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G. A. Sharpataya I. D. Sokolova Z. P. Ozerova 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1-4)
Abstract The heat capacity of Mg, Ca, Sr, Ba, Zn, Co, Ni and Cu diphospnates was studied with a differential scanning calorimeter DSC 111 “SETARAM”. Step heating program was used. 相似文献
4.
V. B. Lazarev J. H. Greenberg Z. P. Ozerova G. A. Sharpataya 《Journal of Thermal Analysis and Calorimetry》1988,33(3):797-799
DSC and vapour pressure measurements are presented on some Be, Al and Cr complexes with 2,4-pentanedione tetramethyl-3,5-heptanedione, 1,1,1-trifluoro-2,4-pentanedione and hexafluoro-2,4-pentanedione. Thermodynamic functions are given for the sublimation, vaporization and melting processes of the substances.
Zusammenfassung Die Ergebnisse von DSC- und Dampfdruckmessungen einiger Komplexe von Beryllium, Aluminium und Chrom mit 2,4-Pentandion (HAA), Tetramethyl-3,5-heptandion (HTHD), 1,1,1-Trifluoro-2,4-pentandion (HATA) und Hexafluoro-2,4-pentandion (HHFA) werden beschrieben. Die berechneten thermodynamischen Funktionen für Sublimation, Verdampfung und Schmelzen der Komplexverbindungen sind tabelliert.
, 2,4- , 1,1,1-- -2,4- -3,5- . , .相似文献
5.
K. S. Gavrichev M. A. Ryumin A. V. Tyurin V. M. Gurevich L. N. Komissarova A. V. Khoroshilov G. A. Sharpataya 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2009,83(3):327-333
The low-temperature heat capacity of K2MoO4 was measured by adiabatic calorimetry. The smoothed heat capacity values, entropies, reduced Gibbs energies, and enthalpies were calculated over the temperature range 0–330 K. The standard thermodynamic functions determined at 298.15 K were C p ° (298.15 K) = 143.1 ± 0.2 J/(mol K), S°(298.15 K) = 199.3 ± 0.4 J/(mol K), H°(298.15 K)-H°(0) = 28.41 ± 0.03 kJ/mol, and Φ°(298.15 K) = 104.0 ± 0.4 J/(mol K). The thermal behavior of potassium molybdate at elevated temperatures was studied by differential scanning calorimetry. The parameters of polymorphic transitions and fusion of potassium molybdate were determined. 相似文献
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Gavritchev K. S. Sharpataya G. A. Smagin A. A. Malyi E. N. Matyukha V. A. 《Journal of Thermal Analysis and Calorimetry》2003,73(1):71-83
Enthalpy of formation of lithium hexafluorophosphate was calculated based on the differential scanning calorimetry study of
heat capacity and thermal decomposition. It was found that thermal decomposition of LiPF6 proceeds at normal pressure in the temperature range 450-550 K. Enthalpy of LiPF6 decomposition is Δd
H(LiPF6, c, 298.15 K)= 84.27±1.34 kJ mole-1. Enthalpy of formation of lithium hexafluorophosphate from elements in standard state is Δf
H
0(LiPF6,c, 298.15 K) = -2296±3 kJ mol-1.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
7.
K. S. Gavrichev N. N. Smirnova A. V. Khoroshilov M. A. Ryumin V. M. Gurevich A. V. Tyurin G. A. Sharpataya L. N. Komissarova V. P. Danilov 《Russian Journal of Inorganic Chemistry》2007,52(5):727-732
The low-temperature heat capacity of Na2Lu (MoO4)(PO4) was measured by adiabatic calorimetry in the range of 7.47–345.74 K. The experimental data were used to calculate the thermodynamic functions of Na2Lu (MoO4)(PO4). At 298.15 K, the following values were obtained: C p 0 (298.15 K) = 237.7 ± 0.1 J/(K mol), S 0(298.15 K) = 278.1 ± 0.8 J/(K mol), H 0(298.15 K) ? H 0 (0 K) = 42330 ± 20 J/mol, and Φ0(298.15 K) = 136.1 ± 0. 3 J/(K mol). A heat capacity anomaly was found in the range of 10-67 K with a maximum at T tr = 39.18 K. The entropy and enthalpy of transition are ΔS = 12.39 ± 0.75 J/(K mol) and ΔH = 403 ± 16 J/mol. The thermal investigation of sodium lutetium molybdate phosphate in the high-temperature range (623–1223 K) was performed using differential scanning calorimetry. It was found that during melting in the range of 1030–1200 K, Na2Lu(MoO4)(PO4) degrades to simpler compounds; the degradation scenario is verified by X-ray powder diffraction. 相似文献
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