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Preparation and Thermal Chemical Properties of Compounds of Zinc Nitrate with Valine
Gao, S., Chen, S., Yang, X. and Shi, Q. Preparation and Thermal Chemical Properties of Compounds of Zinc Nitrate with Valine Chemical Papers, Vol.58, No. 2, 2004, 87-92
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Document type:
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Článok z časopisu / Journal Article |
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Collection:
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Chemical papers
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| Attached Files |
| Name |
Description |
MIMEType |
Size |
Downloads |
n582a87.pdf
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582a87.pdf |
application/pdf |
201.71KB |
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| Author(s) |
Gao, S.
Chen, S.
Yang, X.
Shi, Q.
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| Title |
Preparation and Thermal Chemical Properties of Compounds of Zinc Nitrate with Valine
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| Journal name |
Chemical Papers
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| Publication date |
2004
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| Year available |
2004
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| Volume number |
58
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| Issue number |
2
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| ISSN |
0366-6352
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| Start page |
87
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| End page |
92
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| Place of publication |
Poland
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| Publisher |
Versita
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| Collection year |
2004
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| Language |
english
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| Subject |
250000 Chemical Sciences
250200 Inorganic Chemistry
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| Abstract/Summary |
The solubility property of the Zn(NO3)2—Val—H2O system at 25°C in the whole composition range has been investigated by the semimicrophase equilibrium method. The corresponding phase diagrams and refractive index diagrams were constructed. From the phase equilibrium results, the incongruently soluble compounds Zn(Val)(NO3)2 ·2H2O, Zn(Val)2(NO3)2 ·H2O, and Zn(Val)3(NO3)2·H2O were synthesized and characterized by IR, XRD, TG—DTG, as well as chemical and elemental analyses. The constant-volume combustion energies of the compounds, ΔcE, determined by a precision rotating bomb calorimeter at 298.15 K, were (−10064.24 ± 5.41) J g−1, (−13523.98 ± 7.54) J g−1, and (−16116.13 ± 7.58) J g−1, respectively. The standard enthalpies of combustion for these compounds, ΔcH, were calculated to be (−3442.21 ± 2.25) kJ mol −1, (−5971.2 ± 3.32) kJ mol−1, and (−9007.26 ± 4.24) kJ mol−1 while the standard enthalpies of formation were (−1017.34± 2.00) kJ mol−1, (−1742.93 ± 3.61) kJ mol−1, and (−2245.70 ± 4.73) kJ mol−1. The enthalpies of solution in condition of simulating human gastric juice (37°C, pH = 1, the solution of hydrochloric acid), which were also measured by a microcalorimeter, were (22.17 ± 0.05) kJ mol−1, (14.89 ± 0.04) kJ mol−1, and (6.85 ± 0.07) kJ mol−1, respectively.
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