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Thermodynamic properties and molecular dynamics of (NH4)2Zn(SO4)2·6H2O studied by single-crystal NMR and MAS NMR

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Abstract

The thermodynamic properties and molecular dynamics of (NH4)2Zn(SO4)2·6H2O were investigated using thermogravimetric analysis, differential scanning calorimetry, and nuclear magnetic resonance observations. The first mass loss occurs near 350 K (= T d) and is interpreted as the onset of partial thermal decomposition. The temperature dependences of the spin–lattice relaxation time in laboratory frame T 1 and in rotating frame T 1ρ for H nuclei were studied near T d and T C1. The increase in T 1 near T d seems to be related to the ammonium protons, and the abrupt decrease in T 1ρ near T d can be explained due to the loss of H2O.

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Acknowledgments

This research was supported by the Basic Science Research program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2012001763).

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  1. Department of Science Education, Jeonju University, Jeonju, 560-759, Korea

    Ae Ran Lim

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Lim, A.R. Thermodynamic properties and molecular dynamics of (NH4)2Zn(SO4)2·6H2O studied by single-crystal NMR and MAS NMR. J Therm Anal Calorim 114, 699–703 (2013). https://doi.org/10.1007/s10973-013-3068-5

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  • DOI: https://doi.org/10.1007/s10973-013-3068-5

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