Effect of Deuteration on Order-Disorder in Hydrogen Disulfate Compounds, M₃H(SO₄)₂ (M = Na, K, Rb, Cs, NH₄)

I. Petrov Institute of Chemistry, Faculty of Science, Cyril and Methodi University, Skopje, Yugoslavia

V. Petrushevski Institute of Chemistry, Faculty of Science, Cyril and Methodi University, Skopje, Yugoslavia

A. W. Al-kassab Dept. of Chemistry, La Trobe University, Bundoora Vic, 3083, Australia

J. Liesegang Dept. of Chemistry, La Trobe University, Bundoora Vic, 3083, Australia; Dept. of Physics

B. D. James Dept. of Chemistry, La Trobe University, Bundoora Vic, 3083, Australia

Abstract

All the hydrogen disulfates M₃H(S0₄)₂ (M = Na, K, Rb, Cs and NH₄) display broad infrared spectra characteristic of very strong 0-H….0 hydrogen bonds overlapped by SO₄ group vibrations. Raman spectra (for compounds with M = Na, K, Rb) display the characteristic SO₄ modes more clearly. An ordered solid state at room temperature is suggested for M = Na and partially for K, while disorder is present when M = NH₄ Cs and Rb. Deuteration brings about ordering for M = K, NH₄ and in part when M = Rb, Cs. Order is also facilitated by lowering the temperature.

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Effect of Deuteration on Order-Disorder in Hydrogen Disulfate Compounds, M₃H(SO₄)₂ (M = Na, K, Rb, Cs, NH₄)

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Effect of Deuteration on Order-Disorder in Hydrogen Disulfate Compounds, M₃H(SO₄)₂ (M = Na, K, Rb, Cs, NH₄)