Behavior of H2O surrounding NH4+ and Al-3(+) in NH4Al(SO4)(2)center dot 12H(2)O by H-1 MAS NMR, N-14 NMR, and Al-27 NMR

Lim Ae Ran

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Behavior of H2O surrounding NH4+ and Al-3(+) in NH4Al(SO4)(2)center dot 12H(2)O by H-1 MAS NMR, N-14 NMR, and Al-27 NMR

机译：NH4AL（SO4）（2）中心点12H（2）o在H-1MAS NMR，N-14 NMR和Al-27 NMR中的H2O围绕NH4 +和Al-3（+）的行为

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In order to understand the thermodynamic properties and structural geometry of NH4Al(SO4)(2)center dot 12H(2)O, we studied the magic angle spinning nuclear magnetic resonance (MAS NMR) and static NMR as a function of temperature. The changes of the chemical shifts, linewidths, resonance frequencies, and spin-lattice relaxation times for H-1, N-14, and Al-27 nuclei near T-d (= 335 K), which is interpreted as the onset of partial thermal decomposition, are due to the structural phase transition. The changes near T-d are related to the loss of H2O, which probably disrupts the forms of the octahedra of water molecules surrounding NH4+ and Al3+ ions. This mechanism above T-d is related to hydrogen-bond transfer involving the breakage of the weak part of the hydrogen bond.

机译：为了了解NH4AL（SO4）（2）中心点12H（2）O的热力学性能和结构几何形状，我们研究了魔法角旋转核磁共振（MAS NMR）和静态NMR作为温度的函数。用于H-1，N-14和Al-27核附近的化学换档，线宽，共振频率和旋转晶格弛豫时间的变化，附近Td（= 335 k），这被解释为部分热分解的发作，是由于结构相转变。 T-D附近的变化与H2O的损失有关，这可能破坏NH4 +和Al3 +离子周围的水分子的八面体的形式。该机制高于T-D与涉及氢键的弱部分破裂的氢键转移有关。

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《RSC Advances》 |2017年第87期|共6页
作者
Lim Ae Ran;
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Jeonju Univ Analyt Lab Adv Ferroelect Crystals Jeonju 55069 South Korea;

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正文语种 eng
中图分类化学;
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1. Behavior of H2O surrounding NH4+ and Al-3(+) in NH4Al(SO4)(2)center dot 12H(2)O by H-1 MAS NMR, N-14 NMR, and Al-27 NMR [J] . Lim Ae Ran RSC Advances . 2017,第87期

机译：NH4AL（SO4）（2）中心点12H（2）o在H-1MAS NMR，N-14 NMR和Al-27 NMR中的H2O围绕NH4 +和Al-3（+）的行为
2. H-1 and Al-27 NMR study of the ferroelectric transition in dimethylammonium aluminum sulphate hexahydrate (CH3)(2)NH2Al(SO4)(2)center dot 6H2O [J] . Dolinsek J., Arcon D., Kim HJ., Physical Review, B. Condensed Matter . 1999,第5期

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Behavior of H2O surrounding NH4+ and Al-3(+) in NH4Al(SO4)(2)center dot 12H(2)O by H-1 MAS NMR, N-14 NMR, and Al-27 NMR

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