Samples of antimony(III) phosphate, a layered material, were prepared at room temperature, using the two allotropic forms of Sb2O3, layered valentinite and cubic senarmontite. The compounds were characterized by infrared spectroscopy, X-ray diffraction, and thermogravimetric–differential thermal analysis. Solids exposed to ammonia, ethylenediamine, or hydrazine vapors also were studied. The interaction
NMR study of molecular dynamics in hydrazinium phosphates
作者:K. Ganesan、R. Damle、J. Ramakrishna
DOI:10.1016/0022-3697(90)90110-2
日期:1990.1
Abstract The proton spin-lattice relaxation time T 1 (at 5.4, 10 and 15 MHz) and second moment M 2 (at 9.8 MHz) were measured in the temperature range 77–300 K in hydrazinium dihydrogen phosphate N 2 H 5 H 2 PO 4 and dihydrazinium hydrogen phosphate (N 2 H 5 ) 2 HPO 4 . In N 2 H 5 H 2 PO 4 a well-defined single proton T 1 , minimum and three M 2 transitions have been observed. The T 1 minimum has been interpreted
摘要 质子自旋晶格弛豫时间 T 1 (在 5.4、10 和 15 MHz 下)和二阶矩 M 2 (在 9.8 MHz 下)在 77–300 K 的温度范围内在磷酸二氢肼 N 2 H 5 H 2 PO 中测量4 和磷酸氢二肼 (N 2 H 5 ) 2 HPO 4 。在 N 2 H 5 H 2 PO 4 中,已观察到明确定义的单质子 T 1 、最小和三个 M 2 跃迁。T 1 最小值已被解释为活化能为7.69 kcal mol -1 的NH 3 基团重新定向,通过自旋扩散松弛所有质子。在 (N 2 H 5 ) 2 HPO 4 中,已在 T 1 的温度依赖性中观察到单个 T 1 最小值和小的滞后行为。观察到两个M 2 跃迁。T 1 最小值已被解释为活化能为4.4 kcal mol -1 的NH 3 基团重新定向。