Synthesis and spectroscopic identification of nickel and cobalt layered hydroxides and hydroxynitrates
作者:Samuel P. Wallbridge、Kurt Lawson、Amy E. Catling、Caroline A. Kirk、Sandra E. Dann
DOI:10.1039/d2dt03166c
日期:——
As well as the brucite type β-M(OH)2 and the hydrotalcite-like [M(OH)2−x(H2O)x]x+ alpha-phases (where M = Ni, Co), two different hydroxynitrate phases were isolated with the generic formula M(OH)2−x(NO3)x with x = 0.67 and 1.0 (where M = Ni, Co). The reduction of symmetry of the nitrate anion from D3h to C2v allows the alpha-phases to be distinguished from the two different layered hydroxynitrate phases
已经研究了通过各种溶液和固态合成方法形成不同的镍和钴层状氢氧化物相。最初,改进了制备方法以从金属 ( II ) 硝酸盐六水合物起始材料生成单相产物,然后通过粉末 X 射线衍射、振动光谱和热重分析对其进行表征。以及水镁石型 β-M(OH) 2和类水滑石 [M(OH) 2− x (H 2 O) x ] x + α-相(其中 M = Ni, Co),两种不同的羟基硝酸盐用通式 M(OH) 2− x (NO 3) x其中x = 0.67 和 1.0(其中 M = Ni、Co)。硝酸根阴离子的对称性从D 3h减少到C 2v允许通过红外和拉曼光谱通过失去对称性和伴随的简并带分裂将 α 相与两个不同的层状羟基硝酸盐相区分开来。对称的 N-O 拉伸使两个羟基硝酸盐相能够通过ca 处的尖锐吸收带相互区分。1000 cm -1 ( x = 0.67) 和ca。1050 厘米−1 ( x= 1.0)。这些相的热