2-羰基丙酸(4-吡啶甲酰基)腙与碱土金属配合物的晶体结构及热稳定性

The Crystal Structures and Thermal Stability of the Complexes of 2 - Oxo - propionic acid (4 - pyridinecarbonyl) hydrazone with Alkaline Earth Metals

报道了2-羰基丙酸(4-吡啶甲酰基)腙(H_2L)与碱土金属(Ca,Mg,Sr,Ba)四种配合物的合成,结构及热稳定性.同时,用X射线单晶衍射仪测定了Mg和Ba两种配合物的晶体结构,结构分析表明两种配合物均属单斜晶系,空间群均为P2_1/c.此外,还比较讨论了各配合物不同成键方式所对应的IR特征及热稳定性变化规律.

The Syntheses, structures and properties of the complexes of 2-oxo-propionic acid (4 - pyridinecarbonyl) - hydrazone with alkaline earth metals are reported in the paper. The crystal structures of Mg and Ba complex were determined by x-ray single crystal diffraction analysis, The results show that two complexes are monoclinic of space group P21/c; the cell parameters are as follows: MgL·4H2O,a = 1. 053, b = 1.1308, c = 1.1948nm,β=103.24°,Z = 4, Vc = 1.3859nm3,Dc=1.45g/cm3,.R=0.00379.Ba(HL)2·9H2O,a = 1.4082,b =0.7263, c= 2. 7798nm, β=93. 14°, Z = 4, Vc = 2. 8389nm3, Dc = 1. 67g/cm3, R = 0. 0404. Besides, typical IR bands of the bonding in various forms and thermal stability are discussed in comparison with each other.