摘要
以L 苏糖酸钙与草酸的复分解反应得到的L 苏糖酸溶液 ,在 80℃下与过量CoO反应较长时间 ,滤液浓缩后加无水乙醇制得L 苏糖酸钴粉红色粉末 .用化学分析及元素分析确定其组成为Co(C4 H7O5)·H2 O ,IR光谱分析结果表明新化合物中苏糖酸以羧基氧原子与Co2 + 配位 .TD DTG结果说明 ,它在热分解中有一定稳定性 ,经脱水生成Co (C4 H7O5) 2 ,最后生成CoO .用转动弹热量计测得其恒容燃烧能ΔcE为 (- 35 0 4 4 7± 1 6 4)kJ·mol-1,计算得其标准燃烧焓和标准生成焓ΔfHθm 分别为 (- 35 0 1 99± 1 6 4)和 (- 2 170 6 7± 1 97)kJ·mol-1.
Cobalt L-threonate was obtained as pink powder from the reaction of L-threonic acid solution (prepared by double decomposition reaction of calcium L-threonate with oxalic acid) with superfluous cobalt oxide at 80 T. The composition of the new compound was determined by chemical and elemental analyses and its formula fits Co(C4H7O5)(2)(H2O)-H-.. IR spectra indicate that Co2+ in the compound is coordinated to the oxygen atom of the carboxyl group. The results of TG-DTG show that the compound is reasonably stable with Co(C4H7O5)(2) and CoO as the intermediate and final product of the thennal decomposition of the compound, respectively. The constant volume combustion energy of the compound, Delta(c)E, is determined by a precise rotating-bomb calorimeter at 298.15 K, to be (-3504.47 +/- 1.64) kJ (.) mol(-1). The calculated standard enthalpy of combustion, Delta(c)H(m)(theta), and standard enthalpy of formation, Delta(f)H(m)(theta)., are 3501.99 +/- 1.64) and (-2170.67 +/- 1.97) kJ (.) mol(-1), respectively.
出处
《有机化学》
SCIE
CAS
CSCD
北大核心
2002年第12期1026-1029,共4页
Chinese Journal of Organic Chemistry
基金
国家自然科学基金 (No .2 0 1710 36 )资助项目
