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作 者:杨德俊[1] 李旭[1] 胡吉林[1] 姚飞虹[1] 肖圣雄[1] 杨丽兰[1] 向宥霖[1] 李强国[1]
出 处:《化学学报》2010年第23期2373-2380,共8页Acta Chimica Sinica
基 金:国家自然科学基金(No.20973145);湖南省科技厅科研计划基金(No.2009PT4085);郴州市科技局科研计划基金(No.2008g106);湘南学院科研基金(No.08Y030);湖南省教育厅大学生研究性学习和创新性实验计划项目基金(No.09-326)资助项目
摘 要:合成了一种新的烟酸锰配合物,并通过红外光谱﹑热重差热分析﹑元素分析﹑化学分析等手段确定其结构与组成.应用溶解量热法,分别测定了四水氯化锰、烟酸和烟酸锰在常压,298.15 K,混合溶剂(VDMSO∶VEtOH∶V2 mol/L HCl=1∶1∶1)中的溶解焓,△s Hm[MnCl2·4H2O(s),298.15 K]=-(13.596±0.170)kJ·mol-1,△s Hm[2C6H5NO2(s),298.15 K]=(42.780±0.090)kJ·mol-1以及△s Hm[[Mn(C6H4NO2)2]·2H2O,298.15 K]=(15.936±0.070)kJ·mol-1.根据热化学原理求出了反应MnCl2·4H2O(s)+2C6H5NO2(s)=[Mn(C6H4NO2)2]·2H2O(s)+2HCl(g)+2H2O(l).在298.15 K时标准摩尔反应焓△r Hm(1)=(66.42±0.88)kJ·mol-1和配合物[Mn(C6H4NO2)2]·2H2O(s)的标准摩尔生成焓△f Hm[[Mn(C6H4-NO2)2]·2H2O(s),298.15 K]=-(1554.8±2.0)kJ·mol-1.应用TAM air热导式等温微量量热仪测定了烟酸锰配合物[Mn(C6H4NO2)2]·2H2O在301.15 K时对粟酒裂殖酵母细胞生长代谢的产热曲线,计算得到了粟酒裂殖酵母细胞生长速率常数k,最大放热功率时间tp以及总放热量Qtotal等热化学参数.实验结果表明,随着烟酸锰配合物浓度的增加,粟酒裂殖酵母细胞生长代谢速率常数k和总放热量Qtotal减少,即烟酸锰对粟酒裂殖酵母细胞有抑制作用.In the paper,[Mn(C6H4NO2)2]·2H2O(s) was synthesized and characterized by IR,elemental analysis and thermogravimatric analysis.The standard molar enthalpies of solution of [MnCl2·4H2O(s)], [2C6H5NO2(s)],and [[Mn(C6H4NO2)2]·2H2O(s)] in a mixed solvent of absolute ethyl alcohol,dimethyl sulfoxide(DMSO) and 2 mol·L-1 HCl were determined by calorimetry to be △s Hm[MnCl2·4H2O(s), 298.15 K]=-(13.596±0.170) kJ·mol-1,△s Hm[2C7H6O3(s),298.15 K]=(42.780±0.090) kJ·mol-1 and △s Hm[[Mn(C6H4NO2)2]·2H2O(s),298.15 K]=(15.936±0.070) kJ·mol-1.The enthalpy change of the reaction MnCl2·4H2O(s)+2C6H5NO2(s)=[Mn(C6H4NO2)2]·2H2O(s)+2HCl(g)+2H2O(l) was determined to be △r Hm(1)=(66.42±0.88) kJ·mol-1.From date in the literature,through Hess' law,the standard molar enthalpy of formation of [Mn(C6H4NO2)2]·2H2O(s) was estimated to be △f Hm[[Mn(C6H4NO2)2]·2H2O(s),298.15 K]=-(1554.8±2.0) kJ·mol-1.The thermokinetic properties of the action of the manganese nicotinate on growth metabolism of S.pombe were studied by means of a TAM air isothermal calorimeter at 301.15 K.The microbial growth rate constant k,the values of the peak time tp and the total thermal effects Qtotal,were obtained,respectively.Experimental results show that the k and Qtotal values of S.pombe decreased with the increase in the concentrations of the niacin manganese and the compound has good inhibition action on the growth of S.pombe.
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