学术论文

      甲醇-水二元混合物中Co(bpb)与叠氮离子反应的动力学研究

      Kinetics Studies of the Reaction of Co(bpb) with the Azide Ion in Binary Methanol-Water Mixtures

      Abstract:
      Co(bpb)[bpbH2 is N,N'-o-phenylenebis(pyridine-2-carboxamide),C18H12N4O2] complex has active axial sites like a porphyrin complex.We studied the coordination of azide ion (N3-) to Co(bpb) in binary methanol-water mixtures by spectropbotometric method at the temperature range of 283-303 K.From the temperature dependence of the rate constant,activation parameters (Ea,△H#,△S#,and △G# were obtained.An isokinetic temperature at about 302 K was observed at which the formation rate of Co(bpb)-N3- was more or less independent of the solvent composition.The resulting △H against TAS plot showed a good linear correlation,indicating the existence of enthalpy-entropy compensation in azide complexation process.Under optimum conditions and based on the absorbance of Co(bpb)-N3- produced through complex formation,a spectrophotometric method for the determination of N3- in solution was developed.A linear relationship between the absorbance and N3- concentration was obtained in the range of (0.85-5.00)× was applied to the determination of N3- anion in real water samples.Key Words: Spectrophotometric;Kinetics;Binary mixture;Azide determination;Water sample
      Author: HASHEMI Javad ALIZADEH Naader MEGHDADI Soraia AMIRNASR Mehdi
      刊 名: 物理化学学报 ISTICSCIPKU
      年,卷(期): 2009, 25(6)
      分类号: O6
      机标分类号: S51 S12
      在线出版日期: 2009年7月3日
      基金项目: the Tarbiat Modares University Research Council