LINEAR ENTHALPY RELATIONSHIPS BETWEEN HEATS OF FORMATION OF COMPLEX COMPOUNDS AND HEATS OF PRO TONAT

• 作 者: 陈荣悌 古宗信 林华宽 刘恒潜
• 机 构: Department of Chemistry, Nankai University, Tianjin,Department of Chemistry, Nankai University, Tian
• 出 处: Science in China,Ser.B
• 发表日期: 1985年11期
• 关键词: heats conform substituted constants ethanol COPPER GLYCINES enthalpy hydroxide e

The heats of protonation of N-(para-substituted phenyl) glycines (R—C_6H_4—NHCH_2COOH, R=CH_3O, CH_3, H, C1) and the heats of formation of these amino acids with copper(Ⅱ) have been determined calorimetrically at 25℃ in 30% (v/v) ethanol in the presence of 0.1M sodium perchlorate. The data obtained conform nicely to the equation △H_(ML)-Q-β△H_(HL) where △H_(ML) denotes the heats of formation of complex compounds, △H_(HL) denotes the heats of protonation of the ligands, and Q and β are constants.

The heats of protonation of N- (para-substituted phenyl) glycines (R-C_6H_4-NHCH_2COOH, R = CH_3O, CH_3, H, Cl) and the heats of formation of these amino acids with copper (II) have been determined calorimetrically at 25 ° C in 30% (v / v) ethanol in the presence of 0.1M sodium perchlorate. The data obtained conform nicely to the equation ΔH_ (ML) -Q-βΔH_ (HL) where ΔH_ (ML) heats of formation of complex compounds, ΔH_ (HL) denotes the heats of protonation of the ligands, and Q and β are constants.