Acta Phys. -Chim. Sin. ›› 1991, Vol. 7 ›› Issue (01): 82-86.doi: 10.3866/PKU.WHXB19910113

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Thermodynamic and Calorimetric Study on the Formation of Binary Complex Compounds of Nickel(II) with some α-Amino Acids and Oxalate

Lin Hua-Kuan; Zhou Zhi-Fen; Gu Zong-Xin; Chen Rong-Ti   

  1. Department of Chemistry, Nankai University, Tianjin
  • Received:1989-10-12 Revised:1990-06-02 Published:1991-02-15
  • Contact: Lin Hua-Kuan

Abstract: The stability constants of binary complex compounds of nickel (Ⅱ) with Lproline, L-valine, α-aminoisobutyric acid and oxalate were determined at 25.0±0.1 ℃, Ⅰ=0.1 mol·dm~(-3) (KNO_3) by pH method. The heats of formation of these binary systems and the heat of protonation of oxalate were determined by calorimetry under the same conditions. The fact that the heat effect of protonation of oxalate was found to be endothermic can be interpreted on account of the existence of seven membered ring of oxalate formed in aqueous solution through hydrogen bonds with water molecule.

Key words: Nickel(II), α-aminoisobutyric acid, Calorimetry, Heat of formation, Heat of protonation