高等学校化学学报 ›› 1985, Vol. 6 ›› Issue (4): 285.

• 研究论文 •    下一篇

冠醚配合物热力学性质的研究(Ⅴ)——碱金属及碱土金属离子与2,3-苯并-11-甲基-18-冠-6的配位反应的量热滴定研究

沈孟长, 罗勤慧, 王志林, 陆国元, 胡宏纹   

  1. 南京大学化学系
  • 收稿日期:1983-10-29 出版日期:1985-04-24 发布日期:1985-04-24
  • 基金资助:

    自然科学基金

Studies on Thermodynamics of Crown Coordination Compounds(V)—Calorimetric Titration for Coordination Reaction of 2,3-Benzo-11-Methy 1-18-Crown-6 with Alkali and Alkaline Earth Metal Ions

Shen Mengchang, Luo Qinhui, Wang Zhilin, Lu Guoyuan, Hu Hongwen   

  1. Department of Chemistry, Nanjing University, Nanjing
  • Received:1983-10-29 Online:1985-04-24 Published:1985-04-24

摘要: 用自制滴定量热计研究了70%(W/W)甲醇中2,3-苯并-11-甲基-18-冠-6(BC1-18C6)与Na、K、Rb、Cs、Ca、Mg、Sr、Ba8种碱金属与碱土金属氯化物的配位作用,直接计算了配合物稳定常数及配位反应热函,获得了碱金属与碱土金属稳定性及热函大小的相对顺序.

Abstract: The coordination reactions of 2,3-benzo-11-methyl-18-crown-6(BCl-18C6) with eight alkali and alkaline earth (Na,K,Rb,Cs, Mg, Ca,Sr,Ba) chlorides were determined at 30℃ and in 70% W/Wmethanol by self-made titralion calorimeter. The stability constants of coordination compounds and the enthalpy of coordination reaction were calculated directly. Because the space hindrance gives a weaker effect to small metal ions than to large ones, and the space hindrar.ce of crown with only one methyl is weak, the stability sequence of alkali metal coordination compounds is K> Rb>Na≥Cs and is different from that of 2, 3-benzo-8, 11, l5-trimethyl-18-crown-6 (BC3-18C6). Furthermore, the stability constants of (BC3-18C6) coordinition compounds with Mg and Ca are even higher than those of BC1-18C6 pnes because of the small radii of Mg and Ca.

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