Chinese Journal of Applied Chemistry

Chinese Journal of Applied Chemistry ›› 1993, Vol. 0 ›› Issue (6): 31-34.

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EXTRACTION OF SCANDIUM PICRATE BY CROWN ETHER AND CRYSTAL STRUCTURE OF BENZO-15-CROWN-5 PICRATE COMPLEX

Zhou Zhixian1, Du Chenxia1, Zhou Zonghua2, Yu Kaibei3, Zhou Zhongyuan3   

  1. 1. Department of Chemistry, Zhengzhou University, 450052 Zhengzhou;
    2. Department of Chemistry, Sichuan University, Chengdu;
    3. Analysis and Testing Center of Chengdu Branch, Chinese Academy of Sciences, Chengdu
  • Received:1993-02-23 Revised:1993-06-29 Published:1993-12-10 Online:1993-12-10

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Abstract: The extraction of scandium picrate by benzo-15-crown-5 (B15C5) and dibenzo-18-crown-6(DB18C6) has been studied. The compositions of the extracts have been determined by the slope analysis method as Sc (B15C5)1.5(OH) (Pi)2 and Sc (DB18C6) (OH) (Pi)2 (Pi=pi-crate ion) with apparent extraction equilibrium constants logKex=5.69 and 3.59 (25℃), respectively. The crystal of the Sc(B15C5)Pi3·2H2O·CH3CN belongs to triclinic system,space group P1, a=1.2678(2), b=1.3764(3), c=1.9440(4)nm, α=81.03(2)°, β=70.88(1)°, γ=70.71(2)°, Z=2. The mechanism of the extraction has been elucidated.

Key words: scandium picrate, crown ether, extraction, crystal structure

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