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Co(II)-이온교환된 합성 α-Zirconium Phosphate의 특성 연구

Characterization of Cobalt(II)-Exchanged Synthetic α-Zirconium Phosphate

장종산 박상언 이영길

Chang JS Park SE Lee YK

HWAHAK KONGHAK, June 1989, 27(3), 323-330(8), NONE

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Abstract

고결정성의 α-지르코늄 포스페이트[Zr(HPO₄)₂ㆍH₂O ; 이하 α-ZrP]를 합성하였다. 합성된 α-ZrP에 코발트(II) 아세테이트 수용액을 사용하여 Co(II)-이온교환된 α-ZrP[이하 Co(II) α-ZrP]를 제조하여 그 특성을 조사하였다. α-ZrP의 프로톤과의 이온교환으로 Co(II) 이온이 층간 간격 내로 주입되어 기존의 α-Zrp와는 다른 ZrCo(Po₄)₂ㆍ4H₂O의 상을 생성하였다. 그에 따라 층간 간격은 α-ZrP의 7.54Å에서 9.68Å으로 확장되었다. 이온교환된 Co(II) 이온은 high spin상태로α-ZrP의 층간 간격 속에 물이 배위된 착체로서 안정하게 존재함을 관찰하였다. Co(II)에 배위되어 있는 4분자의 물은 암모니아와 같은 극성의 리간드에 의해 쉽게 치환이 가능했음을 보았다.

The highly crystalline zirconium bis(monohydrogen orthophosphate)monohydrate[Zr(HPO₄)₂ㆍH₂O; hereinafter α-ZrP]was synthesized. Co(II)-exchanged α-ZrP[hereinafter Co(II)α-ZrP]was prepared by the ion-exchange method using aqueous cobalt(II) acetate solution, and its characteristics were studied. Cobalt(II) cations were ion-ex-changed into the proton sites of α-ZrP and as the result of cobalt ion-exchange a new phase of ZrCO(PO₄)₂ㆍ4H₂O was formed. And the interlayer spacing of Co(II)α-ZrP was expanded from 7.54Å ofα-ZrP to 9.68Å. The ion-exchanged co-balt(II) cations seemed to be stabilized in the interlayer spacings of α-ZrP by forming the water coordinated complexes as a high spin state of cobalt. Four molecules of water could be ligated into cobalt(II) cations and these seemed to be easily exchanged with the polar ligand such as an ammonia.

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