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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 8, Number 4
JKCSEZ 8(4)
August 20, 1964 

 
Title
Study on Metal Cupferrate Complex (Part Ⅳ). Determination of Vanadium (Ⅳ) and Vanadium (Ⅴ) Cupferrate Compositions

Metal Cupferrate Complex 에 관한 연구 (제4보) Spectrophotometry 에 의한 바나듐 (Ⅳ) 및 바나듐 (Ⅴ)-Cupferrate 의 화학조성의 결정
Author
Si-Joong Kim

김시중
Keywords
Abstract
유기용매(benzene)에 의한 추출법을 이용하고, 분광광도법에 의한 몰비법과 연속변화법을 써서, V(IV)-cupferrate와 V(V)-cupferrate의 화학저성이 숭ㅇ액상에서 유기용매상으로 분배된 다음에도 쌍하지 않을 것이라는 가정밑에서, 수용액의 산성도에 따르는 cupferrate 착화합물의 화학조성을 결정하였다. V(IV)- cupferrate의 benzene 용매에서의 최대흡광파장은 pH에 따라 445mμ또는 450mμ이고, V(V)-cupferrate의 그것은 pH 1.8이하에서는 pH에 445mμ이었다. V(V)-cupferrate의 화학조성은 침전이 형성되는 수용액의 pH에 따라 다르며, pH 1.0 이하에서는 VCup4, pH 1.3∼1.7에서는 HVOCupf3 또는 VCupf4와 VOCupf2의 거의 같은 몰씩으로된 혼합물이고, pH 1.8∼1.7에서는 HVOCupf3 또는 VCupf4와 VOCupf2의 거의 같은 몰씩으로된 혼합물이고, pH 1.8∼4.3에서는 VOCupf2이었다. V(V)-cupferrate 의 화학조성은 수용액의 pH에 따라 변화가 없고, pH 1.8 이하에서는 HvO2Cuf2이었다.

Vanadium (Ⅳ) and vanadium (Ⅴ) cupferrate compositions in benzene phase were determined by molar ratio method and continuous variation method spectrophotometrically at 450mμ or 445mμ of wavelength. Compositions of vanadium (Ⅳ) cupferrates, V(Ⅳ)/Cupf, varied from 1/2 to 1/4 with the acidity of solution from which the complexes were precipitated. The complexes precipitated were vanadium(Ⅳ) cupferrate (VCupf4) in solution with lower pH than 1.0, and vanadyl(Ⅳ) cupferrate (VOCupf2) in solution with 1.8-4.3 of pH. It was considered, however, that the complexes in solution with 1.3-1.7 of pH might be hydrogen vanadyl(Ⅳ) cupferrate (HVOCupf3) or nearly equimolar mixture of VCupf4 and VOCupf2 complexes. Vanadium (Ⅴ) cupferrate composition did not vary with the acidity of solution from which the complexes were precipitated. In solution with lower pH than 1.8, the complex precipitated was hydrogen vanadyl (Ⅴ) cupferrate, HVO2Cupf2.

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