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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 22, Number 5
JKCSEZ 22(5)
October 20, 1978 

 
Title
Spectrophotometric Study of the Complex Formation of Ferric Ion with Xylenol Orange

Fe(Ⅲ)와 Xylenol Orange의 착물형성에 대한 분광광도법적 연구
Author
Tae Sub O, Sun Haing Lee, Jung Hag Park

오대섭, 이선행, 박정학
Keywords
Abstract
Fe(Ⅲ)과 Xylenol Orange (XO 또는 H6A)의 반응을 분광광도법으로 연구하였다. Fe(Ⅲ)과 XO는 조성이 Fe(Ⅲ) : XO = 2 : 1 및 1 : 1 인 두가지 착물을 형성함을 확인하였다. 2 : 1 착물은 XO보다 Fe(Ⅲ)를 많이 포함한 산성에서 안정하고, 1 : 1 착물은 XO가 많이 포함된 약산성용액에서 안정하다. 흡수극대는 590nm(2 : 1)와 500nm(1 : 1)이고 몰흡광계수는 각각 3.18 ± 0.04 × 104, 1.32 ± 0.03 × 104이다. pH값을 변화시키면서 측정한 두 착물의 안정도상수는 log β21 = 18.69 ± 0.03, log β212 = 42.08 ± 0.09, log β11 = 4.17 ± 0.04, log β113 = 34.47 ± 0.07이었다.

The reaction between iron(Ⅲ) and Xylenol Orange (XO or H6A) has been investigated spectrophotometrically. It has been established that iron (Ⅲ) and XO form two complexes with compositions iron(Ⅲ) : XO = 2 : 1 and 1 : 1. The 2 : 1 complex is stable in acidic medium containing excess of iron, and 1 : 1 complex is stable in slightly acidic medium containing excess of XO. The absorption maxima are at 590 nm (2 : 1) and 500 nm (1 : 1), the molar absorptivities being 3.18 ± 0.04 × 104 and 1.32 ± 0.03 × 104 respectively. The stability constants of two complexes studied by varying pH are log β21 = 18.69 ± 0.03, log β212 = 42.08 ± 0.09, log β11 = 4.17 ± 0.04, and log β113 = 34.47 ± 0.07.

Page
311 - 316
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