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4,4'-비스-(2-보로노-4-히드록시-벤젠아조)-비페닐의 합성 및 산 염기 지시약으로서의 성질
임용진,윤남식,이석률 慶北大學校 1986 論文集 Vol.41 No.-
A dye, 4,4'-bis-(2-borono-4-hydroxy-benzeneazo)-biphenyl, was synthesized by coupling benzidine tetrazonium salt with m-hydroxybenzeneboronic acid. The dye was soluble in alcohol and it's maximum absorption wavelength (λ_max) and molar extinction coefficient(ε) in ethyl alcohol were 466㎚ and 3.81× 10 exp (4) respectively. The color of the dye was pale yellow(λ_max 400㎚) in acidic aqueous solution and deep blue (λ_max 581㎚) in alkaline aqueous solution, indicating the possibility of using as a neutralization titration indicator. The transition range of the dye as titration indicator was shown to be pH 7.3-8.5 and the equilibrium constant (K_HIn) was 1.90× 10 exp (-8). When the dye was compared with phenolphthalein in the neutralization titration experiment, similar results were obtained.