Reartes G B, Liberman S J, Blesa M A
Comisión Nacional de Energía Atómica, Avenida del Libertador 8250, Buenos Aires 1429, Argentina.
Talanta. 1987 Dec;34(12):1039-42. doi: 10.1016/0039-9140(87)80155-8.
The acidity constants of benzidine (Bz) in aqueous solutions determined potentiometrically at 25 degrees were K(a1) = (1.11 +/- 0.08) x 10(-5), K(a2) = (1.45 +/- 0.12) x 10(-4). The apparent mixed constants in 0.1M sodium nitrate are K(a1) = (5.37 +/- 0.28) x 10(-6) and K(a2) = (1.14 +/- 0.09) x 10(-4). The ultraviolet spectra were recorded as a function of pH and analysed with these constants to obtain the absorption spectra of H(2)Bz(2+), HBz(+) and Bz; the corresponding wavelengths of maximal absorption are 247, 273 and 278 nm, and molar absorptivities 1.63 x 10(4), 1.76 x 10(4) and 2.26 x 10(4) 1.mole(-1).cm(-1).
在25℃下通过电位滴定法测定的联苯胺（Bz）在水溶液中的酸度常数为：K(a1) = (1.11 ± 0.08) × 10⁻⁵，K(a2) = (1.45 ± 0.12) × 10⁻⁴。在0.1M硝酸钠中的表观混合常数为：K(a1) = (5.37 ± 0.28) × 10⁻⁶和K(a2) = (1.14 ± 0.09) × 10⁻⁴。记录紫外光谱随pH的变化，并根据这些常数进行分析，以获得H₂Bz²⁺、HBz⁺和Bz的吸收光谱；最大吸收的相应波长分别为247、273和278nm，摩尔吸光系数分别为1.63 × 10⁴、1.76 × 10⁴和2.26 × 10⁴ 1·mol⁻¹·cm⁻¹。
