Porto Raffaella, Furia Emilia
Dipartimento di Chimica, via P. Bucci, Università della Calabria, Arcavacata di Rende, 87036 Rende, Italy.
Ann Chim. 2007 Mar-Apr;97(3-4):187-98. doi: 10.1002/adic.200790004.
The complexation of the Cu2+ ion with 2-Hydroxybenzamide (salicylamide, HL) has been studied, at 25 degrees C, by potentiometric measurements with a glass electrode in NaCIO4 media for ionic strength ranging from 0.5 to 3 mol/dm3. The data are consistent with the formation of the complexes CuH(-1)(HL)+, CuH(-2)(HL)2, Cu2H(-2)(HL)2(2+) and CuH(-2)(HL). The minor species, Cu2H(-2)(HL)2(2+) and CuH(-2)(HL), amount to at least 20% of the total copper. Elaboration of the data according to the Specific Interaction Theory yields the constants valid in the infinite dilution reference state: [formulas: see text] and the interaction coefficients (kg/mol) of complex species with medium ions: b(L-,Na+) = 0.11 +/- 0.03; b(CuH(-1)(HL)+,NaClO4) = 0.17 +/- 0.05; b(CuH(-2)(HL)2,NaClO4) = 0.11 +/- 0.05; b(Cu2H(-2)(HL)2(2+),NaClO4) = 0.2(7) +/- 0.1; b(CuH(-2)(HL),NaClO4) = -0.0(3) +/- 0.1.
在25℃下，于离子强度范围为0.5至3mol/dm³的NaClO₄介质中，使用玻璃电极通过电位测量法研究了Cu²⁺离子与2-羟基苯甲酰胺（水杨酰胺，HL）的络合作用。数据表明形成了络合物CuH⁻¹(HL)⁺、CuH⁻²(HL)₂、Cu₂H⁻²(HL)₂²⁺和CuH⁻²(HL)。次要物种Cu₂H⁻²(HL)₂²⁺和CuH⁻²(HL)至少占总铜量的20%。根据特定相互作用理论对数据进行精细处理，得出在无限稀释参考状态下有效的常数：[公式：见原文]以及络合物物种与介质离子的相互作用系数（kg/mol）：b(L⁻,Na⁺)=0.11±0.03；b(CuH⁻¹(HL)⁺,NaClO₄)=0.17±0.05；b(CuH⁻²(HL)₂,NaClO₄)=0.11±0.05；b(Cu₂H⁻²(HL)₂²⁺,NaClO₄)=0.2(7)±0.1；b(CuH⁻²(HL),NaClO₄)=-0.0(3)±0.1。
