Spectrophotometric studies on ion-pair extraction equilibria of the iron(ii) and iron(III) complexes with 4-(2-pyridylazo)resorcinol.
Spectrophotometric studies on ion-pair extraction equilibria of the iron(ii) and iron(III) complexes with 4-(2-pyridylazo)resorcinol.
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铁(ii) 和铁(III) 与4-(2-吡啶偶氮)间苯二酚配合物的离子对萃取平衡的分光光度研究。
DOI：
10.1016/0039-9140(84)80133-2
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发表时间：
1984
期刊：
影响因子：
6.1
通讯作者：
T. Yotsuyanagi
中科院分区：
文献类型：
--
作者：
H. Hoshino;T. Yotsuyanagi
The ion-pair extraction equilibria of the iron(II) and iron(III) chelates of 4-(2-pyridylazo)resorcinol (PAR, H2L) are described. The anionic chelates were extracted into chloroform with benzyldimethyltetradecylammonium chloride (QC1) as counter-ion. The extraction constants were estimated to beKex1Fe(II)= [Q⪢{FeII(HL)L⪢}]0/[Q+][⪢{FeII(HL)L⪢}−] = 108.59 ± 0.11,Kex2Fe(II)= [Q2⪢{FeIIL2⪢}]o/ [Q+]2[⪢{FeIIL2⪢}2−] = 1012.17 ± 0.10andKex1Fe(III)= [Q⪢{Fe(III)L2⪢}]o/(Q+][⪢{FeIIIL2⪢}−] = 106.78 ± 0.15atI= 0.10 and 20°, where [ ]ois concentration in the chloroform phase. Aggregation of Q⪢{FeIIIL2⪢} in chloroform was observed and the dimerization constant (Kd= [Q2⪢{FeIIIL2⪢}2]o/[Q⪢{FeIIIL2⪢}]o2) was evaluated as logKd= 4.3 ± 0.3 at 20°. The neutral chelates of ⪢{FeII(HL)2⪢} and ⪢{FeIII(HL)L⪢}, and the ion-pair of the cationic chelate, ⪢{FeIII(HL)2⪢}ClO4, were also extracted into chloroform or nitrobenzene. The relationship between the forms and extraction properties of the iron(II) and iron(III) PAR chelates are discussed in connection with those of the nickel(II) and cobalt(III) complexes. Correlation between the extraction equilibrium data and the elution behaviour of some PAR chelates in ion-pair reversed-phase partition chromatography is also discussed.
The ion-pair extraction equilibria of the iron(II) and iron(III) chelates of 4-(2-pyridylazo)resorcinol (PAR, H2L) are described. The anionic chelates were extracted into chloroform with benzyldimethyltetradecylammonium chloride (QC1) as counter-ion. The extraction constants were estimated to beKex1Fe(II)= [Q⪢{FeII(HL)L⪢}]0/[Q+][⪢{FeII(HL)L⪢}−] = 108.59 ± 0.11,Kex2Fe(II)= [Q2⪢{FeIIL2⪢}]o/ [Q+]2[⪢{FeIIL2⪢}2−] = 1012.17 ± 0.10andKex1Fe(III)= [Q⪢{Fe(III)L2⪢}]o/(Q+][⪢{FeIIIL2⪢}−] = 106.78 ± 0.15atI= 0.10 and 20°, where [ ]ois concentration in the chloroform phase. Aggregation of Q⪢{FeIIIL2⪢} in chloroform was observed and the dimerization constant (Kd= [Q2⪢{FeIIIL2⪢}2]o/[Q⪢{FeIIIL2⪢}]o2) was evaluated as logKd= 4.3 ± 0.3 at 20°. The neutral chelates of ⪢{FeII(HL)2⪢} and ⪢{FeIII(HL)L⪢}, and the ion-pair of the cationic chelate, ⪢{FeIII(HL)2⪢}ClO4, were also extracted into chloroform or nitrobenzene. The relationship between the forms and extraction properties of the iron(II) and iron(III) PAR chelates are discussed in connection with those of the nickel(II) and cobalt(III) complexes. Correlation between the extraction equilibrium data and the elution behaviour of some PAR chelates in ion-pair reversed-phase partition chromatography is also discussed.