Solvent Extraction Studies on Copper(II) and Silver(I) Complexes of Bis(4‐hydroxypent‐2‐ylidene)diaminoethane: Composition of Extracted Copper(II) Species

Abstract

Copper(II) complexes of bis(4-hydroxypent-2-ylidene)diaminoethane (BHPDE) were prepared by extractive method. Job’s continuous variation and equilibrium constant methods, as well as spectral and elemental analyses were applied in the determination of the nature of extracted species. The results indicate the formation of mixed ionic complexes of the types Cu(H2L)X2, Cu(H2L)2X2and CuL (where H2L = BHPDE and X = NO3-, CIO4-, Cl-or ½SO42-). Cu(H2L)X2and Cu(H2L)2X2predominate at low pH extractions while CuL chelate predominates at high pH extraction. The complexes exist in two isomeric forms, the blue readily-water-soluble and the violet less water-soluble forms. Both complexes show maximum absorption at 540 nm and molar absorptivity values of about 2.0 x 102dm3mole-1cm-1.

Complex Formation and Extraction Studies of N, N -Bis (salicylidene)-3,5-diaminobenzoic Acid on Hg(II) and Ag(I)

“…The molar absorptivity of the two complexes is appreciably increased in intensity than for the ligand. At higher wavelength, the extra peaks in both complexes is due to metalligand charge transfer (MLCT) band 6 indicating the formation of chelate complex thus creating extra chelate ring 7 . There is no indication of a d ← d electron transitions in both complexes 8 .…”

“…The extraction of Ag(I) with 1% H 2 B/CCl 4 was studied in HNO 3 , H 2 SO 4 and HClO 4 at concentrations 10 -3 -2.0 M. Ag(I) reacts rapidly with HCl to give AgCl as precipitate. HCl was therefore not used in studying the extraction of Ag(I) in acid medium 7 . The extraction pattern of Ag(I) is almost the same as that of Hg(II) (Figure 3b).…”

Effect of Order of Reagents Addition on Optical and Structural Properties of CdS Quantum Dot Prepared by Chemical Bath Deposition Technique

“…Table 3 shows that the deposition of the films in an acid medium gave rise to generally nonhomogeneous films of low thickness, while in an alkaline medium the deposited CdS-QDs were homogeneous with appreciably high film thickness except at pH 10.These results indicate the importance of a complexing agent in the deposition process of QDs. The suggested reaction steps for the deposition of the CdS-QDs using a tetradentate ligand at pH 8-10 are given in At low pH, the undissociated H2EDDBP and its protonated forms (H3EDDBP + andH4EDDBP +2 ) predominate [25], and the hydrolysis of thiourea to form the bisulfide ion SH -(Equation 8) is limited. These conditions could be responsible for the observed formation of non-homogeneous films of low thickness at low pH.…”

Predictive Simulation and Optimization Oriented Modeling for the Extraction of Metal Ions From Solutions Into a Novel Bis-Schiff Base

“…Recovery of metals such as Ni, Co, Pb, Zn, Fe, Cr and Mn from aqueous solutions using liquid-liquid extraction technique achieved by direct contact between the aquo-metal solution and the chelating agent dissolved in an organic diluent has been severally researched [1]. Complexing agents such as Schiff bases, oximes, crown ethers, phosphine oxides and several amines have routinely been used as metal extractants in consideration of their system pH dependence and high distribution coefficient [2]. The application of solvent extraction to inorganic system has enjoyed much acceptance because of its wide scope, ease of manipulation, speed, simplicity and selectivity [3][4].…”