Aluminium In HCl Research Articles

Spectroscopic, Voltammetric and Coordination Studies on Novel Schiff Base Ligand Derived from Fluorenone with Phenyl Thiosemicarbazide. III

Abstract Some new transition metal complexes of the Schiff base ligand (FPTH) formed by condensation of fluorenone with 4-phenylthiosemicarbazide were prepared. Isolation of the solid metal (II) complexes depends on the metal salt used, pH and the reaction conditions. Characterization of these complexes has been made by elemental analyses, molar conductivities, NMR (1H, 13C), magnetic susceptibility, vissible studies and IR spectra. From EPR studies; symmetry and bonding character for paramagnetic copper(II) complex were determined. The polarographic and cyclic voltammetric curves of the Schiff base (FPTH) were recorded in Britton-Robinson buffer series of pH 3–10. The DC polarograms and the cyclic voltammograms exhibited a single 4-electron irreversible diffusion-controled reduction step represented the saturation of C=N and C=S electroactive centers. The corrosion inhibition of aluminium in HCl using FPTH is studied. The antimicrobial activity of ligand and its metal complexes has also been demonstrated.

Polymer complexes: XXIV. Physico-chemical studies on coordination and stability in relation to IR data for poly(cinnamaldehyde-anthranilic acid) complexes of d-block elements

A new homopolymer derived from cinnamaldehyde and 2-substituted aniline and its Cu(II), Ni(II), Co(II), Zn(II), Cd(II) and Hg(II) complexes has been synthesized and characterized by elemental analysis, IR, electronic spectral, EPR, TG, 1H- and 13C-NMR and magnetic susceptibility measurements. The mode of bonding between Cu(II), Ni(II) and Co(II) and the homopolymer has been studied by IR spectrophotometry. The shift in the band positions of the groups involved in coordination has been utilized to estimate the metal-nitrogen bond lengths. The results obtained are in good agreement with the values of metal-nitrogen modes and ligand field splitting energy (10 Dq). The important bands in the IR spectra and the main 1H- and 13C-NMR signals are assigned and discussed in relation to molecular structure. Considerable interest has also been focussed on the synthesis of the homopolymer and polymer metal complexes due to their potential applications. The corrosion inhibition of aluminium in HCl using PCA is studied. The antimicrobial activity of all the metal complex compounds has also been demonstrated.

三角波パルス電流によるＨＣｌ中のアルミニウムのアノードエッチング

三角波パルス電流によるＨＣｌ中のアルミニウムのアノードエッチング

ＨＣｌ溶液中の交流エッチングで生成されるアルミニウム上の皮膜のＴＥＭ観察

Surface films formed during AC etching of aluminum in HCl were stripped from the substrate in Br2/methanol solution and examined by TEM. The granular nature of the film, which was described by Thompson and Wood (1978), was more clearly observed. The film structure seems to be a replication of progressive etch-pits produced in the subsurface.