Coordination chemistry of chelating resins and ion exchangers

Synthesis, characterization and biological activity of some transition metals with Schiff base derived from 2-thiophene carboxaldehyde and aminobenzoic acid.

In recent years linear polymers containing transition metals have attracted much interest. There are two types of organometallic polymers in which the metal-containing portion is either a part of the polymer main chain or bound to the polymer as a pendant group. In this article the recent studies on the former type of linear polymers are reviewed on the basis of the following three parts: 1 metallocene-containing polymers; 2 linear “Werner-type” coordination polymers; 3 polymers containing sigma-bonded transition metals in the main chain. The main part of this review is devoted to a new class of soluble metal-poly-yne polymers in which transition metal atoms are joined in the main chain by a metal-carbon σ-bond.

Linear polymers containing transition metals in the main chain

New metal complexes of Fe(III), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) with salicylidine-2-aminobenzimidazole (SABI) are synthesized and their physicochemical properties are investigated using elemental and thermal analyses, IR, conductometric, solid reflectance and magnetic susceptibility measurements. The base reacts with these metal ions to give 1:1 (Metal:SABI) complexes; in cases of Fe(III), Co(II), Cu(II), Zn(II) and Cd(II) ions; and 1:2 (Metal:SABI) complexes; in case of Ni(II) ion. The conductance data reveal that Fe(III) complex is 2:1 electrolyte, Co(II) is 1:2 electrolyte, Cu(II), Zn(II) and Cd(II) complexes are 1:1 electrolytes while Ni(II) is non-electrolyte. IR spectra showed that the ligand is coordinated to the metal ions in a terdentate mannar with O, N, N donor sites of the phenloic -OH, azomethine -N and benzimidazole -N3. Magnetic and solid reflectance spectra are used to infer the coordinating capacity of the ligand and the geometrical structure of these complexes. The thermal decomposition of the complexes is studied and indicates that not only the coordinated and/or crystallization water is lost but also that the decomposition of the ligand from the complexes is necessary to interpret the successive mass loss. Different thermodynamic activation parameters are also reported, using Coats-Redfern method.

Salisaldehyde-2-aminobenzimidazole schiff base complexes of Fe(III), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II)

Pd loaded amphiphilic COF as catalyst for multi-fold Heck reactions, C-C couplings and CO oxidation

Manfred Riederer

Papers

Addition Compounds with Polymeric Chromium(II)‐Schiff Base Complexes

Preparation and thermal stability of polymeric metal chelates with schiff bases

Additionsverbindungen mit polymeren Chrom(II)‐Schiffbase‐Komplexen

Palladium(II)‐ und Platin(II)‐Komplexe mit polymeren Schiffbase‐Liganden

Molecular Sieve Properties of Polymeric Schiff Base‐Metal Complexes