J. Birnie

Structural characterisation and thermal analysis studies of the compounds of manganese(II), cobalt(II), nickel(II), copper(II) and zinc(II) with poly(crylic acid)

Abstract The compounds formed by the reaction of poly(acrylic acid) with the carbonates of manganese, cobalt, nickel, copper and zinc in aqueous solution have been prepared. The compounds are all hydrated. Spectral and magnetic properties have been used to deduce the stereochemistry of the compounds. The cobalt and zinc compounds have the metal ions in a tetrahedral environment while the manganese, nickel and copper compounds have the metal ions in an octahedral environment. The thermal behaviour of the compounds has been studied by thermogravimetry and differential thermal analysis. The decomposition studies show that these compounds lose water followed by the organic ligand, to give the metal oxide.

Preparation, characterization, thermal and electrical studies of poly(4-vinylpyridine) and its cobalt(II) bromide complex

Abstract A polymer-metal complex was prepared by complexing cobalt bromide with poly(4-vinylpyridine) in aqueous ethanol. Analysis of the complex shows that its formula is [Co(Vpy) 2 Br 2 ·H 2 O] n , where (Vpy) represents a molecule of 4-vinylpyridine. From spectral and magnetic data, the environment of the cobalt atom is found to be tetrahedral. The metal polymer has been further characterized using gel permeation chromatography, differential thermal analysis and thermogravimetry. The electrical conductivity and its temperature dependence were obtained for the cobalt bromide complex and for poly(4-vinylpyridine). From this work and comparison with earlier work on cobalt chloride complexes of poly(4-vinylpyridine), it is concluded that the metal and halogen atoms play only minor roles in the electrical properties.

Preparation, structural characterization and electrical properties of zinc chloride complexes of 4-vinylpyridine and poly(4-vinylpyridine)

The compound Zn(Vpy)2Cl2, where Vpy is 4-vinylpyridine, has been isolated from ethanolic solution after the reaction of zinc chloride with 4-vinylpyridine. Polymerization of this monomeric compound to [Zn(Vpy)2Cl2]n was achieved. Also, poly(4-vinylpyridine) was reacted with zinc chloride to produce the metal polymer [Zn(Vpy)(H2O)Cl2]′n. Spectral studies showed the environment of the zinc ion in both [Zn(Vpy)2Cl2]n and [Zn(Vpy)(H2O)Cl2]′n to be tetrahedral. The metal polymers have been further characterized by gel permeation chromatography, differential thermal analysis and thermogravimetry; their electrical properties have been studied. The monomer Zn(Vpy)2Cl2 and its polymer each have room temperature electrical conductivities higher (but by factor < 3) than that for poly(4-vinylpyridine). The polymer [Zn(Vpy)(H2O)Cl2]′n, has a much higher conductivity than the other materials, possibly because of the incorporation of water molecules in its structure.

Thermal, spectral and magnetic studies of some first row transition metal complexes of 2-(p-tolyl) pyridine

Abstract Some chloro complexes of cobalt, nickel and copper with 2-( p -tolyl) pyridine have been prepared. The stereochemical configurations of the complexes were deduced using spectral and magnetic properties. The decomposition of the complexes was studied by thermogravimetry and differential thermal analysis.

A study of the performance of cobalt(II) nickel(II) and copper(II) complexes of maleic acid as colouring materials for poly(vinyl chloride) and polystyrene

Abstract Complexes of maleic acid with cobalt, nickel and copper have been prepared. The compounds have polymeric octahedral structures. The performance properties of the complexes as colouring materials for poly(vinyl chloride) and polystyrene have been investigated: weather resistance, light fastness, migration resistance and heat stability have been considered.

Resonance Raman spectroscopy in the determination of the polyene sequence length and the amount of dehydrochlorination of a poly(vinyl chloride) sample containing nickel(II) maleate

Abstract The resonance Raman spectra of a poly(vinyl chloride) sample containing nickel(II) maleate after heat treatment at 170°C are reported. The spectra were used to obtain the conjugated polyene sequence length and the amount of dehydrochlorination of the poly(vinyl chloride) sample.

Thermal, spectral and magnetic studies of some first-row transition metal complexes of adipic acid

Abstract Some compounds of adipic acid with cobalt, nickel and copper have been prepared in aqueous solution. The thermal behaviour of these compounds, as well as the adipic acid, has been studied by thermogravimetry and differential thermal analysis. The transition metal complexes are all hydrated. Thermal decomposition studies show that they lose water, then the organic ligand, to give the metal oxide.

Thermal studies on pyridine-3,4-dicarboxylic acid compounds of cobalt, nickel and copper

Abstract Compounds of pyridine-3,4-dicarboxylic acid with cobalt, nickel and copper have been prepared in aqueous solution. Spectral and magnetic studies have shown that in the cobalt and nickel compounds the metal ion is in an octahedral environment, while in the copper compound the copper atom is in a tetrahedral environment. The thermal behaviour of these compounds has been studied by thermogravimetry and differential thermal analysis. The compounds are hydrated, and they decompose thermally by losing water followed by the organic ligand to give the metal oxide.

A study of the performance of some first row transition metal complexes of 2-(p. olyl)pyridine and 4-aminoquinaldine as colouring materials for polystyrene

Abstract The chloro complexes of 2-(p.tolyl)pyridine and 4-aminoquinaldine with cobalt (II), nickel (II) and copper (II) have been prepared. The 4-aminoquinaldine complexes have polymeric octahedral structures. The cobalt and copper complexes of 2-(p.tolyl)pyridine have tetrahedral and tetragonal structures while the nickel complex has a polymeric octahedral structure. The initial decomposition temperatures of the complexes have been studied by thermogravimetry. The performance of the complexes as colouring materials for polystyrene has been investigated; weather resistance, light fastness, migration resistance and heat stability have been considered.

A study of the performance of bis(acetylsalicylate) copper(II) and the cobalt(II), nickel(II) and copper(II) complexes of pyridine-3,4-dicarboxylic acid as colouring materials for poly(vinyl chloride) and polystyrene

Abstract Bis(acetylsalicylate) copper(II) and complexes of pyridine-3,4-dicarboxylic acid with cobalt, nickel and copper have been prepared. Bis(acetylsalicylate) copper(II) and the complexes of pyridine-3,4-dicarboxylic acid with cobalt and nickel have octahedral structures. The copper complex of pyridine-3,4-dicarboxylic has a tetrahedral structure. The performance properties of the complexes as colouring materials for poly(vinyl chloride) and polystyrene have been investigated: weather resistance, light fastness, migration resistance and heat stability have been considered.