B. McCloy

Thermal, structural and electrical studies of the chloro complexes of cobalt, nickel and copper with anthranilamide

Abstract The chloro compounds of anthranilamide with cobalt, nickel and copper have been prepared in ethanolic solution. Solid compounds have been isolated and characterised by elemental analyses, magnetic moments, vibrational and electronic spectra. They have octahedral structures. Thermogravimetry and differential thermal analysis show that all of the compounds lose organic ligand and halogen to give the metal oxide. Electrical conductivities at room temperature show ohmic behaviour and lie in the narrow range 3.60 × 10−8 Ω−1 m−1 (for the nickel complex) to 1.00 × 10−7 Ω−1 m−1 (for the copper complex). The high conductivity of the copper complex, relative to that of the other complexes, is attributed to its polymeric structure. The temperature dependence of conductivity is anomalous. Evidence from IR spectra suggests that such behaviour is a result of premature decomposition which is due to a synergistic effect of applied voltage and temperature.

The preparation and characterisation of a complex of copper with poly(acrylic acid) and an assessment of its suitability as an anti-static additive for polyethylene

Abstract The preparation and some properties of a complex formed between poly(acrylic acid) and copper carbonate are described. Spectral studies indicate that the copper ions are in an octahedral environment. The thermal behaviour of the copper complex has been studied by thermogravimetry and differential thermal analysis. The thermal decomposition study shows that the copper complex (which is hydrated) first loses water, followed by the organic ligand, to give copper oxide. The copper complex as well as poly(acrylic acid) were investigated as possible anti-static additives, but were found to be less effective than commercial additives. However, there is evidence that the copper complex may produce longer lasting anti-static properties.

Thermal, structural and electrical studies of the chloro complexes of cobalt, nickel and copper with 1,10-phenanthroline

Abstract The chloro compounds of 4,7-phenanthroline with cobalt, nickel and copper have been prepared in ethanolic solution and have stoichiometry MLCl2. Solid compounds were isolated and characterised by elemental analyses, magnetic moments, vibrational and electronic spectra. The cobalt and nickel compounds have tetrahedral structures, whereas the copper compound has an octahedral structure. The thermal behaviour of the compounds has been studied using thermogravimetry and differential thermal analysis. An intermediate compound is observed in the decomposition of the cobalt complex. Electrical conductivities at room temperature are reported and all compounds display ohmic behaviour. The ligand molecules make a major contribution to the conduction process.

Structural and thermal studies of a 5-fluorouracil complex of copper

Abstract A green compound of 5-fluorouracil with copper has been prepared in aqueous alkaline solution. The metal complex (characterised by elemental analyses, and vibrational and electronic spectra) has the molecular formula Cu(C 4 H 2 O 2 N 2 F)(OH)(H 2 O) 2 and has a polymeric octahedral structure. The thermal behaviour of this complex has been studied by thermogravimetry and differential thermal analyses. The copper complex decomposes to give a compound of empirical formula CuO · H 2 O.

Structural and thermal studies of the chloro complexes of cobalt, nickel and copper with 2,2-bis(acrylamido)acetic acid and assessment of their suitability as anti-static additives for polyethylene

Abstract The preparation and properties of the complexes of 2,2-bis(acrylamido)acetic acid with cobalt, nickel and copper are described. Spectral, magnetic and solubility studies indicate that the complexes have polymeric octahedral structures. The decomposition of each compound has been studied using thermogravimetry and differential thermal analysis. The complexes, which are hydrated, lose water followed by organic ligand to give the metal oxide. The compound 2,2-bis(acrylamido)acetic acid and its metal complexes have been investigated as possible anti-static additives, but were found to be less effective than the commercial compounds. However, there is evidence that they may produce longer lasting anti-static properties.

Preparation, thermal, structural and electrical studies of dichlorohexa (anthranilamide) cobalt(II) and dichloro (anthranilamide) copper(II)

The chloro compounds of anthranilamide with cobalt and copper were prepared in aqueous solution. Solid compounds were isolated and characterised by analysis, magnetic moments, and vibrational and electronic spectra. They have octahedral structures. Thermogravimetry and differential thermal analysis show that the compounds lose organic ligand and halogen to give the metal oxide. Electrical conductivities at room temperature show ohmic behaviour and lie in the range from 4.50 × 10−8Ω−1m−1 (for the cobalt complex) to 8.80 × 10−8Ω−1 m−1 (for the copper complex). The temperature dependence of conductivity was determined for the compounds and was used to provide a measure of the activation energies for conduction.

The performance of some first row transition metal complexes of anthranilamide and 2,2-bis(acrylamido)acetic acid as colouring materials for polyethylene

Abstract Complexes have been prepared by the reactions of anthranilamide with the chlorides of cobalt, nickel and copper in ethanolic solution, and of 2,2-bis(acrylamido)acetic acid with the carbonates of those elements in aqueous solution. All compounds have octahedral structures. Initial decomposition temperature for each of the complexes was obtained from thermogravimetric studies. The performances of the complexes as colouring materials for polyethylene have been investigated; weather resistance, light fastness, migration resistance and heat stability have been considered. Two complexes, Co(C8H9N2O4)2 and Ni(C8H9N2O4)2, performed well in all tests and show potential as pigments for polyethylene.

The performance of some first row transition metal complexes of 2,6-diaminopyridine and 4-aminobenzoyl hydrazide as colouring materials for polyethylene

Abstract Complexes have been prepared by the reactions of 2,6-diaminopyridine and 4-aminobenzoyl hydrazide with the chlorides of cobalt, nickel and copper in ethanolic solution. One of the compounds has a tetrahedral structure while the remaining compounds have polymeric octahedral structures. The initial decomposition temperature for each of the complexes was obtained from the thermogravimetric studies. The performances of the complexes as colouring materials for polyethylene has been investigated; weather resistance, light fastness, migration resistance and heat stability have been considered. The complex Co 2 (C 5 H 7 N 3 )Cl 4 performed well in all tests and is a suitable material for development as a pigment for polyethylene.

Structural and thermal studies of the chloro complexes of cobalt, nickel and copper with 4-aminobenzoyl hydrazide and an assessment of their suitability as anti-static additives for polyethylene

Abstract The preparation and some properties of the complexes of 2,6-diaminopyridine with the chlorides of cobalt, nickel and copper are described. Spectral, magnetic and solubility studies indicate that the cobalt and nickel complexes have polymeric octahedral structures, whereas the copper complex has a tetragonal structure. The thermal behaviour of these complexes has been studied by thermogravimetry and differerential thermal analysis. The thermal decomposition studies show that the compounds decompose with loss of organic ligand and halogen to give the metal oxide. The complexes were investigated as possible anti-static additives, but were found to be less effective than the commercial compounds. However, there is evidence that they may produce longer lasting anti-static properties.

Thermal, structural and electrical studies of the chloro complexes of cobalt, nickel and copper with 2-butoxypyridine

Abstract The chloro compounds of 2-butoxypyridine with cobalt, nickel and copper were prepared in ethanolic solution from which solid compounds were isolated. The suggested structure for the cobalt compound is tetrahedral, whereas for the nickel and copper compounds it is octahedral. The techniques of thermogravimetry and differential thermal analysis show that the copper compound forms an intermediate compound before the metal oxide is formed. The cobalt and nickel compounds decompose with loss of the organic ligand and chlorine to give the metal oxides. Room temperature electrical conductivities of the prepared compounds show near-ohmic behaviour and are in the narrow range of 2.41 × 10 −8 to 6.33 × 10 −8 Ω −1 m −1 . The temperature dependence of conductivity shows anomalous behaviour. The similarity in electrical properties of the compounds studied suggests that the conductivities are intrinsically controlled.