769. Magnetic properties of some metal carboxylates

Herron, Rory; Pink, Richard

doi:10.1039/jr9560003948

Cited by 13 publications

(3 citation statements)

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“…Copper salts of carboxylic acids adopt a structure in which two copper atoms are bridged by four carboxylate groups, as in copper acetate ͑van Niekerk and Schoening, 1953͒. A similar structure has been proposed for copper palmitate and stearate ͑Herron and Pink, 1956;Stommen et al, 1987͒. Therefore the copper soaps are quite different from the zinc and lead soaps, which would explain why they divert from the trend observed for the latter.…”

Section: Resultsmentioning

confidence: 90%

X-ray powder diffraction data for selected metal soaps

Corbeil¹,

Robinet²

2002

Powder Diffr.

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In order to better characterize metal soaps found in paint films or on metal surfaces, several metal soaps were synthesized and their X-ray powder diffraction patterns measured. Metal soaps were obtained from four different fatty acids found in drying oils, two saturated (palmitic and stearic acids) and two unsaturated (oleic and linoleic acids), and from copper, zinc, and lead, three metals that are typically found in metal alloys and paint systems. X-ray powder diffraction data are reported for the following compounds: palmitic acid, stearic acid, zinc palmitate, zinc stearate, zinc oleate, zinc linoleate, copper palmitate, copper stearate, copper oleate, lead palmitate, lead stearate, and lead oleate. Features that are characteristic of specific compounds were observed. Soaps obtained from different fatty acids with the same metal ion show differences, as do soaps obtained with the same fatty acid but with different metal ions. Differences were observed when X-ray powder diffraction data obtained for stearic acid and zinc stearate were compared to published data for these two compounds (PDF 38-1923 and 5-0079, respectively). In the case of stearic acid, differences could be explained by the fact that the specimen reported previously in PDF 38-1923 was likely contaminated with palmitic acid. In the case of zinc stearate, low angle data were missing from the original pattern PDF 5-0079 and peaks that were reported in other angular regions in fact consisted in more peaks that were not resolved due to broadening.

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Section: Resultsmentioning

confidence: 90%

X-ray powder diffraction data for selected metal soaps

Corbeil¹,

Robinet²

2002

Powder Diffr.

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“…From IR, UV and magnetic susceptibility results, he concluded that the red dihydrate and blue anhydrate are octahedral and tetrahedral complexes, respectively, whose structure formulas are proposed by Harron and Pink. 21 Namely, the red hydrate is in an octahedral structure coordinated with two carboxylate ions and two aqua ligands, while the blue anhydrate 1s m a tetrahedral structure co- ordinated with two carboxylate ions. The pink Co(II) stearate had a chemical composition nearer to the red dihydrate than the blue anhydrate but its composition was somewhat indefinite.…”

Section: Discussionmentioning

confidence: 99%

Formation and Thermochromism of Coordination Compound of Poly(ethylene-co-methacrylic acid-co-methacrylato) with Co(II) and Its Adducts of 1,3-Bis(aminomethyl)cyclohexane

Yano

Tadano

Hirasawa

et al. 1991

Polym J

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ABSTRACT:The structures of coordination compound of poly(ethylene-co-methacrylic acid-co-methacrylato) with Co(II) and its adducts of 1,3-bis(aminomethyl)cyclohexane (BAC) were studied from visible spectral and ESR measurements in the temperature range from room temperature to 130°C. The Co(II) complexes were in an octahedral coordination at room temperature, but transformed into a tetrahedral coordination with increasing temperature. The Co(Il) complexes coordinated with BAC were in the tetrahderal one, regardless of temperature. The transformation from octahedral to tetrahedral structure was closely associated with the order-disorder transition of ionic clusters.KEY WORDS Ethylene Ionomer I Co(II) Complexes I Co(II) Complxes with 1,3-Bis(animomethyl)cyclohexane I UV-Visible Spectra 1 ESR Spectra I Thermochromism I Ionomers are polymeric materials consisting of hydrophobic organic backbone chains and small amounts of ionic groups attached pendantly to the backbone chains. 1 -3 The hydrophilic ionic groups are frequently separated from the hydrophobic polymer matrix to form aggregations such as multiplets and ionic clusters. The formation of the ionic clusters is known to profoundly influence various physical properties of ionomers by a rigid crosslinking effect. To date, therefore, the structural studies of ionic clusters have been extensively conducted by many researchers. 1 -4 Many morphological models have been proposed for the ionic clusters but have not lead to final conclusions because of the colloidal size of the ionic clusters. Very recently we proposed a new model for the structure and nature of the ionic clusters, named the order-disorder transition of ionic clusters. 5 The ionic clusters are ordered assemblies of ionic groups at room temperature, and the insides of the ionic clusters transform into a disordered state at a transition temperature (TJ, although the ionic clusters, themselves, are not destroyed at much higher temperatures above Ti.During the past decade, interest has been directed to ionomers containing paramagnetic transition metal ions, from the view point that paramagnetic properties may provide new information on structures and ionic aggregations of transition metal ions in a polymer 969

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“…The presence of this intermediate a Total BzOH added to the system including the initial charge, make-up, and acid combined with the catalyst. 6 Calculated from CO2 value assuming 05 = 2002. c Primarily PhCOOPh with some PhOPh. For ease of calculation, all of former assumed.…”

Section: ó Industrial and Engineering Chemistrymentioning

confidence: 99%