Structures of magnesium and zinc long aliphatic chains carboxylates

Mesbah, Adel; Juers, C.; François, Michel; Rocca, Emmanuel; Steinmetz, J.

doi:10.1524/zksu.2007.2007.suppl_26.593

Cited by 11 publications

(16 citation statements)

References 3 publications

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“…For ZnC 11 , there were alternating ZnO 4 tetrahedrons along the a-axis whilst for ZnC 12 and ZnC 14 , this was not observed. Furthermore, the structure for ZnC 11 was similar to single crystal data for the shorter chain adducts [97]. Based on these results it was concluded that for a homologous series there was a change in structure with chain length.…”

Section: Zinc(ii) Carboxylatessupporting

confidence: 56%

“…The hydrocarbon chains were all crystallized in the fully extended all-trans conformation and were tilted at an average angle of 60°with respect to the zinc basal plane within the lamellar. Interestingly, similar to Mesbah [97], the X-ray data indicated that the hydrocarbon chains for short chain adducts were packed differently from the long chain homologues. For example, a tail-to-tail bilayer arrangement was observed from the butanoate to the octanoate, inclusive, whilst an interdigitated bilayer arrangement was proposed for the longer chain adducts [31].…”

Section: Zinc(ii) Carboxylatesmentioning

confidence: 60%

“…Investigations by Ishioka et al [95,96] involving the use of XAFS and IR spectroscopy, for ZnC 18 and PXRD analysis involving ab initio Rietveld structure solutions, for ZnC 11 , ZnC 12 , and ZnC 14 , by Mesbah et al [97] showed that the structures were arranged in layers with tetrahedral zinc ions, bridged by oxygen atoms of carboxylate groups coordinated in a bidentate mode. The calculations presented by Mesbah [97] were very useful, since proposed structures showed two crystallographically independent chains, for ZnC 11 ; that is, hydrocarbon chains in one of the layers within the lamellar were packed parallel to the zinc plane whilst fully extended and those in the other layer were tilted at an angle of 3.96°to the metal planes. However, for ZnC 12 and ZnC 14 , the chains in the layer were crystallographic equivalent.…”

Section: Zinc(ii) Carboxylatesmentioning

confidence: 99%

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Theories and experimental investigations of the structural and thermotropic mesomorphic phase behaviors of metal carboxylates

Nelson

Taylor

2014

Appl Petrochem Res

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Investigations on the phase behaviors and structural properties of mono-, di-and poly-valent metal carboxylates are reviewed with reference to developments in experimental and theoretical concepts surrounding their liquid crystalline properties. The main methods of structural investigation such as X-ray diffraction, infrared and 13 C-NMR spectroscopies are examined in detail on the basis of common synthetic routes leading to the isolation of pure compounds. A detailed review of the thermal behaviors of several metal carboxylates is presented along with proposed theories and molecular models for odd-even alternation, chain length effects, phase structures and mesophase formation. Theories explaining the effects of metal ion radii and chain unsaturation are also discussed. Proposed degradation mechanisms resulting in the formation of various products and kinetic studies are also considered. Though this review highlights a number of investigations on the structural and phase properties of the mostly widely studied carboxylates, the results presented here strongly indicate that there is room for further studies on some of these systems.

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Section: Zinc(ii) Carboxylatessupporting

confidence: 56%

Section: Zinc(ii) Carboxylatesmentioning

confidence: 60%

Section: Zinc(ii) Carboxylatesmentioning

confidence: 99%

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Theories and experimental investigations of the structural and thermotropic mesomorphic phase behaviors of metal carboxylates

Nelson

Taylor

2014

Appl Petrochem Res

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“…According to Figure 10, the percentage of zinc surface covered with white rust versus the number of climatic cycles reveals that after five cycles the untreated electrogalvanised steel is entirely covered with white rust, formed of Zn-(OH) 2 and Zn 5 (CO 3 ) 2 (OH) 6 , as proved by XRD. The Zn(C 16 ) 2 coating is more resistant, but the best results were observed with the Zn(C 12 ) 2 and ZnC 12 C 16 coatings, which were not very corroded after 20 wet/dry cycles.…”

Section: Coating Synthesis and Characterisationmentioning

confidence: 85%

“…[4] Recently, the crystallographic structures of zinc monocarboxylates Zn(C n ) 2 with short-and mid-length carbon chains were solved on the basis of single-crystal [5] and synchrotron powder diffraction data. [6] All the structures are characterised by a lamellar stacking of polymeric sheets [Zn(C n ) 2 ] x perpendicular to the longest axis (c axis). The sheets are linked by van der Waals interactions and made up of a plane of zinc atoms parallel to (00l).…”

Section: Introductionmentioning

confidence: 99%

Compact Metal–Organic Frameworks for Anti‐Corrosion Applications: New Binary Linear Saturated Carboxylates of Zinc

et al. 2011

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Keywords: Metal-organic frameworks / Zinc / Carboxylate ligands / X-ray diffraction / Surface chemistry Zinc-based metal-organic frameworks (MOFs), binary zinc carboxylates ZnC n C nЈ with C n and C nЈ = CH 3 (CH 2 ) n -2 COO -, have been synthesised and characterised for anti-corrosion applications. The crystallographic structures of ZnC 10 C 14 and ZnC 10 C 16 were determied from synchrotron powder diffraction data and refined by the Rietveld method. Protective coatings on electrogalvanised steel composed of ZnC 12 C 16 have been developed by formulating a particular "carboxylating" bath. The ZnC 12 C 16 coating exhibits better anti-corrosion behaviour than the pure Zn(C 16 ) 2 and Zn(C 12 ) 2 coat-

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Conservation Issues in Several Twentieth-Century Canadian Oil Paintings: The Role of Zinc Carboxylate Reaction Products

Helwig¹,

Poulin²,

Corbeil³

et al. 2014

Issues in Contemporary Oil Paint

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In an on-going study of the materials and techniques of twentieth-century Canadian painters, similar conservation issues in oil paintings by various artists have been noted. These include delamination and lifting paint, zinc soap protrusions and surface efflorescence or accretions. Examples of these phenomena are presented. Delamination in an oil painting from 1956 was found to be related to an underlayer with a high concentration of zinc fatty acid salts (zinc soaps). In two paintings that date from 1936 and 1937, zinc soaps have aggregated and formed protrusions that have broken through the paint surface. The protrusions were analysed using a combination of SEM-EDX, GCMS and FTIR. The FTIR spectra were compared to those of synthetic zinc palmitate, stearate, azelate and oleate. The combined GCMS and FTIR results indicate that the protrusions contain primarily zinc palmitate and stearate. Peak splitting in the FTIR spectrum, which is not observed in synthetic zinc palmitate, stearate or binary palmitate-stearate salts, is likely due to structural distortion. The final example describes a disfiguring surface accretion on a 1952-1954 painting caused by the reaction of zinc with a low molecular weight carboxylic acid (2-hydroxypropanoic or lactic acid).

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Structures of magnesium and zinc long aliphatic chains carboxylates

Cited by 11 publications

References 3 publications

Theories and experimental investigations of the structural and thermotropic mesomorphic phase behaviors of metal carboxylates

Theories and experimental investigations of the structural and thermotropic mesomorphic phase behaviors of metal carboxylates

Compact Metal–Organic Frameworks for Anti‐Corrosion Applications: New Binary Linear Saturated Carboxylates of Zinc

Conservation Issues in Several Twentieth-Century Canadian Oil Paintings: The Role of Zinc Carboxylate Reaction Products

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