Temperature-dependent Fourier transform infrared and differential scanning calorimetry studies of zinc carboxylates

Berkesi, Ottó; Katona, Tamás János; Dreveni, I.; Andor, J.A.; Mink, J.

doi:10.1016/0924-2031(94)00059-p

Cited by 17 publications

(15 citation statements)

References 30 publications

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“…This trend probably reflects the lower boiling point of butyric acid and presumably reduced accessibility to the catalyst in the presence of the long and flexible chains, admitting that also, in these cases, the effective catalysts are the corresponding zinc(II) carboxylates produced in situ . In fact, the FT-IR spectra of the recovered catalyst were in accordance with literature − data (Figure S4).…”

Section: Resultssupporting

confidence: 87%

Homogeneous Catalysis and Heterogeneous Recycling: A Simple Zn(II) Catalyst for Green Fatty Acid Esterification

Melchiorre¹,

Cucciolito

Serio

et al. 2021

ACS Sustainable Chem. Eng.

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This work describes the use of simple zinc(II) salts (ZnCl 2 , ZnCO 3 , Zn(OAc) 2 , ZnO, Zn(ClO 4 ) 2 , Zn(TfO) 2 , and Zn(BF 4 ) 2 ) as effective catalysts for the esterification of fatty acids with long-chain alcohols and simple polyols through a homogeneous system that allows the gradual and selective removal of water. The results show that the catalytic activity depends on the nature of the counterion: the most effective are the salts with poorly coordinating anions (perchlorate and triflate) or containing basic Brønsted anions (oxide, acetate, and carbonate). However, only with the latter is it possible to fully recover the catalyst at the end of each run, which is easily filtered in the form of zinc carboxylate, given its insolubility in the ester produced. In this way, it is possible to recycle the catalyst numerous times, without any loss of activity. This beneficial prerogative couples the efficiency of the homogeneous catalysis with the advantage of the heterogeneous catalysis. The process is, therefore, truly sustainable, given its high efficiency, low energy consumption, ease of purification, and the absence of auxiliary substances and byproducts.

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Section: Resultssupporting

confidence: 87%

Homogeneous Catalysis and Heterogeneous Recycling: A Simple Zn(II) Catalyst for Green Fatty Acid Esterification

Melchiorre¹,

Cucciolito

Serio

et al. 2021

ACS Sustainable Chem. Eng.

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“…Zinc(II) carboxylates have been synthesized in various polymorphic forms [20,61,62,[86][87][88], by a number of authors including Taylor [31]. Unfortunately some of these studies featured zinc(II) n-alkanoates synthesized in low purities and yields [20,89,90]; hence, discrepancies in the proposals for their structures and mesomorphic properties were evident.…”

Section: Zinc(ii) Carboxylatesmentioning

confidence: 99%

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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“…This effect seems to be responsible for the catalytic behavior in homogeneous medium during esterification/transesterifications reactions and recovery of the catalysts after the structure is rebuild after cooling [6,7]. Berkesi et al also reported that the symmetric and asymmetric stretching modes of the carboxylate groups become narrower by increasing the temperature [10], corroborating Mesubi's work [9]. However, the use of infrared/raman spectroscopy can be misleading in terms of the coordination type [13].…”

Section: Introductionmentioning

confidence: 77%

A theoretical study of a homologous series of zinc n-alkanoates (2 ≤ n ≤ 8): Structural analysis, evaluation of their interactions and monofilm formation

Tavares

Leitão

2015

Chemical Physics Letters

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a b s t r a c tA series of homologous zinc carboxylates were studied by means of DFT calculations in order to elucidate some interactions in their structures. Geometry optimizations were conducted with two different exchange-correlation functionals (PBE and vdW-DF) and an exchange-correlation approach (DFT-D2) to verify which method could better describe the compounds. Their corresponding monofilms were also studied and post-processing calculations (Bader charge analysis and PDOS) showed that the weak Van der Waals forces affect neither the coordination nor the zinc acidity. This means that the differences observed by experiments are majorly influenced by the conformational disorder of the carbon chains.

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Temperature-dependent Fourier transform infrared and differential scanning calorimetry studies of zinc carboxylates

Cited by 17 publications

References 30 publications

Homogeneous Catalysis and Heterogeneous Recycling: A Simple Zn(II) Catalyst for Green Fatty Acid Esterification

Homogeneous Catalysis and Heterogeneous Recycling: A Simple Zn(II) Catalyst for Green Fatty Acid Esterification

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

A theoretical study of a homologous series of zinc n-alkanoates (2 ≤ n ≤ 8): Structural analysis, evaluation of their interactions and monofilm formation

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