Thermal properties of lanthanide(III) complexes with 5-amino-1,3-benzenedicarboxylic acid

Rzączyńska, Z.; Woźniak, Michał; Wołodkiewicz, W.; Ostasz, A.; Pikus, S.

doi:10.1007/s10973-005-7463-4

Cited by 9 publications

(5 citation statements)

References 16 publications

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“…The anhydrous compound is stable up to 693 K. When the complex is heated above 713 K, the subsequent decomposition of the compound with degradation of organic ligand takes place. The first step of organic ligand decomposition is release of CO 2 which is reflected in the FTIR spectra recorded at 713 K. Carbon dioxide molecules absorb in the wave number in the ranges 2300-2250 cm -1 and 750-600 cm -1 due to deformation and valence vibrations [37]. With the increasing temperature, the molecules of CO are released and their characteristic absorption bands occur in the range 2220-2060 cm -1 [38,39].…”

Section: Tg-ftir Analysismentioning

confidence: 99%

Synthesis, spectroscopic and thermal studies of 2,3-naphthalenedicarboxylates of rare earth elements

Rzączyńska

Kula

Sienkiewicz-Gromiuk

et al. 2010

J Therm Anal Calorim

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The complexes of rare earth elements with 2,3-naphthalenedicarboxylic acid of the formula: Ln 2 (C 12 H 6 O 4 ) 3 ÁnH 2 O, where Ln = La(III)-Lu(III) and Y(III); n = 3 for La(III), Ce(III); n = 6 for Pr(III)-Yb(III) and Y(III) and n = 5 for Lu(III) have been synthesized and characterized by elemental analysis, IR spectroscopy, thermal analysis (TG, DTG, DTA and TG-FTIR) and X-ray analysis. They are sparingly soluble in water and stable at room temperature. During heating in air atmosphere, they lose all water molecules in several steps, generally in two or three steps, except for the La(III) and Ce(III) complexes which lose all water molecules in one step. The anhydrous compounds are stable up to about 773 K and then decompose to corresponding oxides. The thermal decomposition is connected with the release of water molecules (443 K), carbon dioxide (713 K) and hydrocarbons.

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Section: Tg-ftir Analysismentioning

confidence: 99%

Synthesis, spectroscopic and thermal studies of 2,3-naphthalenedicarboxylates of rare earth elements

Rzączyńska

Kula

Sienkiewicz-Gromiuk

et al. 2010

J Therm Anal Calorim

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“…In addition, the electron density distribution indicates the presence of an electronic repulsion due to the polarization effected of the Tb +3 ion obtaining a geometry of the Fc fragment of the flat-on type [25,53] . On the other hand, the carbonyl groups form bonds with the Tb +3 due to the transfer of electrons to the amino groups attributed to the delocalized electrons [54,55] . Furthermore, pH control at 7 is carried out because at acid levels the aminoacid chain are protonated, that is, an electrostatic repulsion is generated, thus producing the denaturation of Fc [56] .…”

Section: Resultsmentioning

confidence: 99%

Adsorption of terbium ion on Fc/dymethylacrylamide: application of Monte Carlo simulation

Vázquez

2020

Polímeros

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The crosslinking of the Fc fragment (IgG antibody) on a polymer matrix about of dimethylacrylamide (DMA), melamide group (MG) and n-acryloxy succinimide (NAS) was analyzed through Monte Carlo simulation at 277.15K and pH 7, in where Gibs free energy and the dipole moment indicated the spontaneity of the reaction through van der Waals interactions. In addition, the QSAR properties determinated that both the surface area and the volume allow to carry out the physical adsorption of the Fc fragment that was verified through the electronic distribution of the electrostatic potential maps (MESP) where the nucleophilic zones (blue color) and electrophilic (red color) were observed, while the partition coefficient (Log P) indicated the solubility of the process. Subsequently, the analysis of the adsorption of the terbium ion (Tb +3 ) at 277.15K and a pH 7 in Fc/polymeric matrix was carried out, observing that the Fc fragment presented a flat-on optimization geometry attributed to the Tb +3 that generates electronic repulsions, as well as van der Waals forces, hydrogen bonds derived from the Cys aminoacids formed a polar structure and that was corroborated by the Log P negative. Finally, the surface area and volume determined that Tb +3 adsorption showed an increase in surface area and volume with temperature.

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“…These results indicate that the major factor contributing to the observed rate of reaction is off-cycle binding of the dysprosium catalyst as a complex such as 12 (Scheme ) and, further, that the binding equilibrium between free dysprosium, aniline binding, or furylcarbinol binding lies very far in favor of amine complex 12 . While we were not able to isolate an authentic species such as 12 , several stable aniline-dysprosium species have been reported and characterized . In addition, the observed zero-order reaction profile for this rearrangement is similar to a proline-catalyzed system where off-cycle catalyst binding restricts the available catalyst pool …”

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confidence: 89%

Importance of Off-Cycle Species in the Acid-Catalyzed Aza-Piancatelli Rearrangement

Thai

Palmer

et al. 2013

J. Org. Chem.

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The observed rate of reaction in the dysprosium triflate catalyzed aza-Piancatelli rearrangement is controlled by a key off-cycle binding between aniline and catalyst. Deconvoluting the role of these ancillary species greatly broadens our understanding of factors affecting the productive catalytic pathway. We demonstrate that the rate of reaction is controlled by initial competitive binding between the furylcarbinol and nitrogen nucleophile using either a Brønsted or Lewis acid catalyst and that the resulting rearrangement proceeds without involving the Brønsted and Lewis acid catalyst. This shows conclusively that the rate-controlling step and selectivity of reaction are decoupled.

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Thermal properties of lanthanide(III) complexes with 5-amino-1,3-benzenedicarboxylic acid

Cited by 9 publications

References 16 publications

Synthesis, spectroscopic and thermal studies of 2,3-naphthalenedicarboxylates of rare earth elements

Synthesis, spectroscopic and thermal studies of 2,3-naphthalenedicarboxylates of rare earth elements

Adsorption of terbium ion on Fc/dymethylacrylamide: application of Monte Carlo simulation

Importance of Off-Cycle Species in the Acid-Catalyzed Aza-Piancatelli Rearrangement

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