Magnetic, thermal and spectral properties of Ni(II) 2,3- , 3,5- and 2,6-dimethoxybenzoates

Ferenc, W.; Walków-Dziewulska, Agnieszka; Sarzyński, Jan; Paszkowska, Barbara

doi:10.1590/s0100-46702006000300007

“…The UV spectra of valsartan and its metal complexes are shown in Figure S8-S11. The magnetic moment of the Ni complex was approximately 2.5 B.M, which indicates a high-spin sp 3 d 2 -octahedral complex [47]. The molar conductivity measurements confirmed that the synthesized The elemental compositions of the metal complexes were analyzed using energy dispersive X-ray (EDX), which confirmed the types of elements that each complex contained.…”

Section: Synthesis Of Metal Complexesmentioning

confidence: 70%

Synthesis and Use of Valsartan Metal Complexes as Media for Carbon Dioxide Storage

Mohammed

¹

,

Yousif

²

,

El‐Hiti

³

2020

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To address global warming through carbon dioxide storage, three valsartan metal complexes were synthesized in excellent yields (87–92%) through a reaction of the appropriate metal chloride (tin chloride, nickel chloride hexahydrate, or magnesium chloride hexahydrate) and excess valsartan (two mole equivalents) in boiling methanol for 3 h. The structures of the metal complexes were established based on the data obtained from ultraviolet-visible, Fourier transform infrared, and proton nuclear magnetic resonance spectra, as well as from elemental analysis, energy-dispersive X-ray spectra, and magnetic susceptibility. The agglomeration and shape of the particles were determined using field emission scanning electron microscopy analysis. The surface area (16.63–22.75 m2/g) of the metal complexes was measured using the Brunauer-Emmett-Teller method, whereas the Barrett-Joyner-Halenda method was used to determine the particle pore size (0.011–0.108 cm3/g), total average pore volume (6.50–12.46 nm), and pore diameter (6.50–12.47 nm), for the metal complexes. The carbon dioxide uptake of the synthesized complexes, at 323 K and 4 MPa (40 bar), ranged from 24.11 to 34.51 cm2/g, and the nickel complex was found to be the most effective sorbent for carbon dioxide storage.

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“…Probably it is connected with the different participations of the inductive and mesomeric effects of methoxygroups in the electron density of the system. In our previously published papers [6,8,[10][11][12] it was said that the complexes of 3,5-dimethoxybenzoates with Co(II), Ni(II) and Cu(II) were more thermally stable than those of the remaining isomers. The hydrates of 3,5-dimethoxybenzoates of Co(II), Ni(II) and Cu(II) losing water molecules in one step form the anhydrous compounds that next are decomposed at higher temperatures than dimethoxy-and trimethoxybenzoates of those elements.…”

Section: Thermal Analysismentioning

confidence: 99%

“…In our earlier papers the synthesis of complexes of Co(II), Ni(II) and Cu(II) with various isomers of di-and trimethoxybenzoic acid anions was described and the investigation of their properties was presented [3][4][5][6][7][8][9][10][11][12]. Now we decided to present the preparation of di-and trimethoxybenzoates of Ag(I) in the solid state, and the examination of their properties such as: thermal stability in air, solubility in water, the ways of coordination of carboxylate groups and their crystalline form.…”

mentioning

confidence: 99%

Thermal and spectral properties of di- and trimethoxybenzoates of silver (I)

Dziewulska-Kułaczkowska

¹

,

Ferenc

²

2009

Eclet. Quim.

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0

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The complexes of silver(I) with 2,3-, 2,4-, 2,6-, 3,4-, 3,5-dimethoxy-, and 2,3,4- and 3,4,5-trimethoxybenzoic acid anions have been synthesized and characterized by elemental analysis, IR spectroscopy, thermogravimetric and X-ray studies. Their solubility in water has been also determined at 293K. All analysed complexes were found to be crystalline, anhydrous compounds with low symmetry. The carboxylate groups act as bidentate or monodentate ligands. The thermal stability of compounds has been examined in air in temperature range of 293-1173K. The analysed complexes were found to be stable at room temperature and their solubilities in water at 293K to be in the order of 10-4 mol.dm-3.

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“…Probably it is connected with the different participations of the inductive and mesomeric effects of methoxygroups in the electron density of the system. In our previously published papers [6,8,[10][11][12] it was said that the complexes of 3,5-dimethoxybenzoates with Co(II), Ni(II) and Cu(II) were more thermally stable than those of the remaining isomers. The hydrates of 3,5-dimethoxybenzoates of Co(II), Ni(II) and Cu(II) losing water molecules in one step form the anhydrous compounds that next are decomposed at higher temperatures than dimethoxy-and trimethoxybenzoates of those elements.…”

Section: Thermal Analysismentioning

confidence: 99%

“…In our earlier papers the synthesis of complexes of Co(II), Ni(II) and Cu(II) with various isomers of di-and trimethoxybenzoic acid anions was described and the investigation of their properties was presented [3][4][5][6][7][8][9][10][11][12]. Now we decided to present the preparation of di-and trimethoxybenzoates of Ag(I) in the solid state, and the examination of their properties such as: thermal stability in air, solubility in water, the ways of coordination of carboxylate groups and their crystalline form.…”

mentioning

confidence: 99%

Thermal and spectral properties of di-and trimethoxybenzoates of silver (I)

Dziewulska-KuBaczkowska

¹

,

Ferenc

²

2009

Eclet. Quím.

0

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Introduction The carboxylates of many cations play an important role in inorganic and bioinorganic chemistry and in a great number of various biological processes they are component of several vitamins and drugs [1, 2]. 2,3-, 2,4-, 2,6-, 3,4-, 3,5-Dimethoxy-and 2,3,4-and 3,4,5-trimethoxybenzoic acids are crystalline solids sparingly soluble in water. Their anions have the following formulae: 63 Abstract: The complexes of silver(I) with 2,3-, 2,4-, 2,6-, 3,4-, 3,5-dimethoxy-, and 2,3,4-and 3,4,5-trimethoxybenzoic acid anions have been synthesized and characterized by elemental analysis, IR spec-troscopy, thermogravimetric and X-ray studies. Their solubility in water has been also determined at 293K. All analysed complexes were found to be crystalline, anhydrous compounds with low symmetry. The carboxylate groups act as bidentate or monodentate ligands. The thermal stability of compounds has been examined in air in temperature range of 293-1173K. The analysed complexes were found to be stable at room temperature and their solubilities in water at 293K to be in the order of 10-4 mol.dm-3. In the presented acid molecules there are two kinds of substituents:-COOH and-OCH 3. The first one, as an electron acceptor decreases the electronic density of benzene ring molecule while-OCH 3 as being its donor decreases the acidity of benzoic acid derivatives.These distinct characters of above presented two kinds of substituents influence the properties of methoxybenzoic acid iso-mers and their compounds. Moreover the mesomeric, inductive and steric effects are known to affect the properties of aliphatic and aromatic compounds. The inductive effects of each methoxy-group causing the delocalization of the electrons in the complex molecule change its energy state and bring about the conjugation of electrons. Furthermore the mesomeric effects caused by those groups rise the energetic changes in the molecule of the organic compound. The inductive effect created by those sub-stituents influences mainly the electron density in benzene ring in their meta-position, while in

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Magnetic, thermal and spectral properties of Ni(II) 2,3- , 3,5- and 2,6-dimethoxybenzoates

Cited by 5 publications

References 22 publications

Synthesis and Use of Valsartan Metal Complexes as Media for Carbon Dioxide Storage

Synthesis and Use of Valsartan Metal Complexes as Media for Carbon Dioxide Storage

Thermal and spectral properties of di- and trimethoxybenzoates of silver (I)

Thermal and spectral properties of di-and trimethoxybenzoates of silver (I)

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