Magnetic, thermal and spectral characterization of 2,6-dimethoxybenzoates of Co(II), Ni(II) and Cu(II)

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

doi:10.1590/s0100-46702006000200003

Cited by 5 publications

(8 citation statements)

References 22 publications

(27 reference statements)

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“…The complexes of the 2,3-, 3,5-and 2,6-dimethoxybenzoates of Ni(II) were obtained as polycrystalline green solids with a metal to ligand ratio of 1:2 and the general formula Ni(C 9 H 9 O 4 ) 2 ⋅nH 2 O, where n=1 for 2,3-dimethoxybenzoate, n=3 for 3,5-dimethoxybenzoate and n=4 for 2,6-dimethoxybenzoate [8][9][10][11][12]. The details connected with their identification by elemental and spectral analyses were extensively presented in our pervious papers [8][9][10][11][12].…”

Section: Resultsmentioning

confidence: 99%

“…The details connected with their identification by elemental and spectral analyses were extensively presented in our pervious papers [8][9][10][11][12]. Therefore, in this article only some selected results of the FTIR investigations were presented in Table 1.…”

Section: Resultsmentioning

confidence: 99%

“…The complexes show paramagnetic properties and they obey the Curie-Weiss law. The values of the Weiss constant, Θ, for all the complexes were found to be negative, which probably arises from a crystal field splitting of the paramagnetic spin state [9][10][11][12][29][30][31][32]. The paramagnetic dependences of values of the magnetic susceptibility as a function of temperatures are given in Table 3.…”

Section: Table 4 Magnetic Moment Values Of the Complexes With The Cementioning

confidence: 99%

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

et al. 2006

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×dm-3. The magnetic susceptibilities for the analysed dimethoxybenzoates of Ni(II) were measured over the range of 76-303 K and the magnetic moments were calculated. The results reveal that the complexes are the high-spin ones and the ligands form the weak electrostatic field in the octahedral coordination sphere of the central Ni(II) ion. The various position -OCH3 groups in benzene ring cause the different steric, mesomeric and inductive effects on the electron density in benzene ring.]]>

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Table 4 Magnetic Moment Values Of the Complexes With The Cementioning

confidence: 99%

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

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“…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.…”

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

Dziewulska-Kułaczkowska

Ferenc

2009

Eclet. Quim.

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

Dziewulska-KuBaczkowska

Ferenc

2009

Eclet. Quím.

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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 characterization of 2,6-dimethoxybenzoates of Co(II), Ni(II) and Cu(II)

Cited by 5 publications

References 22 publications

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

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

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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