Thermodynamics of complex formation of silver with amines in dimethyl sulphoxide

Cassol, A.; Bernardo, Plinio Dí; Zanonato, Pier Luigi; Portanova, Roberto; Tolazzi, Marilena

doi:10.1039/dt9870000657

Cited by 41 publications

(24 citation statements)

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“…[21,24] Dimethyl sulfoxide (Fluka; Ͼ 99%) was purified by distillation according to the described procedures, [46] degassed by a pumping-freezing procedure and stored over 4-Å molecular sieves. The ligands en, dmen, trmen, and tmen (Aldrich; Ͼ 97%) were purified by fractional distillation.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Cobalt(II) Complexes with Nitrogen Donors and Their Dioxygen Affinity in Dimethyl Sulfoxide

Comuzzi

Melchior

Polese

et al. 2002

Eur. J. Inorg. Chem.

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The formation of Co II complexes with differently methylated N-donor ligands ethylenediamine (en), N,NЈ-dimethylethylenediamine (dmen), N,N,NЈ-trimethylethylenediamine (trmen), and N,N,NЈ,NЈ-tetramethylethylenediamine (tmen), has been studied at 298 K in both the aprotic solvent dimethyl sulfoxide (dmso) and in an ionic medium set to 0.1 mol dm −3 with Et 4 NClO 4 under anaerobic conditions. UV/Vis spectrophotometric and calorimetric measurements were carried out to obtain the thermodynamic parameters for the systems investigated. Only mononuclear CoL j 2+ complexes were formed (j = 1−3 for en, j = 1, 2 for dmen; and j = 1 for trmen and tmen) where the diamines act as bidentate agents.

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Section: Methodsmentioning

confidence: 99%

“…[33] The procedure for the calorimetric titration was described before. [46] The heats of dilution of the reactants, determined in separate runs, were found to be negligible. The least-squares computer program Letagrop Kalle [50] was used for the calculation of the enthalpy changes.…”

Section: Methodsmentioning

confidence: 99%

Cobalt(II) Complexes with Nitrogen Donors and Their Dioxygen Affinity in Dimethyl Sulfoxide

Comuzzi

Melchior

Polese

et al. 2002

Eur. J. Inorg. Chem.

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“…On one hand, potentiometrically determined stability constants for 1:1 and 1:2 complexes of Ag + and pyridine in 0.1 mol⋅dm 3 tetraethylammonium perchlorate DMSO solutions 62,63 are rather small i.e. log K 1 = 1.41 63 so that our solutions may in fact contain various amounts of uncomplexed silver ions, and in higher proportion as the dilution increases 64 . On the other hand, silver sulfadiazine has been shown to act as an "undissociable molecule" in complexation studies with DNA.…”

Section: Electrophoretic Dna Migrationmentioning

confidence: 99%

Synthesis, Crystal Structure, Quantum Chemical Calculations, DNA Interactions, and Antimicrobial Activity of [Ag(2-amino-3-methylpyridine)₂]NO₃ and [Ag(pyridine-2-carboxaldoxime)NO₃]

et al. 2010

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[Ag(2-amino-3-methylpyridine)(2)]NO(3) (1) and [Ag(pyridine-2-carboxaldoxime)NO(3)] (2) were prepared from corresponding ligands and AgNO(3) in water/ethanol solutions, and the products were characterized by IR, elemental analysis, NMR, and TGA. The X-ray crystal structures of the two compounds show that the geometry around the silver(I) ion is bent for complex 1 with nitrate as an anion and trigonal planar for complex 2 with nitrate coordinated. ESI-MS results of solutions of 2 indicate the independent existence in solution of the [Ag(pyridine-2-carboxaldoxime)](+) ion. The geometries of the complexes are well described by DFT calculations using the ZORA relativistic approach. The compounds were tested against 14 different clinically isolated and four ATCC standard bacteria and yeasts and also compared with 17 commonly used antibiotics. Both 1 and 2 exhibited considerable activity against S. lutea , M. lutea , and S. aureus and against the yeast Candida albicans , while 2-amino-3-methylpyridine is slightly active and pyridine-2-carboxaldoxime shows no antimicrobial activity. In addition, the interaction of these metal complexes with DNA was investigated. Both 1 and 2 bind to DNA and reduce its electrophoretic mobility with different patterns of migration, while the ligands themselves induce no change.

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“…Ag-ClO 4 also forms stable, four-coordinate, tetrahedral solvates with acetonitrile [4] and dimethylsulfoxide [5,6]. The addition of aliphatic mono-amines to solutions of Ag ' in polar solvents [7,8], however, even for strongly coordinating acetonitrile [9] and dimethylsulfoxide [9,10], results in the formation of quantitatively analysable Ag ' -amine complexes, which have a maximum coordination number of two. In these complexes the arrangement of the silver(I) cation and the two amines is linear, and this may be explained quantumchemically in terms of hybridisations of the 4d z 2-, 5sand 5p z -orbitals of the silver(I) ion [11].…”

Section: Introductionmentioning

confidence: 99%

Stability constants of aza-oxa-crown ether complexes with silver(I) in nonaqueous polar solvents

Thaler

Cox

Schneider

2003

Inorganica Chimica Acta

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Complex formation between the silver(I) ion and monoaza-and diaza-crown ethers has been studied in five polar, nonaqueous solvents using potentiometric techniques. The stability constants are spread over seven orders of magnitude, and the major contributor to this variation is the solvation of the silver(I) cation. The ring-size dependence of the stability constants is determined both by the correspondence of the diameters of the silver(I) ion and the ring-cavity size of the macrocycles, and by specific ligand effects including association complex formation between the ligands and the solvent molecules and conformational effects in the free ligands. In the 1:1 complexes of the silver(I) ion with monoaza-and diaza-crown ethers the dominant interaction is between the silver(I) ion and the ligand's nitrogen atoms, but the ether Á/oxygen atoms also interact with the silver(I) ion. In the AgL 2 ' complexes (L 0/monoaza-crown ether), however, the monoaza-crown ethers coordinate as monodentate ligands, as with simple mono-amine complexants. In these complexes the ethoxy-chains prevent direct interaction between the silver(I) cation and the solvent molecules, with the result that in dipolar aprotic solvents the free energies of transfer of the ligands and the complexes are equivalent, i.e. the socalled cryptate hypothesis holds for the AgL 2 ' complexes.

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Thermodynamics of complex formation of silver with amines in dimethyl sulphoxide

Cited by 41 publications

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Cobalt(II) Complexes with Nitrogen Donors and Their Dioxygen Affinity in Dimethyl Sulfoxide

Cobalt(II) Complexes with Nitrogen Donors and Their Dioxygen Affinity in Dimethyl Sulfoxide

Synthesis, Crystal Structure, Quantum Chemical Calculations, DNA Interactions, and Antimicrobial Activity of [Ag(2-amino-3-methylpyridine)₂]NO₃ and [Ag(pyridine-2-carboxaldoxime)NO₃]

Stability constants of aza-oxa-crown ether complexes with silver(I) in nonaqueous polar solvents

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Thermodynamics of complex formation of silver with amines in dimethyl sulphoxide

Cited by 41 publications

References 0 publications

Cobalt(II) Complexes with Nitrogen Donors and Their Dioxygen Affinity in Dimethyl Sulfoxide

Cobalt(II) Complexes with Nitrogen Donors and Their Dioxygen Affinity in Dimethyl Sulfoxide

Synthesis, Crystal Structure, Quantum Chemical Calculations, DNA Interactions, and Antimicrobial Activity of [Ag(2-amino-3-methylpyridine)2]NO3 and [Ag(pyridine-2-carboxaldoxime)NO3]

Stability constants of aza-oxa-crown ether complexes with silver(I) in nonaqueous polar solvents

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Synthesis, Crystal Structure, Quantum Chemical Calculations, DNA Interactions, and Antimicrobial Activity of [Ag(2-amino-3-methylpyridine)₂]NO₃ and [Ag(pyridine-2-carboxaldoxime)NO₃]