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Abstract

The surface area of kaolinite-benzamide (K-Bz) 6.62 m2 g−1, which is noticeably lower than that of kaolinite-dimethyl sulphoxide (K-DMSO) 14.61 m2 g−1, the co-perturbation of the inner-surface hydroxyl features at 3697 and 3650 cm−1, and the increase of d(001) value by 7.44 Å are all related to the benzamide species inserted into the kaolinite structure through the replacement of the K-DMSO composites. Disappearance of the DMSO reflections and emergence of well-defined features at 6.04(2θ) and 11.16(2θ), 001 and 002 reflections with d values of 14.62 and 7.92 Å, respectively point out that the DMSO species were substituted efficiently by benzamide molecules. The thermal stability of the K-Bz derivative up to 300°C can be attributed to the slightly tilted aromatic ring keying into the gibbsitic sheets via the –NH2 groups.

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Acta Veterinaria Hungarica
Authors: Béla Gyetvai, Ákos Jerzsele, Erzsébet Pászti-Gere, Gábor Nagy, and Péter Gálfi

Da Violante, G., Zerrouk, N., Richard, I., Provot, G., Chaumeil, J. C. and Arnaud, P. (2002): Evaluation of the cytotoxicity effect of dimethyl sulfoxide (DMSO) on Caco2/TC7 colon tumor cell cultures. Biol. Pharm. Bull. 25 , 1600

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dissolved in dimethyl sulfoxide (DMSO) were studied at different amount by a RD496-2000 calorimeter at 298.15 K. In addition, the kinetic formula and the half-life were calculated. This will be useful to provide a potential reference for the clinical

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previously reported [ 10 , 11 ]. In this article, we report the results of study of the complex formation in the organic solvent dimethylsulfoxide (DMSO) between Cd(II) ion and the tripodal ligands shown in Scheme 1 : 2,2′,2″-triaminoethylamine

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Abstract  

Polymorphism and thermal decomposition of [Mg(DMSO)6](NO3)2, where DMSO =(CH3)2SO, were studied by differential scanning calorimetry (DSC) and thermogravimetry (TG). The gaseous products of the decomposition were on-line identified by a quadruple mass spectrometer (QMS). Three phase transitions have been detected for this compound in the temperature range of 95–370 K between the following solid phases: stable KIb↔stable KIa at T C3=195 K, metastable KII↔supercooled K0 at T C2=230 K and stable KIa→stable K0 at T C1=337 K. Thermal decomposition of the title compound proceeds in three main stages. In the first stage, which starts just above ca. 380 K, and is continued up to ca. 540 K, the compound loses in two steps four DMSO molecules per one formula unit and undergoes into [Mg(DMSO)2](NO3)2. The second stage starts just immediately after liberating four DMSO ligands and is connected with the decomposition of [Mg(DMSO)2](NO3)2 and the formation of a mixture of solid anhydrous magnesium sulfate, magnesium nitrate and magnesium oxide and also a mixture of gaseous products of the DMSO and Mg(NO3)2 decomposition. The third and the last stage corresponds to the decomposition of not decomposed yet magnesium nitrate and formation of magnesium oxide, nitrogen oxides and oxygen.

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Journal of Thermal Analysis and Calorimetry
Authors: Anna Migdał-Mikuli, Elżbieta Szostak, K. Drużbicki, and Diana Dołȩga

Abstract  

Tetrakis(dimethyl sulphoxide)nickel(II) bis(iodide) was studied by thermogravimetry (TG) and simultaneous differential thermal analysis (SDTA) and differential scanning calorimetry (DSC). The gaseous products of the decomposition were on-line identified by a quadrupole mass spectrometer (QMS). Thermal decomposition of the title compound proceeds in three main stages. In the first stage, which starts just above ca. 419 K, the compound loses two dimethyl sulphoxide (DMSO) molecules per one formula unit and small amount of iodide ion. In the second stage (464–552 K) the next DMSO ligands and the iodide ion simultaneously are released. In the last stage (552–900 K) NiSO4 is created which next decomposes to NiO and SO3.

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Journal of Thermal Analysis and Calorimetry
Authors: Mihaela Badea, Rodica Olar, Dana Marinescu, Valentina Uivarosi, Teodor Nicolescu, and Daniela Iacob

Abstract  

A series of new complexes with mixed ligands of the type RuLm(DMSO)nCl3·xH2O ((1) L: oxolinic acid (oxo), m = 1, n = 0, x = 4; (2) L: pipemidic acid (pip), m = 2, n = 1, x = 2; (3) L: enoxacin (enx), m = 2, n = 1, x = 0; (4) L: levofloxacin (levofx), m = 2, n = 2, x = 8; DMSO: dimethylsulfoxide) were synthesized and characterized by chemical analysis, IR and electronic data. Except oxolinic acid that behaves as bidentate, the other ligands (quinolone derivatives and DMSO) act as unidentate. Electronic spectra are in accordance with an octahedral stereochemistry. The thermal analysis (TG, DTA) in synthetic air flow elucidated the composition and also the number and nature of both water and DMSO molecules. The TG curves show 3–5 well-separated thermal steps. The first corresponds to the water and/or DMSO loss at lower temperatures followed either by quinolone thermal decomposition or pyrolisys at higher temperatures. The final product is ruthenium(IV) oxide.

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The thermal behaviours of five new hexakis-DMSO-Cr(III) compounds were investigated by means of the Derivatograph. The composition of these complexes are discussed.

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Abstract  

Phase transition and thermal decomposition of hexadimethylsulfoxidealuminium chloride were studied by differential scanning calorimetry (DSC), thermogravimetry (TG) and simultaneous differential thermal analysis (SDTA). The gaseous products of the decomposition were on-line identified by a quadrupole mass spectrometer (QMS). In the temperature range of 95–300 K, [Al(DMSO)6]Cl3 indicates one phase transition at T c h=244.96 K (on heating) and at T c c=220.87 K (on cooling). Large thermal hysteresis of the phase transition (∼24 K) indicates its first order character. Large value of transition entropy (ΔS≈40 J mol−1 K−1) suggests its configurational character. Thermal decomposition of the title compound proceeds in four main stages. In the first stage, which starts just above ca. 300 K, the compound loses two DMSO molecules per one formula unit and undergoes into [Al(DMSO)4]Cl3. In the second stage, the next three DMSO ligands are released and simultaneously decomposed. The third stage, which continues up to ca. 552 K, is connected with a loss of the last DMSO ligand and the formation of AlCl3. In the fourth stage AlCl3 reacts with carbon monoxide that originates from the decomposition of DMSO, and first aluminium oxychloride and next solid Al2O3 plus carbon are created.

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Abstract  

The distribution ratios for the extraction of Zr(IV) by TBP and its binary mixtures with DMSO or Py in n-dodecane in the presence of HNO3, and HClO4 have been determined. Based on stoichiometric and slope analysis methods a possible mechanism for the extraction has been proposed.

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