Suchergebnisse

In this study, MgxCu3-xV2O8 (0 ≤ x ≤ 3) and MgyCu2-yV2O7 (0 ≤ y ≤ 2) compositions were synthesized by the chemical coprecipitation method and characterized by X-ray diffraction, UV–vis-NIR spectroscopy and CIE L* a* b* parameters measurements. Melting points of compounds Cu3V2O8 and Cu2V2O7 are 780°C and 790°C, respectively. The addition of small amounts of Mg (II), MgxCu3-xV2O8 (x < 1.0) and MgyCu2-yV2O7 (y < 0.5) fused compositions, was not sufficient to stabilize structures at 800°C. For the Mg2CuV2O8 (x = 2.0) composition fired at 800°C, Mg (II) incorporated into the monoclinic Cu3V2O8 structure stabilizes this crystalline phase. At 1000°C, orthorhombic Mg3V2O8 structure from this composition was obtained. Solid solutions with orthorhombic symmetry were detected from the prepared compositions fired at 1000°C when 1.0 ≤ x ≤ 3.0. The difference of coloration of Cu, Mg vanadates might be explained by the presence of a strong charge transfer band in visible spectra. ; The authors acknowledge the financial support given by the government of Spain, MAT 2008–02893, MAT 2010–15094 and MAT2013-40950-R projects. ; Peer Reviewed

The research leading to these results has received funding from the European Research Council under the European Union's Seventh Framework Programme (FP/2007–2013) / ERC Grant Agreement No.335746, CrystEng-MOF-MMM. S. G.-G. thanks to Ministerio de Economía y Competitividad, MAT2013-40950-R, for financial support.

C14H16N2O6, triclinic, P1̅ (no. 2), a = 10.0254(5) Å, b = 11.2726(6) Å, c = 13.4494(7) Å, α = 111.535(2)°, β = 92.068(2)°, γ = 102.644(2)°, V = 1368.16(13) Å3, Z = 4, Rgt(F) = 0.047, wRref(F2) = 0.133, T = 150 K. ; The research leading to these results has received funding from the European Research Council under the European Union's Seventh Framework Programme (FP/2007–2013) / ERC Grant Agreement No.335746, CrystEngMOF-MMM. S. G.-G. thanks to Ministerio de Economía y Competitividad, MAT2013-40950-R, for financial support. ; Peer Reviewed

A straightforward and robust modular synthetic approach was developed for the asymmetric synthesis of imidazolium salts, in which several engineered molecular vectors were considered to evaluate their toxicological profile. The diastereoselective synthesis of cis-3-(1H-imidazol-1-yl)cyclohexanol was achieved by the Michael addition of imidazole to cyclohex-2-en-1-one under microwave conditions followed by reduction of the ketone. The racemic cis-alcohol obtained was successfully resolved through a lipase-catalysed kinetic resolution, Pseudomonas cepacia lipase proved to be a good biocatalyst for the exclusive acetylation of the (1R,3S)-cis enantiomer. Using the remaining (1S,3R)-cis alcohol enantiomer as a synthetic precursor, the optically active (1R,3R)-trans alcohol enantiomer was also prepared. The corresponding chiral salts and ionic liquids were obtained via quaternisation with alkyl halides, followed by anion exchange with inorganic salts. In this manner, a family of novel imidazolium-based ionic liquids was prepared, and their properties as phase-transfer catalysts in the Michael addition of diethyl malonate to trans-chalcone were analysed. The toxicity of these compounds against E. coli cells was also evaluated to understand their structural implications through the presented systematic synthetic approach. ; This project was supported by the BIOTRAINS Marie Curie Initial Training Network, financed by the European Union through the 7th Framework People Programme (grant agreement number 238531). Financial support from the Spanish MICINN (Projects CTQ-2007-61126, MAT-2006-01997 and MAT-2010-15094) is also gratefully acknowledged. V. G. -F. and I. L. acknowledge MICINN for their research contracts under the Ramo´n y Cajal Program

This project is supported by the BIOTRAINS Marie Curie Initial Training Network, financed by the European Union through the 7th Framework People Programme (grant agreement number 238531). Financial support from the Spanish Ministerio de Ciencia e Innovación (MICINN-12-CTQ2011-24237), Ministerio de Economía y Competitividad (MAT2010-15094, Factoría de Cristalización—Consolider Ingenio 2010), ERDF and the Principado de Asturias (SV-PA-13-ECOEMP-42 and SV-PA-13-ECOEMP-43) is also gratefully acknowledged. F.R.B. acknowledges INFIQC-CONICET and Universidad Nacional de Córdoba. I.L. acknowledges MICINN for his research contract under the Ramón y Cajal Program

We acknowledge fnancial support form Spanish MINECO/FEDER, Grants CTQ2015-65790-P and CTQ2016- 76829-R and Principado de Asturias Government Grant FC-GRUPINIDI/2018/000117. C. C. expresses her gratitude to MINECO for the award of "Ramón y Cajal" contract (RYC-2014-16021). AFA thanks CONACyT/México for his scholarship 436154. We also thank Dr. P. Braña for fruitful discussions.