Nicolas Ratel-Ramond

Synthesis, Characterization and Antibacterial Activity of a Novel Photoluminescent Nb-Substituted Lindqvist Polyoxotungstate Based Organic Cation

A novel heteropolyoxometalate, Nb-substituted hexatungstate compound; (C9H8N)3[NbW5O19]·3H2O triquinolinium μ6-oxido-dodeca-μ2-oxidohexaoxido[niobium(V)pentatungsten(VI)]ate trihydrate (QNbW5) has been grown by slow evaporation method and characterized by powder X-ray and single-crystal XRD methods, NMR, IR, UV–Vis and photoluminescence spectroscopy measurements, elemental analysis and thermogravimetric analysis. Single-crystal XRD analyses show that QNbW5 crystallizes in the triclinic space group

Structure of the calcium pyrophosphate monohydrate phase (Ca2P2O7·H2O): towards understanding the dehydration process in calcium pyrophosphate hydrates.

{\text{P}}\overline{ 1}

Bis(2-methoxybenzylammonium) diaquabis(dihydrogen diphosphato-κ2O,O′)cobaltate(II) dihydrate

P1¯ and its crystal structure consists of 3D grid-like network of components in a close connection through N–H···O, C–H···O and offset π···π stacking interactions between neighboring rings of quinolinium moieties. Moreover, the spectroscopic and electronic properties of QNbW5 have also been investigated showing a considerable important gap energy well confirming the semiconductor behavior and the blue photoluminescent property of reported material. In addition, the complex shows promising antimicrobial activity against four pathogenic microbes in comparison with its components alone.

Simple and economic elaboration of high purity CaCO3 particles for bone graft applications using a spray pyrolysis technique

Five tris(β-diketonato) complexes of ruthenium(III), chromium(III), and cobalt(III) [Ru(Buacac)3 (1), Ru(Oacac)3 (2), Cr(Buacac)3 (3), Cr(Oacac)3 (4), and Co(Buacac)3 (5), where Buacac = 3-butylpentane-2,4-dionato and Oacac = 3-octylpentane-2,4-dionato] with a chiral propeller-like structure have been prepared. Ligands and complexes syntheses are presented together with characterization of the compounds by 1H and 13C NMR spectroscopy, mass spectrometry, IR, UV-vis, electronic circular dichroism (ECD) spectroscopy, electrochemistry studies, and first-principles calculations. The crystal structures of 1 and 5 have also been obtained and analyzed. A comparison of the 1H NMR spectra of diamagnetic (ligands and 5) and paramagnetic (1 and 2) species is presented. Optical resolution of the five complexes has been achieved for the first time by supercritical fluid chromatography using a chiral column, giving rise to very high purity grades in all cases. ECD measurements and calculations have led to the assignment of the absolute configuration, Δ or Λ, of each enantiomer for 1-5. Spectroelectrochemical UV-vis and ECD studies have been performed on ruthenium Λ-2 and chromium Λ-4 complexes, revealing their redox-triggered chiroptical switching confirming the noninnocence character of the β-diketonate ligands.

A New Photoluminescent Co(II)-Diphosphate Cluster Templated by Fampridine Cation: Synthesis and Biophysicochemical Evaluation

Calcium pyrophosphate hydrate (CPP, Ca(2)P(2)O(7) · nH2O) and calcium orthophosphate compounds (including apatite, octacalcium phosphate etc.) are among the most prevalent pathological calcifications in joints. Even though only two dihydrated forms of CPP (CPPD) have been detected in vivo (monoclinic and triclinic CPPD), investigations of other hydrated forms such as tetrahydrated or amorphous CPP are relevant to a further understanding of the physicochemistry of those phases of biological interest. The synthesis of single crystals of calcium pyrophosphate monohydrate (CPPM; Ca(2)P(2)O(7) · H2O) by diffusion in silica gel at ambient temperature and the structural analysis of this phase are reported in this paper. Complementarily, data from synchrotron X-ray diffraction on a CPPM powder sample have been fitted to the crystal parameters. Finally, the relationship between the resolved structure for the CPPM phase and the structure of the tetrahydrated calcium pyrophosphate β phase (CPPT-β) is discussed.

Crystal structure of 3-ethynyl­benzoic acid

Decavanadate cluster templated with organic cation, [4-(CH3O)C6H4CH2NH3]6V10O28·2H2O (4MBAV10) has been prepared and characterized by elemental analysis, X-ray diffraction and IR., UV–Vis., fluorescence and 1H, 13C-NMR spectroscopies. The X-ray structure determination revealed the discrete decavanadate cage-like clusters [V10O28]6− (V10). These polymeric species associated to lattice water results into inorganic 2D-framework

Synthesis, crystal structure, vibrational properties and dielectric properties of 1-(2-ammonium-ethyl) pipérazindiium hexachlorobismuthate(III)

\left[ {{\text{V}}_{ 10} {\text{O}}_{ 2 8} \left( {{\text{H}}_{ 2} {\text{O}}} \right)_{ 4} } \right]_{\text{n}}^{6 - }