trans-Dichlorido(1,4,8,11-tetra­azacyclo­tetra­deca­ne)manganese(III) tetra­fluorido­borate

In the title manganese(III) complex, [MnCl2(C10H24N4)]BF4 or trans-[MnCl2(cyclam)]BF4 (cyclam is the tetra­dentate amine ligand 1,4,8,11-tetra­azacyclo­tetra­deca­ne), the MnIII ions occupy the center of a distorted octa­hedron coordinated by all four ligand nitro­gen donors in the macrobicyclic cavity and two chloride ions occupy the axial positions. Intra­molecular hydrogen bonding involving the coordinated chloride ions and the hydrogen atoms of the cyclam ligand is observed. Inter­molecular hydrogen bonding involving the tetrafluoridoborate anion and hydrogen atoms of the cyclam ligand leads to an infinite one-dimensional chain along the a axis. The tetra­fluoridoborate and inorganic units are linked by N—H⋯F hydrogen bonds. The structure may be compared with those of analogous compounds [MnCl2(cyclam)]ClO4 and [Mn(CN)2(cyclam)]ClO4

Synthesis, Structural, Thermal and Luminescence Studies of new DABCO ¬bismuthate (III) hybrid material

The title compound Bis(1,4-diazabicyclo[2.2.2]octane)octachlorido-di-bismuthate (III) dihydrate was obtained by slow evaporation at room temperature of a hydrochloric aqueous solution (pH=1) containing bismuth (III) nitrate and the 1,4-diazabicyclo[2.2.2]octane (DABCO) in a 1:2 molar ratio. This material crystallizes in the P21/c monoclinic space group with a=7.875(1)Å, b=18.380(2)Å, c=10.445(2)Å, β=105.95(1)° and Z=2. The structure exhibits a zero-dimensional (0D) periodic arrangement of bioctahedra (Bi2Cl10)4- surrounded by organic cations 1,4-diazabicyclo[2.2.2]octane (DABCO). The crystal cohesion is achieved by N-H…Cl, N-H…O and O-H…Cl hydrogen interaction linking the different parts of the structure. This compound was characterized by different techniques such as IR, DSC, TGA-DTA, XRD, XPRD and photoluminescence (PL) at room temperature

Synthesis, Crystal Structure and Antimicrobial Properties of 1-Diphenylmethylpiperazine-1,4-Diium Tetrachloridocuprate

New organic/inorganic hybrid (C17H22N2)[CuCl4] was elaborated and studied by single crystal X-ray diffraction. The compound crystallizes in the orthorhombic Pbca space group. The isolated [CuCl4]2- tetrahedra are slightly distorted building a 0-D anionic framework. The double protonation of the organic cation establish N—H···Cl interactions between organic and inorganic moieties leading to self-organized structure. Infrared, UV-Visible and photoluminescence studies were carried out. The in-vitro antibacterial and antifungal activity of the title salt against several microorganisms were studied. The purity of the material was controlled by Rietveld analysis based on structural investigations and X-ray powder diffraction

Etude minéralogique et chimique du phosphate naturel d’Oum El Khecheb (Gafsa, Tunisie)

Abandonné dans les années quatre-vingt du 20ème siècle, le gisement d’Oum El Khecheb, ancienne mine du champ de Métlaoui, fut «redécouvert» de nouveau et programmé pour l’exploitation, toujours par la Compagnie des Phosphates de Gafsa. C’est l’exploration souterraine de ce gisement qui a orienté vers cette initiative d’éventuelle future exploitation d’une zone facile à entreprendre. En prenant pour objet d’étude la série phosphatée du gisement d’Oum El Khecheb, nous avons cherché à identifier les différences et les similitudes de nature pétrographique, minéralogique ou géochimique existant entre les différentes couches et fractions.L’étude minéralogique a sélectionné les couches CII, CV, CVI et CVIII comme étant lesplus minéralisées et potentiellement les plus rentables. Les différentes analyses effectuées sur le phosphate de cette tranchée ont montré que ce dernier présente un intérêt économique important en raison de sa forte teneur en P2O5 jusqu’à 29% dans certaines couches et un rendement chimique qui atteint 90 %, malgré les concentrations relativement élevées en MgO et Cd. La fraction marchande est composée de particules comprises entre 71 et 2000 µm ; la fluorpatite et la francolite y sont souvent accompagnées de carbonates, de certains silicates et de gypse. Pour les argiles, seule la palygorskite a été mise en évidence par DRX dans la fraction fine (< 71 µm). Mots-clés: phosphate, traitement, DRX, Spectroscopies infrarouges, ATD et ATG

Traitement et valorisation des rejets de phosphates de Gafsa Treatment and Valorization of Waste Gafsa pohosphate

Abstract- Phosphogypsum is a by-product of the fertilizer industry obtained during the attack natural calcium phosphates with sulfuric acid. Storage and management of this toxic and annoying waste are a problem that affects many countries producing phosphate fertilizer, especially since discards are, in principle, prohibited by international law. Therefore, phosphogypsum is a major preoccupation in the research of a solution for its recovering or its removal. In this work, we were interested in characterizing two phosphogypsum located in Gafsa basin, in the south-west of Tunisia. Two samples from two different deposits (silica phosphogypsum of M'dhilla and phosphogypsum of Om Lackcheb) were treated with different products and solvents in order to explore the possibility of recovery. Before and after treatment, they were characterized by X-ray diffraction, chemical analysis, scanning electron microscopy and infrared spectroscopy.Résumé- Le phosphogypse est un sous-produit de l'industrie des engrais obtenu lors de l'attaque des phosphates de calcium naturels par l'acide sulfurique. Le stockage et la gestion de ce déchet toxique et gênant sont un problème qui concerne beaucoup de pays producteurs d’engrais phosphatés surtout que les rejets en mer sont en principe interdits par la législation internationale. De ce fait, les phosphogypses constituent une préoccupation majeure dans la recherche en vue de leur valorisation ou de leur élimination. Dans ce travail, nous nous sommes intéressés à caractériser deux phosphogypses du bassin de Gafsa situé dans le sud-ouest de la Tunisie. Deux échantillons provenant de deux gisements différents (phosphogypse siliceux de M’dhilla et phosphogypse d’Om Lackcheb) ont été traités par différents produits et solvants afin d'étudier la possibilité de leur valorisation. Avant et après leur traitement, ils ont été caractérisés par diffraction des rayons X, analyses chimiques, microscopie électronique à balayage et spectroscopie infrarouge.

catena-Poly[bis­(4-amino­pyridinium) [[diaqua­manganese(II)]-di-μ-chlorido] dichloride]

Single crystals of the title organic–inorganic hybrid, {(C5H7N2)2[MnCl2(H2O)2]Cl2}n, were synthesized from an ethanol solution containing manganese(II) chloride tetra­hydrate and 4-amino­pyridine under acidic conditions. The asymmetric unit contains a disordered organic cation (occupancies in the ratio 0.72:0.28), a chloride anion and an MnCl(H2O) moiety with the MnII atom located on an inversion center. The structure is built up of infinite chains of edge-sharing [MnCl4(H2O)2] octa­hedra developing parallel to the a axis which are separated by the 4-amino­pyridinium ions and discrete chloride ions. The organic cations occupy the empty space around each inorganic chain. Structural cohesion is organized through N—H⋯Cl and O—H⋯Cl hydrogen bonds, which build up a three-dimensional network

4-Sulfamoylanilinium chloride

In the crystal structure of the title compound, C6H9N2O2S+·Cl−, the chloride anions are sandwiched between layers of 4-sulfonamido­anilinium anions. The components interact by way of N—H⋯Cl and N—H⋯O hydrogen bonds, building up a three-dimensional network

Synthesis, crystal structures, substitutional and comparative structural analysis of copper diphosphates LiNaCuP2O7, LiKCuP2O7 and Rb0.5Na1.5CuP2O7

The title compounds are members of the M2O-CuO-P2O5 system (M = Li, Na, K and Rb), where the lithium, sodium, potassium, rubidium and cesium phases have already been structurally characterized. The studied diphosphates LiNaCuP2O7, LiKCuP2O7 and Rb0.5Na1.5CuP2O7 belong to a large family of materials of general formula, MM’CuP2O7 (M, M’ = Monovalent cation) where the elements M and M’ ionic radii are decisive in the structural type determination. They were synthesized by solid-state reactions. The X-ray structural analysis show that these compounds crystallize in the P21/n monoclinic lattice where the CuO5 pyramidal square are linked to nearly eclipsed P2O7 groups by corner sharing to build up corrugated layers [CuP2O7]2- extending perpendicularly to [010]. The Li+, Na+, K+ and Rb+ cations reside in the interlayer space and in cavities delimited by the anionic network. In this study, the synthesis, the structure, the powder diffraction, the infrared spectroscopy, the thermal analysis (DTA/TGA) and a structural comparison are presented. The structural models were validated by Bond Valence-Sum (BVS) and charge distribution (CHARDI) analysis