28 research outputs found

    Synthesis and characterisation of a new hydrated bismuth (III) oxalate : Bi2_2(C2_2O4_4)3_3,6H2_2O

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    This study presents results on synthesis and crystal structure of a new hydrated bismuth(III) oxalate : Bi2_2(C2_2O4_{4})3_3,6H2_2O. This compound is obtained by precipitation from Bi(NO3_3)3_3 solution and oxalic acid. Its structure is determined by X-ray crystallographic analysis from a single crystal: it is monoclinic with a = 9.761(1)Å, b = 8.193(1)Å, c = 10.214(1)Å, β\beta = 99.66(1)^{\circ}, G.S. P21_{1}/n. Its chemical composition is confirmed by chemical analyses, FTIR and TG-DTA experiments

    A new pure paracetamol for direct compression : the orthorhombic form.

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    (Eu0.5Yb0.5)Fe2O4

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    Compression Ability Improvement By Solvation Desolvation Process - Application To Paracetamol for Direct Compression

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    Pure paracetamol for direct compression was prepared by recrystallization in dioxane followed by an appropriate drying process. The polyhedric crystals obtained exhibit a sintered like structure. This porous texture induces plasticity and greatly improves the compressibility. The residual solvent content is clearly less than 100 ppm when the drying is progressive. We have attempted to explain the formation of the sintered texture with the intention of applying this process to other drugs or excipients in order to improve their compression ability. In contrast to the usual hydration/dehydration process applied to lactose, the advantage of this process is the finding of a stable desolvated form; the desolvation of a solvate with organic solvent results in stable material whereas the anhydrates are often unstable
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