Solid-State Reactivity and Implications for Catalytic Processes

Болдырева, Е. В.

doi:10.1007/978-94-011-4653-1_11

Cited by 3 publications

(2 citation statements)

References 85 publications

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“…The precipitation of nickel hydroxide from urea-containing solutions can be rationalized interpreting the Ostwald step rule in terms of the principle of minimal structural change ; , this implies that the coordinative environment of the aqueous species that promote nucleation should closely resemble those of the ions in the solid state. As urea hydrolyzes, different nickel hydroxo species form along with cyanate and bicarbonate complexes.…”

Section: Discussionmentioning

confidence: 99%

Synthesis of Nickel Hydroxide by Homogeneous Alkalinization. Precipitation Mechanism

et al. 1999

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Uniform microcrystalline nickel(II) hydroxide particles have been prepared via the homogeneous alkalinization of nickel(II) nitrate solutions by urea hydrolysis. The nature of the precipitated solids depends on the temperature of synthesis. At ca. 423 K, i.e., under the hydrothermal conditions attained by microwave heating, β-Ni(OH) 2 forms upon the fast ripening of R-Ni(OH) 2 . In the range 363-343 K, R-Ni(OH) 2 is always the final product. The evolution of the systems during the precipitation of R-Ni(OH) 2 is analyzed in terms of the kinetic factors that control nucleation and growth. A precipitation mechanism, based on the principle of minimal structural change, is proposed; it is suggested that the edge-on condensation of Ni 4 (OH) 4 4+ tetramers is a key step in the sequence of events that conduct from hexaaquo Ni 2+ to R-Ni(OH) 2 .

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Section: Discussionmentioning

confidence: 99%

Synthesis of Nickel Hydroxide by Homogeneous Alkalinization. Precipitation Mechanism

et al. 1999

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“…Varying conditions of desolvation, one can produce samples of the same polymorph differing in particle size, morphology, type and concentration of defects. This method is a variant of a more general method of using various precursors to modify the properties of solid materials obtained in the course of solid-state reactions. − In some cases, decomposition of different precursors can give different polymorphs. This is widely used for a long time to obtain different polymorphs of inorganic compounds, for example of oxides applied as catalysts. , In the last years the same technique was used to produce different polymorphs of drugs, some of which cannot be easily obtained by direct crystallization from solutions. ,− Recently it was found that 2,4,6-triethyl-1,3,5-tris(phenoxymethyl)-benzene can form 10 different solvates which lead to the formation of 3 different polymorphs on desolvation .…”

Section: Introductionmentioning

confidence: 99%

Furosemide Solvates: Can They Serve As Precursors to Different Polymorphs of Furosemide?

Minkov

Beloborodova

Drebushchak

et al. 2014

Crystal Growth & Design

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In the present work, four solvates of furosemide with tetrahydrofuran S(THF), 1,4-dioxane S(DIOX), N,N-dimethylformamide S(DMF), and dimethylsulfoxide S(DMSO) were crystallized, the crystal structures were solved for S(THF), S(DIOX), and S(DMF). The existence of S(THF) and S(DMSO) was not reported before; for the previously known S(DIOX) and S(DMF), the crystal structures remained unsolved. The detailed structural analysis of furosemide containing crystal structures showed that the molecule of furosemide has a high conformational lability because of the rotations of the sulfamoyl and furanylmethylamino fragments. Some of the furosemide conformations were shown to be stabilized by the intramolecular N− H•••Cl hydrogen bond. Desolvation of the four solvates was studied by TG and X-ray diffraction and was shown to give different products depending on the precursor and particle size: the desolvation of powder of S(THF) and the large crystals of S(THF), S(DIOX), and S(DMF) gives Form-III of furosemide, whereas powders of S(DIOX), S(DMF), and S(DMSO) give Form-I.

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Preface

Болдырева¹

2007

J Therm Anal Calorim

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Solid-State Reactivity and Implications for Catalytic Processes

Cited by 3 publications

References 85 publications

Synthesis of Nickel Hydroxide by Homogeneous Alkalinization. Precipitation Mechanism

Synthesis of Nickel Hydroxide by Homogeneous Alkalinization. Precipitation Mechanism

Furosemide Solvates: Can They Serve As Precursors to Different Polymorphs of Furosemide?

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