Synthesis of tetraarylborates via tetralithio intermediates and the effect of polar functional groups and cations on their crystal structures

2018 ◽  
Vol 47 (46) ◽  
pp. 16627-16637 ◽  
Author(s):  
Patryk Tomaszewski ◽  
Marcin Wiszniewski ◽  
Janusz Serwatowski ◽  
Krzysztof Woźniak ◽  
Krzysztof Durka ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Functional Groups ◽  
Structural Characterization ◽  
X Ray ◽  
Polar Functional Groups

The synthesis and X-ray structural characterization of functionalized (COOH, CHO, C(O)NHtBu, B(OH)2) tetraphenyl- and tetrakis(4′-biphenylyl)borates is reported.

Structural Characterization of Cationic 16-Electron Pentamethylcyclopentadienyl Ruthenium(II) Complexes Containing the Binuclear [Cp*Ru(μ-Cl)3RuCp*]– Anion

2008 ◽  
Vol 63 (10) ◽  
pp. 1155-1159 ◽  
Author(s):  
Thomas Glöge ◽  
Dejan Petrovic ◽  
Cristian G. Hrib ◽  
Peter G. Jones ◽  
Matthias Tamm
Keyword(s):  
Crystal Structures ◽  
Structural Characterization ◽  
Complex Salt ◽  
Monoclinic Space Group ◽  
Chlorine Atoms ◽  
Space Group ◽  
X Ray ◽  
Diimine Ligand ◽  
Half Sandwich

AbstractThe reaction of the diimine ligand 1,2-bis(1,3-diisopropyl-4,5-dimethylimidazolin-2-imino)ethane (BLiPr) with tetrameric [Cp*RuCl]4 in a 1 : 0.75 ratio afforded the complex salt [1][2] containing the 16-electron half-sandwich cation [Cp*Ru(BLiPr)]+ (1) and the dinuclear anion [Cp*Ru(μ- Cl)3RuCp*]− (2). The X-ray crystal structures of [1][2]·31/2THF (monoclinic, space group P21/n, Z = 4) and of [1][2]·THF (monoclinic, space group C2/m, Z = 4) are reported, allowing the structural characterization of the unprecedented anion 2, in which two [(η5-C5Me5)Ru(II)] moieties are bridged by three μ2-chlorine atoms.

scholarly journals Structural Characterization of Albendazole with the Use of X-Ray Diffraction

2014 ◽  
Vol 70 (a1) ◽  
pp. C1808-C1808 ◽  
Author(s):  
Kelly Lixandrão ◽  
Fabio Ferreira
Keyword(s):  
Crystal Structures ◽  
Structural Characterization ◽  
Rietveld Method ◽  
Low Cost ◽  
Chemical Properties ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Physical Chemical

Drugs may present polycrystalline polymorphism (property of a substance to crystallize in more than one form or crystal structure). These variations can cause changes in physical-chemical properties and differences between the polymorphs as shape, solubility, density, melting range, among other consequences, leading to formulations that are not effective, although the chemical formula is the same [1]. Drugs such as albendazole (C12H15N3O2S, which is one of the most effective anthelmintics, [2] showing activity against nematodes, trematodes and cestodes, reasons that added to its safety and low cost have made it a drug widely used in human medicine and veterinary), has more than two different crystal structures, and only two of them are known. The X-ray powder diffraction is a powerful technique used in the structural characterization of drugs, and coupled with the Rietveld method [4], the quantification of the active phases, through the knowledge of their crystal structures, becomes possible. In this paper we discuss results on the differences between the polymorphs of albendazole, with data obtained by means of X-ray diffraction, thermal analysis (differential scanning calorimetry and thermogravimetric analysis), Fourier transform infrared spectroscopy and scanning electron microscopy.

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