RESUMO
The title compound, poly[bis-(ß-alaninium) [[di-bromido-plumbate]-di-µ-di-bromido]] {(C2H8NO2)2[PbBr4]} n or (ß-AlaH)2PbBr4, crystallizes in the monoclinic space group P21/n. The (PbBr4)2- anion is located on a general position and has a two-dimensional polymeric structure. The Pb center is holodirected. The supra-molecular network is mainly based on O-Hâ¯Br, N-Hâ¯Br and N-Hâ¯O hydrogen bonds.
RESUMO
The crystal structure of hexa-glycinium tetra-µ-iodido-octa-iodido-triplumbate, (C2H6NO2)6[Pb3I12] or (GlyH)6[Pb3I12], is reported. The compound crystallizes in the triclinic space group P. The [Pb3I12]6- anion is discrete and located around a special position: the central Pb ion located on the inversion center is holodirected, while the other two are hemidirected. The supra-molecular nature is mainly based on C-Hâ¯I, N-Hâ¯I, O-Hâ¯I and N-Hâ¯O hydrogen bonds. Dimeric cations of type (A +â¯A +) for the amino acid glycine are observed for the first time.
RESUMO
In order to investigate the possibility of salt formation in the L-Arg-H3PO3-H2O system, single crystals of L-argininium phosphite, C6H15N4O2(+)·H2PO3(-), were prepared by evaporation of an aqueous solution containing equimolar quantities of L-arginine and phosphorous acid. The asymmetric unit contains one L-argininium(+) cation and one phosphite [HPO2(OH)](-) anion. The phosphite anions form chains parallel to [010] by O-H...O hydrogen bonding, with an O...O distance of 2.630â (3)â Å. The protonated amine and guanidyl groups of the L-argininium(+) cations form N-H...O hydrogen bonds with the carboxylate groups and anions. The IR and Raman spectra are discussed in relation to the crystal structure. The salt displays nonlinear optical (NLO) properties. Another salt was obtained from a solution with a 1:2 molar ratio of components, but was characterized by vibrational spectra only.
Assuntos
Arginina/análogos & derivados , Arginina/química , Fosfitos/química , Ânions/química , Cristalografia por Raios X , Ligação de Hidrogênio , Análise Espectral Raman , TemperaturaRESUMO
The monoclinic crystal structure of tetrasarcosine potassium iodide dihydrate {or catena-poly[[potassium-tetra-µ-sarcosine-κ(4)O:O';κ(4)O:O] iodide dihydrate]}, {[K(C(3)H(7)NO(2))(4)]I·2H(2)O}(n) or Sar(4)·KI·2H(2)O (space group C2/c), comprises two crystallographically different sarcosine molecules and one water molecule on general positions, and one K(+) cation and one I(-) anion located on twofold axes. The irregular eight-coordinated K(+) polyhedra are connected into infinite chains along [001] via sarcosine molecules. This compound is the first sarcosine metal halogenide salt with a 4:1 ratio. A short overview of other sarcosine metal halogenide salts is presented and relationships to similar glycine salts are discussed.
Assuntos
Chenopodiaceae/química , Iodetos/química , Íons/química , Metais/química , Potássio/química , Sarcosina/química , Cristalografia por Raios X , Ligação de Hidrogênio , Estrutura MolecularRESUMO
The crystal grown and characterized in the title paper in reality is diglycine picrate.