Hydrated neodymium(III) and europium(III) picrate complexes with pyrazine-N-oxide

Autor:	Klaus Zinner, Geraldo Vicentini, D.M Araújo Melo, E. P. Marinho, J. Zukerman-Schpector, L.B. Zinner
Rok vydání:	2000
Předmět:	Lanthanide Denticity Pyrazine Chemistry Mechanical Engineering Picrate Inorganic chemistry Metals and Alloys chemistry.chemical_element Infrared spectroscopy Crystal structure Triclinic crystal system chemistry.chemical_compound Crystallography Mechanics of Materials Materials Chemistry Europium
Zdroj:	Journal of Alloys and Compounds. :116-120
ISSN:	0925-8388
DOI:	10.1016/s0925-8388(00)00615-0
Popis:	Compounds with composition Ln(pic)3·2pyzNO·7H2O (Ln=Nd, Eu; pic=picrate; pyzNO=pyrazine-N-oxide) were obtained by reaction of the hydrated lanthanide picrate with pyrazine-N-oxide in ethanol (molar ratio 1:4). The adducts were characterized by elemental analyses and IR spectra. X-ray single crystal data for the neodymium complex indicate that the crystal system is triclinic, space group P 1. Nd unit cell dimensions are: a=7.930(1) A; b=12.869(1) A; c=20.833(1) A; α=106.414(7) A; β=92.574(7) A; γ=92.202(9) A; V=2034.4(3) A; Z=2. Europium cell parameter are a=7.882(1) A, b=12.880(1) A, c=20.788(2) A, α=106.224(8)°, β=92.055(7)°, γ=93.140(7)°. One picrate is bidentate, coordinated through the phenoxo oxygen and one oxygen of an o-nitro group and two are not coordinated. One pyrazine-N-oxide is bonded through the oxygen and the other is out of sphere. Six water molecules are bonded and a seventh is not coordinated. The coordination polyhedron is a distorted tricapped trigonal prism.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::753f01955f3fea51f1f9c9d4b2192ea1 https://doi.org/10.1016/s0925-8388(00)00615-0 Zobrazit plný text záznamu Full Text from ScienceDirect