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51.
52.
M. Zabel A. L. Poznyak V. I. Pawlowski 《Russian Journal of Coordination Chemistry》2005,31(8):559-564
Crystals with uncommon composition NaBa6[Co(Edta)]4(ClO4)9 · 30H2O (Edta4− is ethylenediaminetetraacetic acid anion) were obtained with the following unit cell parameters: a = 14.8513(9) Å, b = 26.2361(15) Å, c = 15.1789(9) Å, α = 91.661(7)°, β = 113.035(7)°, γ = 89.897(7)°, space group P1¯. Each complex anion [Co(Edta)]− is bonded through the carboxyl O atoms to five Ba atoms to give three-dimensional framework in a crystal. One perchlorate ion forms Ba-O-Cl-O-Ba bridge between the Ba atoms; four ClO
4
−
ions are isolated, while the remaining four ions act as monodentate ligands at the Ba atoms. The water molecules (25 in sum) complete the coordination sphere of the Ba atoms to eight-, nine-, or ten-vertex polyhedron. Four water molecules are in the closest surrounding of the Na atom, one H2O molecule is isolated.__________Translated from Koordinatsionnaya Khimiya, Vol. 31, No. 8, 2005, pp. 590–595.Original Russian Text Copyright © 2005 by Zabel, Poznyak, Pawlowski. 相似文献
53.
Dichloro(ethylenediamone)copper(II) crystals undergo a phase transition at 138 K. X-ray crystal structure analysis at 123 K and 173 K showed that the phase transition is associated with ordering of both carbon atoms; space group changes from P21/m to P21/c, and the c parameter of the unit cell is nearly doubled. 相似文献
54.
Michael Hanack Konrad Mitulla Georg Pawlowski L.R. Subramanian 《Journal of organometallic chemistry》1980,204(3):315-325
The preparation of several new trans-bis-1-alkynyl(phthalocyaninato)silicon (VIc—f), -germanium (VIIc—f) and -tin (VIIId, f) compounds as well as trans-bis-1-alkynyl(hemiporphyrazinato)germanium (XIc, e, f) derivatives is described. The products were obtained in high yields by treating the corresponding dichlorides (I, II, IV, X; X = (Cl) with 1-alkynyl Grignard reagents (Vc—f) in tetrahydrofuran (THF) and were characterized spectroscopically. The compounds obtained are considered as models for a new kind of one-dimensional conductor. 相似文献
55.
The crystals of Ca(H2Edta)·2H2O (orthorhombic system, a = 8.5919(7) Å, b = 17.807(2) Å, c = 18.941(2) Å; Z = 8, space group Pbca) precipitate from solutions of Na2H2Edta·2H2O and CaCl2. The Ca atom is surrounded by the oxygen atoms of the water molecule and the carboxyl groups of the five neighboring H2Edta2? anions with protonated nitrogen atoms (distorted octahedron). As a result, a three-dimensional framework of [Ca(H2O)H2Edta)] with built-in crystal water molecules is formed. 相似文献
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57.
We analyse different error propagation mechanisms for conservativeand nonconservative time-integrators of nonlinear Schrödingerequations. We use a geometric approach based on interpretingwaves as relative equilibria. 相似文献
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