Journal ArticleDOI
A semi-empirical method of absorption correction
TLDR
An extension of Furnas's method is described in this paper, where the variation of intensity of an axial reflection as the crystal is rotated about the goniometer axis is used to give a curve of relative transmission T against azimuthal angle ϕ for the corresponding reciprocal lattice level.Abstract:
An extension of Furnas's method is described. The variation of intensity of an axial reflection as the crystal is rotated about the goniometer axis is used to give a curve of relative transmission T against azimuthal angle ϕ for the corresponding reciprocal lattice level. Transmission coefficients for any general reflexion hkl are then given approximately by T(hkl) = [T(ϕinc) + T(ϕret)]/2 where ϕinc and ϕret are the azimuthal angles of the incident and reflected beams. Equations are derived for (ϕinc and ϕret and the accuracy of the method is discussed.read more
Citations
More filters
Journal ArticleDOI
New Family of Thiocyanate-Bridged Re(IV)-SCN-M(II) (M = Ni, Co, Fe, and Mn) Heterobimetallic Compounds: Synthesis, Crystal Structure, and Magnetic Properties
Ricardo González,Alvaro Acosta,Raúl Chiozzone,Carlos Kremer,Donatella Armentano,Giovanni De Munno,Miguel Julve,Francesc Lloret,Juan Faus +8 more
TL;DR: The heterobimetallic complexes of formula [(Me(2)phen)(2)M(μ-NCS)Re(NCS)(5)]·CH(3)CN [Me( 2)phen = 2,9-dimethyl-1,10-phenanthroline and M = Ni (1), Co (2), Fe (3), and Mn (4)] have been prepared, and their crystal structures have been determined by X-ray diffraction on single crystals
Journal ArticleDOI
cis- and trans-Dichloro-derivatives of six- and seven-co-ordinate zirconium and hafnium bonded to quadridentate Schiff-base ligands. Crystal structures of [Zr(acen)Cl2(thf)], [M(salphen)Cl2(thf)]·0.5thf, [M(acen)Cl2], (M = Zr or Hf), and [Zr(msal)Cl2][acen =N,N′-ethylenebis(acetylacetoneiminate), salphen =N,N′-o-phenylenebis(salicylideneiminate), msal =N-methylsalicylideneiminate, and thf = tetrahydrofuran]
TL;DR: In this paper, it was shown that the metal ion is seven-coordinate with a pseudo-pentagonal bipyramidal geometry, and the corresponding isostructural hafnium complex [Hf(salphen) Cl2(thf)]·0.033 for 3 813 observed reflections.
Journal ArticleDOI
Characterization and biological activities of two copper(II) complexes with diethylenetriamine and 2,2′-bipyridine or 1,10-phenanthroline as ligands
Ram N. Patel,Nripendra Singh,K.K. Shukla,Juan Niclós-Gutiérrez,Alfonso Castiñeiras,V. G. Vaidyanathan,Balachandran Unni Nair +6 more
TL;DR: Two new mixed ligand copper(II) complexes with diethylenetriamine, 2,2'-bipyridine and 1,10-phenanthroline have been synthesized and show the higher SOD activity than the corresponding simple Cu( II)-dien/Cu(II)-PMDT complexes because of a strong axial bond of one of the nitrogen atoms of the alpha-diimine.
Journal ArticleDOI
Synthesis, XRD structures and properties of diaqua(iminodiacetato)copper(II), [Cu(IDA)(H2O)2], and aqua(benzimidazole)(iminodiacetato)copper(II), [Cu(IDA)(HBzIm)(H2O)]
M.J Román-Alpiste,J.D. Martín-Ramos,A Castiñeiras-Campos,E Bugella-Altamirano,A.G Sicilia-Zafra,Josefa María González-Pérez,Juan Niclós-Gutiérrez +6 more
TL;DR: In this article, the stoichiometric reaction of copper(II) hydroxycarbonate with iminodiacetic acid (H2IDA) in water under reduced pressure yields good crystalline samples of [Cu(IDA)(H2O)2] (compound I).
Journal ArticleDOI
Oxidative nuclease activity of ferromagnetically coupled μ-hydroxo-μ-propionato copper(II) complexes [Cu3(L)2(μ-OH)2(μ-propionato)2] (L = N-(pyrid-2-ylmethyl)R-sulfonamidato, R = benzene, toluene, naphthalene)
José Luis García-Giménez,Gloria Alzuet,Marta González-Álvarez,Malva Liu-González,Alfonso Castiñeiras,Joaquín Borrás +5 more
TL;DR: All three Cu(II) complexes were found to be very efficient agents of plasmid DNA cleavage in the presence of ascorbato or mercaptopropionic acid.
References
More filters
Book
International tables for X-ray crystallography
Norman Fordyce McKerron Henry,Lonsdale, Kathleen, Dame,John S. Kasper,Caroline H. MacGillavry,Gerard D. Rieck,James A. Ibers,Walter C. Hamilton +6 more
ReportDOI
A fortran program for calculating single crystal absorption corrections
D.J. Wehe,W.R. Busing,H.A. Levy +2 more
TL;DR: A Fortran program is described for calculating the absorption correction for application to single crystal x ray or neutron intensity measurements and is available in the form of symbolic punched cards.