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
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Journal ArticleDOI
Novel cytotoxic diterpenes from Casearia arborea.
John A. Beutler,Kate L. McCall,Kathryn Herbert,Delbert L. Herald,George R. Pettit,Tanya R. Johnson,Robert H. Shoemaker,Michael R. Boyd +7 more
TL;DR: Cytotoxicity-guided fractionation of the dichloromethane-methanol extract of the roots of Casearia arborea yielded five novel clerodane diterpenes, casearborins A-E (1-5), as well as cucurbitacin B.
Journal ArticleDOI
Spectral and structural studies of metal complexes of isatin 3-hexamethyleneiminylthiosemicarbazone prepared electrochemically
Elena Labisbal,Antonio Sousa,Alfonso Castiñeiras,José A. García-Vázquez,Jaime Romero,Douglas X. West +5 more
TL;DR: In this article, the coordination of the Ishexim anions is via the imine nitrogen and thiolato sulfur atoms with evidence for weak interaction of the amide oxygen with the isatin portion of the ligand.
Journal ArticleDOI
Significant antiferromagnetic coupling in a terephthalate (ta)-bridged manganese(II) compound: preparation, crystal structure and magnetic properties of the chain [Mn2(bipy)4(ta)][ClO4]2(bipy = 2,2′-bipyridine)
Juan Cano,Giovanni De Munno,José Luis Sanz,Rafael Ruiz,Francesc Lloret,Juan Faus,Miguel Julve +6 more
TL;DR: In this article, a new manganese(II) compound [Mn2(bipy)4(ta)][ClO4]21 has been synthesized and its crystal structure determined by single-crystal X-ray diffraction.
Journal ArticleDOI
Amphiphilic properties of synthetic glycolipids based on amide linkages. II. Crystal and molecular structure of N-(n-octyl)-D-gluconamide, an amphiphilic molecule in head-to-tail packing mode
V. Zabel,Anke Müller-Fahrnow,R. Hilgenfeld,Wolfram Saenger,Beate Pfannemüller,V. Enkelmann,Wolfram Welte +6 more
TL;DR: The crystal structure of N-(n-octyl)-D-gluconamide (space group P21, a = 5.252(1), b = 32.426(9), c = 4.805(1) A, β = 94.96(5)° ) was determined by X-ray diffraction methods and refined to R = 0.046 as mentioned in this paper.
Book ChapterDOI
Investigations into the Engineering of Inorganic/Organic Solids: Hydrothermal Synthesis and Structure Characterization of One-Dimensional Molybdenum Oxide Polymers
Yan Xu,Li-Hua An,L. L. Koh +2 more
TL;DR: In this paper, two one-dimensional intercalating molybdenum oxide polymers have been synthesized using different structure-directing units under specific hydrothermal conditions.
References
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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.