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
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Solid solution between piemontite and androsite-(La), a new mineral of the epidote group from Andros Island, Greece
TL;DR: A new member of the epidote group, androsite-(La), was found at Andros Island, Cyclades, Greece, as an accessory constituent of metamorphic Mn-rich rocks as mentioned in this paper.
Journal ArticleDOI
Synthesis of cationic uranium compounds by protonolysis of amide precursors: cyclopentadienyl and cyclooctatetraene complexes
Jean-Claude Berthet,Christophe Boisson,Monique Lance,Julien Vigner,Martine Nierlich,Michel Ephritikhine +5 more
TL;DR: The cationic organouranium(IV) compounds [U(η-C5H5)3(thf) as discussed by the authors ] have been synthesized from neutral amide precursors by protonolysis of the UNR2(R = Et or Me) bond with NHEt3BPh4; the crystal structures of 2 and 8 have been determined.
Journal ArticleDOI
X-ray crystallographic studies of seal myoglobin
Helen Scouloudi,Edward N. Baker +1 more
Journal ArticleDOI
Reactions of the dichloroboryl complex of osmium, Os(BCl2)Cl(CO)(PPh3)2, with water, alcohols, and amines: Crystal structures of Os[B(OH)2]Cl(CO)(PPh3)2, Os[B(OEt)2]Cl(CO)(PPh3)2, and Os[BN(CH3)C6H4N(CH3)]Cl(CO)(PPh3)2
TL;DR: In this paper, a tetragonal pyramidal geometry with the diethoxyboryl ligand in the apical site and with an OsB bond distance of 2.081(5) A.
Journal ArticleDOI
Synthesis and structural study of novel 1,4,5,6,7,8-hexahydroquinolines†
Margarita Suárez,Yamila Verdecia,Estael Ochoa,Nazario Martín,Roberto Martínez,Margarita Quinteir,Carlos Seoane,José L. Soto,Héctor Novoa,Norbert Blaton,Oswald M. Peeters,Camiel J. De Ranter +11 more
TL;DR: In this paper, a series of 1,4,5,6,7,8-hexahydroquinolines (9a-j) has been synthesized and their structural features studied by X-ray analysis and theoretical calculations at semi-empirical and ab initio levels.
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.