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
X-ray studies of aspartic proteinase statine inhibitor complexes.
TL;DR: It is shown conclusively that statine should be considered a dipeptide analogue (occupying P1 to P1') despite lacking the equivalent of a P1' side chain, although other inhibitor residues (especially P2) may compensate by interacting at the unoccupied S1' specificity subsite.
Journal ArticleDOI
2,2′-Bipyrimidine (bipym)-bridged dinuclear complexes. Part 1. Preparation, crystal structure, and magnetic properties of [Ni2(H2O)8(bipym)][NO3]4and [Ni2(H2O)8(bipym)][SO4]2·2H2O
TL;DR: In this paper, two dinuclear nickel(II) complexes of formula [Ni2(H2O)5(bipym)][NO3]41 and [Ni 2(H 2O)8-(bipm)][SO4]2·2H 2 O 2 (bipy = 2,2′-bipyrimidine) have been synthesized and their crystal structures determined by X-ray crystallographic methods.
Journal ArticleDOI
Synthesis of the WW triply bonded dimers [W2(η-C5H4R)2X4](X = Cl, R = Me or Pri; X = Br, R = Pri) and X-ray crystal structures of [W(η-C5H4Pri)Cl4] and [W2(η-C5H4Pri)2Cl4]
TL;DR: The syntheses of the WW triply bonded species [W2(η-C5H4R)2X4] and their singly bonded congeners are reported along with X-ray crystal-structure determinations of [W 2.367 8(6)A].
Journal ArticleDOI
Synthesis, structure and biomimetic properties of Cu(II)-Cu(II) and Cu(II)-Zn(II) binuclear complexes: possible models for the chemistry of Cu-Zn superoxide dismutase.
TL;DR: All the observations indicate that these complexes act as good possible models for superoxide dismutase, and spectral measurements of the homobinuclear complexes have shown an antiferromagnetic exchange interaction.
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.