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Journal ArticleDOI

A semi-empirical method of absorption correction

A. C. T. North, +2 more
- 01 May 1968 - 
- Vol. 24, Iss: 3, pp 351-359
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.

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Citations
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Journal ArticleDOI

The Crystal and Molecular Structure of Chloro-α,β,γ,δ-tetraphenylporphinatocobalt(III)

TL;DR: The structure of the title compound, C44H28N4CoCl, has been determined by single-crystal X-ray diffraction as discussed by the authors, with a=b=13.693(2), c=9.701(2) A, and Z=2.149 (6) A.
Journal ArticleDOI

Synthesis and characterisation of new polynuclear copper(I) pyrazolate complexes and their catalytic activity in the cyclopropanation of olefins

TL;DR: The reaction of [Cu(CH3CN)4]-BF4 with racemic pyrazole-3,5-dicarboxylic acid di-sec-butyl ester (3, 5-Dicarbo-sec)-butoxypyrazole, Hdcsbpz) or with pyrazoles-3-5-di-ter-butyric (3.5-DI-terbutyl) (3
Journal ArticleDOI

One-Dimensional Coordination Polymers of Silver(I) with Aminomethylpyridines. Example of a Triple Helical Infinite Chain

TL;DR: In this paper, the crystal structures of the three isomeric compounds Ag(2-amp)ClO4 (1), Ag(3-amp), ClO4(2), and Ag(4-amp, 3)-O4 were revealed, which reveal different packing arrangements of one-dimensional infinite chain coordination polymers.
Journal ArticleDOI

Crystal structure at 2.6 A resolution of the complex of subtilisin BPN' with streptomyces subtilisin inhibitor.

TL;DR: Steric homology of the two contact regions between the inhibitors of the SSI family and the pancreatic secretory trypsin inhibitor-ovomucoid inhibitor family is so high that it seems to indicate divergent evolutionary processes and to support the general notion as to the relationship of prokaryotic and eukaryotic genes put forward by Doolittle (1978).
References
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Journal ArticleDOI

X-ray crystallography

M J Buerger
ReportDOI

A fortran program for calculating single crystal absorption corrections

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.
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