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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Preparation, Crystal Structures, and Magnetic and ESR Properties of Molecular Assemblies of Ferrocenium Derivatives and Paramagnetic Polyoxometalates
TL;DR: In this paper, the Anderson−Evans polyanion of the anhydrous salt Na3[Cr(OH)6Mo6O18]·6(CH3)2SO (CrDMSO) was used for the synthesis of two new molecular compounds based on the Anderson-Evans-polyanion.
Journal ArticleDOI
Cucurbitane triterpenoids from Leucopaxillus gentianeus.
TL;DR: Free cucurbitacin B is presumed to be formed in vivo by an enzyme-mediated scission of esters 2a-c, thus constituting a chemical weapon that protects the mushrooms against parasites and predators.
Journal ArticleDOI
Three transition metal complexes formed with tripodal polyimidazole ligands: synthesis, crystal structures and reactivity toward superoxide
TL;DR: In this article, two tripodal heptadentate ligands, tris{2]-2-(1-methyl)imidazolyl]methyliminoethyl}amine ((mim)3tren) and tris {2-(2-( 1-methyl)-methylaminoethyl)methylmethylonitrile}amine (mim)-3htren), containing polyimidrazole groups were synthesized.
Journal ArticleDOI
Synthesis and characterisation of a pair of azo anion radicals bonded to ruthenium(II)
TL;DR: In this paper, the green paramagnetic (S = ½) and EPR-active (g ≈ 2.00) title anion radical complexes [Ru(L1·−)(Cl)(CO)(PPh3)2] 1 and [Ru[L2·−]-)(Br)(CO, PPh3] 2 in which the N-N bond lengths lie near 1.35 A.
Journal ArticleDOI
High-pressure transformation behaviour of the cummingtonite-grunerite solid solution
TL;DR: In this paper, the displacive C2/m ⟷ P2 1 /m phase transition that occurs with increasing pressure in cummingtonites has been investigated by means of X-ray single-crystal diffraction at different compositions and degrees of Mg/Fe 2+ order.
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.