Soft X-ray magnetic circular dichroism in Fe and Fe 0.50 Co 0.48 V 0.02 films: quantitative analysis of transmission

Magnetic circular dichroism (MCD) in X-ray absorption has been measured at the L _{2, 3} edges of Fe in ex-situ grown Fe and Fe _0.50 Co _0.48 V _0.02 films by means of the transmission method. A new approach is developed for fitting the observed transmittance, which describes the resonance lineshapes as (generalized) Fano profiles. Analytical integration of each single resonance allows a more reliable determination of the orbital and spin magnetic moments based on the MCD sum rules. The results are consistent with an increase of the Fe spin and orbital magnetic moment in Fe-Co alloys as obtained by other experiments and band structure calculations. Received 15 August 2000 and Received in final form 11 June 2001     

Synthesis,Characterization, and Crystal Structure of (2<Emphasis Type="Italic">E</Emphasis>)-3-(4-Fluorophenyl)-1-(2-hydroxyphenyl)prop-2-en-1-one

The title chalcone, of formula C₁₅H₁₁F₁O_2, crystallized in the orthorhombic space group P2₁2₁2₁ (# 19) with crystal parameters a?=?6.9998(8) Å, b?=?12.6740(15) Å, c?=?12.8997(15) Å, V?=?1144.4(2) ų, Z?=?4, determined at 100 K with MoKα radiation. The solid-state structure displays an intramolecular S(6) hydrogen bond and the crystal architecture is maintained by intermolecular F?H, O?H, and C?C short contacts. A DFT geometry optimization is compared with the experimental structure. As ¹⁹F NMR spectroscopy can be used for metabolic tagging of biologically active compounds (including chalcones), the solution-state ¹⁹F chemical shift and ¹³C¹⁹F coupling constants (ⁿJ) are also reported.

Graphical Abstract

Open image in new window