Mössbauer study and magnetic properties of bis (ethanol) tetraphenylporphinatoiron (III) tetrafluoroborate [Fe(EtOH)2 (tpp)]+BF 4 −

Mössbauer experiments and magnetic measurements have been performed at various temperatures between 1.8 and 300 K on a six-coordinated iron porphyrin [Fe(EtOH)₂ (tpp)]⁺BF ₄ ^? . All the results are consistent with the presence of high-spin iron (III) with an unambigous S=5/2 ground state. A marked reversal of the asymmetric broadening of the quadrupole doublet lines has been observed between 1.8 and 300 K. This asymmetric broadening of the lines arising from relaxation effects depends on the directions along which the hyperfine magnetic field fluctuates relative to the principal axes of the e.f.g. tensor.     

Optical spectroscopy and electronic structure of compounds HoNi5 − x Al x (x = 0, 1, 2)

The optical properties of the compounds HoNi_{5 ? x} Al _x (x = 0, 1, 2) have been investigated using the ellipsometric method in the wavelength range from 0.22 to 16 μm. The electronic structure of these intermetallic compounds has been calculated in the local electron-spin density approximation with the correction for strong electronic interactions in the 4f shell of the holmium ions. The experimental dispersion dependences of optical conductivity in the region of interband light absorption have been interpreted based on the results of the calculation of the electron density of states. The plasma and relaxation frequencies of electrons have been determined.     

A study of the system Ag3−xTlxFe(CN)6, (x =0, 1, 2, 3) by Mössbauer spectroscopy

The ferricyanides Ag_3−xTl_xFe(CN)₆, (x = 0, 1, 2, 3) have been measured by Mössbauer spectroscopy. The results indicate a negative EFG for all samples except for x = 1, that is positive. The isomer shift for Tl₃Fe(CN)₆ is the more negative, indicating a strong contribution from the empty p-orbitals of Tl⁺ ions.     

Magnetic susceptibility and 119Sn Mössbauer spectroscopy studies of RAuSn compounds (R=La, Ce, Pr)

In this paper the results of bulk magnetic susceptibility measurements and ¹¹⁹Sn Mössbauer spectroscopy measurements of LaAuSn, CeAuSn and PrAuSn intermetallic compounds are presented. New phase transitions in CeAuSn and PrAuSn compounds have been found by both methods employed. Structural and electronic properties are discussed.     

195Pt,15N NMR spectroscopy of aqueous solutions of mixed valent oxonitrocomplexes,Pt(II,IV): K5[(NO2)3PtIV(μ-O)3 Pt 3 II (NO2)6] and K8[(NO2)6Pt 3 II (μ-O)3PtIV(μ-O)3Pt 3 II (NO2)6]

Two aqueous solutions of oxonitrocomplexes comprising di- and tetravalent platinum atoms, K₅[(NO₂)₃Pt^IV(μ-O)₃Pt ₃ ^II (NO₂)₆]· 3H₂O and K₈[(NO₂)₆Pt ₃ ^II (μ-O)₃Pt^IV (μ-O)₃Pt ₃ ^II (NO₂)₆] · 7H₂O, have been studied by¹⁹⁵Pt and¹⁵N NMR technique. Both compounds, enriched with the¹⁵N (95%) isotope, were synthesized by thermal denitrozylation of K₂[Pt(NO₂)₄]. Constants of spin-spin scalar coupling,¹⁹⁵Pt-¹⁵N and¹⁹⁵Pt^II-¹⁹⁵Pt^IV, were obtained for tetra-and heptameric complexes in aqueous solutions through multiplet simulation. The¹⁹⁵Pt and¹⁵N NMR spectra of the same solutions obtained two months after their preparation show signals from the hydrolytic forms of the tetrameric complex as well as the signals from mono- di- and trimeric oxonitrocomplex forms of divalent platinum. All signals of species formed as a result of hydrolysis were identified.