Bücherbesprechungen

Ohne Zusammenfassung     

Bücherbesprechungen

Ohne Zusammenfassung     

Bücherbesprechungen

Ohne Zusammenfassung     

Low temperature magnetic ordering of a series of structurally characterized chloroferrates

Iron-57 Mössbauer spectroscopic results for a new series of related chloroferrate salts of complex ammonium cations are presented. In particular, spectra of materials based on FeCl ₄ ^– , FeCl ₅ ^2– , FeCl ₆ ^– , [FeCl₅(H₂O)]^2–, and [FeCl₅(CH₃OH)]^2– anions are discussed relative to the systematics of their isomer shifts, coordination numbers, and low temperature 3D critical ordering temperatures. The following specific systems have been studied by Mössbauer spectroscopy and definitively characterized by single-crystal X-ray analysis: [CH₃NH ₃ ⁺ ]₄[FeCl₆]^3–[Cl^–](A), [Me₂N(-CH₂CH₂)₂NMe ₂ ⁺ ][FeCl ₅ ^2– ] (B), [H₃NCH₂CH₂NH ₃ ²⁺ ][FeCl₅·H₂O^2–], (C), and [NH₃(CH₂)₆NH ₃ ²⁺ ]₄[(FeCl ₆ ^3– )(FeCl ₄ ^– )ClCl ₄ ^– ] (D). The spectral data for these complexes are considered in the light of results of previous studies for systems such as [K₂FeCl₅·H₂O], [Co(NH₃)₆][FeCl₆], diamethyltriethylenediammoniumpentachloroferrate (E), and the related [FeCl₅·CH₃OH]^2– salt (F). The critical 3D ordering temperatures are 1.45, 6.80, 3.45, and 1.22K forA, B, C, andD, respectively.     

Electronic structure of the valence bands of SnF2 studied by ultraviolet photoelectron spectroscopy

The main features of the photoelectron spectrum of the valence bands of solid-phase SnF₂ are susccessfully interpreted in terms of linear combination of atomic orbitals-molecular orbital theory.     

Bücherbesprechungen

Ohne Zusammenfassung     

Bücherbesprechungen

Ohne Zusammenfassung     

Ueber den Brechungsindex einiger Körper in Gelatine

Ohne Zusammenfassung