Struktur und Remissionsspektren der Ammoniumfluoroniccolate(II)

Abstract

Die komplexen Fluoride (NH4)2NiF4 und NH4NiF3 werden nach verschiedenen Verfahren dargestellt und untersucht. (NH4)2NiF4 besitzt tetragonale Struktur wie K2NiF4, während NH4NiF3 mit hexagonaler und kubischer Struktur auftritt. Die Remissionsspektren werden diskutiert.

X-ray photoelectron spectroscopy of nickel compounds

“…Hayter and Humiec25 have reported a rather unusual group of compounds which can be isolated in tetrahedral and planar forms as rather stable, solid compounds, among which is [n-C3H7P(C6H5)2]2NiBr2. Bis(dibenzoylmethanato)nickel(II) has been isolated in isomers of two different colors:57 one diamagnetic and monomeric with a square-planar distribution of the oxygen atoms about nickel (compound 56) and the other paramagnetic and trimeric with an octahedral distribution of the oxygen atoms about nickel (compound 12).14 Similarly bis(/V-methylsalicylaldimine)nickel(II) also occurs in diamagnetic and paramagnetic isomeric forms (compounds 55 and 13, planar and octahedral, respectively).15 Figure 3 (not corrected for sample charging) shows the XPS spectra of the latter pair of compounds (55 and 13). We see that the planar isomer (55) does not show any shake-up satellites, whereas for the octahedral isomer, compound 13, shake-up satellites appear at 860.2 and 878.5 eV.…”