U. Bentrup, M. Feist, E. Kemnitz
1999
Citations
0
Influential Citations
37
Citations
Journal
Progress in Solid State Chemistry
Abstract
Abstract The crystal structures, spectroscopic characterization, and thermal behavior of fluoro, chloro, and bromo complexes preferably of aluminium, iron and manganese formed with organic cations are reviewed. Compared with the structural chemistry of complexes with alkali metal cations, the use of quarternary ammonium or protonated N-containing base cations considerably extends the structural variety of halogenocomplexes and, in certain cases, allows the access to new modifications of metal fluorides if a suitable precursor compound is thermally decomposed. For most of the described new compounds, the formation of the final structure is governed by the anionic part. Isolated anions [MF 6 − n (H 2 O) n ] (3 − n)− connected via hydrogen bridges are the predominant structure motifs. However, multi-nuclear units as well as chain structures can be prepared from aqueous HX solutions, too. Due to the hydrogen atoms provided by the organic cations, additional hydrogen bonds stabilize various novel structures. Some special structural features will be presented, e.g. the discrete tetrafluoroaluminate complex as well as pentacoordinated aluminium and iron(II).