Von reaktiven molekularen Vorläufern zu höhervernetzten Lanthanoid-Oxonitridocarbonaten und nanokristallinen Lanthanoid-Nitrid-Materialien

During the course of this research project the synthesis of highly
reactive lanthanide and O2CN-containing molecular precursor
complexes has been investigated. Important issues were the
development of new reaction pathways to these species and the
structural characterization of the N-containing precursors. The
accurate thermal treatment of these complexes using various
reaction gases yielded both lanthanide nitrides and highly
condensed lanthanide oxo-nitrido carbonates using different types
of gases. The observed degradation reactions to the products were
characterized thoroughly. According to this procedure, novel and
known compounds have been synthesized and investigated carefully
regarding their structural and material properties. The application
of CO2 as an important preorganized C/O-donor for addition
reactions at the Ln/N precursor complex represented one of the
major topics in this project. This “green reagent” can be
considered as a promising species for future industrial
applications. A new reaction pathway utilizing the decomposition
reaction of N-containing organo¬lanthanides revealed the formation
of highly aggregated nanocrystalline lanthanide nitrides at low
temperatures. Novel Ln/O/C/N-solids were synthesized by thermal
degradation of CO2-activated precursor complexes. The Ln/N and
Ln/O/C/N species obtained can be considered as single-source
molecular precursors and potential Ln/O/C/N-dopants for
applications in the synthesis of O/C/N materials.