The review is part of a series of articles which introduce the emerging concept of inverse coordination. The article presents a panorama of inverse coordination complexes (i.e. metal compounds disp...

Inverse coordination metal complexes with oxalate and sulfur, selenium and nitrogen analogues as coordination centers. Topology and systematization

Synthesis and spectroscopic characterization of mixed-fluoro complexes of UO22+ containing amino acids, acetylacetonate or acetate as the co-ligands and the first report on the heptafluoroxioxouranate(VI) complex [UO2F7]5−

This chapter focuses on the solid state structural chemistry of actinide materials as determined by single–crystal X–ray diffraction, single–crystal neutron diffraction, powder X–ray diffraction, and powder neutron diffraction techniques. Since Burns’ chapter, Structural Chemistry, was published in the 1986 edition of this work, significant improvements in crystallographic technology and instrumentation have advanced the field of solid state chemistry. Some of the most dramatic changes have been in computer technology and software, making the data collection, reduction, and refinement processes highly automated and simplified. As a consequence, X–ray diffractometers have become nearly ubiquitous in research departments globally and neutron–scattering resources have become more advanced and accessible, resulting in the elucidation and publication of a greater number of additional actinide structures since the last edition; these structures are the focus for this chapter.

Actinide Structural Chemistry

N2H6[Mo2O4(C2O 4)2(H 2O)2]. 4H2O has been prepared by reducing a solution of MoO3 in oxalic acid with N2H6C2O4. Metathesis with tetramethyl ammonium chloride gives [Me4N]2[Mo2O4(c2O4)2(H2O)2].4H2O. The mixed ligand complexes, viz., M4[Mo2O4 (C2O4)2F2] (M = Rb and Cs) have been obtained by crystallising solutions of the hydrazinium compound and the corresponding alkali metal fluoride. All the complexes are very weakly paramagnetic. The i.r. and the electronic spectra show the characteristic features of complexes containing the Mo2O+2 4 moiety.

B.K. Mathur

Papers

Fluoro complexes of hexavalent uranium—V: Fluorooxalato complexes of dioxouranium(VI)