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A survey of the Cambridge Structural Database (CSD) revealed the existence of a new supramolecular homosynthon in oxovanadium coordination compounds (OCCs) that is based on non-covalent V=O…C interactions. V=O…C close contacts were found in 38.7% of structures containing vanadyl or pervanadyl groups. The V=O…C interaction is clearly distinguishable from a putative V=O…H–C hydrogen bond upon analysis of OCC crystal structures deposited in the CSD. In the majority of structures, the OCCs assemble to form dimers or polymers. The V=O…C interactions were also found to lead to self-assembly of two new oxovanadium β-diketonate complexes into dimers in the solid state. [ABSTRACT FROM AUTHOR]

Tetrakis(benzoylacetonato)cerium(IV), [Ce(bzac)4] and triethylammonium tetrakis(benzoylacetonato)lanthanate(III) tetrahydrate, [Et3NH][La(bzac)4] · 4H2O were prepared and characterized by TG and DCS measurements, IR spectroscopy, and X-ray structure analysis. The coordination polyhedron of cerium is a trigonal dodecahedron, while that of lanthanum is a distorted square antiprism. Thermal and spectroscopic measurements indicate that bonding of the ligand to metal is stronger in [Ce(bzac)4] than in [La(bzac)4]-. [ABSTRACT FROM AUTHOR]