Coordination Chemistry of Violurate Complexes

Violurate complexes arise from the deprotonation of violuric acid, a pyrimidine tetrone oxime, which functions as a versatile chelating ligand. The conjugate violurate anion exhibits multiple donor sites, including carbonyl and oxime oxygen atoms, enabling mono-, bi- and polynuclear assemblies with a broad range of transition metals. Coordination modes span monodentate to tridentate binding, often giving rise to square-planar, tetrahedral or distorted octahedral geometries. The inherent planarity of the ligand backbone facilitates π-stacking and hydrogen-bonded networks that stabilise solid-state structures and promote extended frameworks. Recent efforts have explored how subtle variations in pH, solvent and counter-ions tune the coordination environment, modulating redox properties, magnetic interactions and photophysical responses. Applications under investigation include catalytic oxidation, redox-switchable materials and luminescent sensors, reflecting the global interest in designing multifunctional metal–organic architectures derived from simple oxime templates.

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Coordination Chemistry of Violurate Complexes publication trend

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Technical terms

Violuric acid: Organic pyrimidine tetrone oxime that, upon deprotonation, acts as a multidentate ligand.

Ligand: An atom or molecule that donates one or more electron pairs to a central metal ion to form a coordination complex.

Coordination geometry: The spatial arrangement of ligands around a central metal ion.

Bidentate ligand: A ligand that binds to a metal centre through two donor atoms.

Octahedral geometry: A coordination geometry in which six ligands occupy the vertices of an octahedron around the central metal.

References

1. Violuric acid monohydrate: a definitive redetermination at 150 K. Acta Crystallographica Section E: Crystallographic Communications (2005).
2. Hydrogen-bonding and carbon­yl–carbonyl inter­actions in violuric acid methanol solvate. Acta Crystallographica Section C: Structural Chemistry (2005).