Synthesis and crystal structure of bis-[(1E,6E)-1,7-bis-(4-acet-yloxy-3-meth-oxy-phen-yl)hepta-1,6-diene-3,5-dionato(1-)-κ2 O,O'](methanol)dioxidouranium(VI) toluene monosolvate.

The first uranium-curcuminoid coordination compound has been synthesized and structurally characterized. The title complex, [U(O)2(C25H23O8)2(CH3OH)]·C6H5CH3, crystallizes in the monoclinic space group C2/c. The neutral complex comprises a uran-yl(VI) unit ({O=U=O}2+) coordinated by two monoanionic bidentate 4,4'-di-acetyl-curcuminato ligands (C25H23O8) and one methanol co-ligand, resulting in a distorted penta-gonal-bipyramidal coordination geometry. The O atoms from the β-diketonate moieties and the methanol mol-ecule form the equatorial plane, while the uranyl O atoms occupy the axial positions. In the crystal, O-H⋯O hydrogen bonds generate R 2 2(26) ring motifs, forming zigzag chains along the a-axis direction. Additional weak C-H⋯O inter-actions further consolidate the crystal packing through inter-chain aggregation.