Bis(flavonolato-κ2O,O′)dioxidoosmium(VI) dichloromethane disolvate

Abstract

In the crystal structure of the title solvated trans-dioxidoosmium(VI) flavonolate (flav) complex, [Os(C15H9O3)2O2]·2CH2Cl2 or [Os(flav)2O2]·2CH2Cl2, the two dichloromethane solvent molecules have nonclassical hydrogen-bonding contacts at or greater than 3.18 Å. The pseudo-octahedrally coordinated central metal cation is observed with all donor atoms being oxygen. The Os=O bond lengths are 1.721 (5) and 1.728 (5) Å, with a 170.4 (2)° bond angle. The O—Os bond lengths arising from the flanvonolate ligand are observed to all be slightly over 2.0 Å. The chelate bond angles arising from the flavonolate O atoms with the osmium cation are constrained by the ligand at 80.72 (18) and 80.92 (17)°.

Keywords

• crystal structure
• osmium
• 3-hydroxyflavone
• quercetin dioxygenase