Bidentate coordination of a diketo phosphorus ylide: synthesis and structure of [(C₆H₅)₃PC(COCH₃)(COC₆H₅)-κO,O′]UO₂(NO₃)₂

Abstract

A 1 : 1 chelate complex [(C₆H₅)₃PC(COCH₃)(COC₆H₅)-κO,O′]UO₂(NO₃)₂ has been synthesized by reaction of (C₆H₅)₃PC(COCH₃)(COC₆H₅) with UO₂(NO₃)₂ · 6H₂O in methanol at room temperature and characterized by elemental analysis, spectroscopy as well as by single-crystal X-ray diffraction. The complex crystallizes in P2₁/n space group with a = 10.007(2) Å, b = 15.285(7) Å, c = 19.20(1) Å, β = 91.22(3)°, V = 2936(2) ų, Z = 4, D _c = 1.847 g cm⁻³. In the solid state structure, the dihedral angle [88.1(4)°] between the planes defined by the two quartets of atoms O1 O8 O2 O4 and O6 O5 O3 O7 is close to 90°, as expected for a triangulated dodecahedral geometry around uranium.

Keywords:

• Uranyl-phosphoylide complex
• Resonance stabilization
• Diketo ylide

Acknowledgements

KP thanks Department of Science and Technology, New Delhi, India for financial support (SERC-SR/S1/IC-29/2003).