Synthesis and Molecular Structure of a Plutonium(IV) Coordination Complex: [Pu(NO3)2{2,6-[(C6H5)2P(O)CH2]2C5H3NO}2](NO3)2•1.5H2O•0.5MeOH

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Abstract
The trifunctional ligand 2,6-[(C6H5)2P(O)CH2]2 C5H3NO (1), in a mixed EtOH/MeOH solvent system, when combined with an aqueous nitric acid solution of Pu(IV), produces a 2:1 coordination complex, [Pu(1)2(NO3)2](NO3)2. A single crystal of [Pu(NO3)2{2,6-[(C6H5)2P(O)CH2]2C5H3NO}2](NO3)2•1.5H2O•0.5MeOH was characterized by X-ray diffraction analysis. The crystal is monoclinic, space group P21/n, with a = 19.1011(9) Å, b = 18.2873(9) Å, c = 21.507(1) Å, α = γ = 90°, β = 108.64(1)°, and Z = 4. Two neutral ligands (1) are bonded to the Pu(IV) ion in a tridentate fashion. Two nitrate ions also occupy inner sphere coordination positions, while two additional NO3- ions reside in the outer sphere. Comparison of the solution optical absorbance and solid diffuse reflectance spectra shows the same Pu(IV) chromophore exists in both solid and solution states.

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