Pentakis(carbamide)dioxoneptunium(V) Nitrate [NpO2{OC(NH2)2}5](NO3): Synthesis,Crystal Structure,and Some Properties |
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| Authors: | Budantseva N A Andreev G B Krot N N Antipin M Yu |
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| Institution: | (1) Institute of Physical Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991, Russia;(2) Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, ul. Vavilova 28, Moscow, 119991, Russia |
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| Abstract: | X-ray diffraction and spectroscopic data for a new Np(V) compound, namely, NpO2{OC(NH2)2}5](NO3) (I) are presented. Crystals are monoclinic, space group P21, a = 11.142(2) Å, b = 7.6379(9) Å, c = 11.143(2) Å,  = 108.9(1)°, Z = 2, V = 897.1(2) Å3. The neptunium atom has a typical pentagonal-bipyramidal environment with five oxygen atoms of the carbamide molecules in the equatorial plane. The nitrate ion is in the outer sphere. Carbamide is a strong molecular ligand with respect to Np(V) and hence, cation–cation bonds of the NpO2
+ ions are not realized in structure I. The wave length of the f–f transition in the electronic absorption spectra of crystalline complex I and Np(V) in a saturated carbamide solution is virtually the same and is equal to 991 nm. |
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