Abstract
A new complex of Np(V) [NpO2(HCOO){OC(NH2)2}3] (I) was synthesized and its crystal structure was determined: a = 6.674(1) A, b = 13.164(2) A, c = 7.020(1) A, β = 101.35(1)°, space group P21, Z = 2, V = 604.7(2) A3, R = 0.048, wR(F 2) = 0.128. The structure consists of infinite chains of [NpO2(HCOO){OC(NH2)2}3]∞. The coordination polyhedron of the Np atom is a pentagonal bipyramid with the O atoms of three carbamide molecules and two formate ions in the equatorial plane. The absorption spectra were measured in IR and near-IR regions for compound I and for the [NpO2Cl{OC(NH2)2}4] complex, whose structure was reported in the previous publication.
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