Synthesis and the Crystal Structure
of Aqua-Dioxo-Nitrato-(2,2',6',2''-Terpyridine)-Neptunium(V)
[NpO₂(NO₃)(Terpy)(H₂O)]

N. A. Budantseva*, G. B. Andreev*, A. M. Fedoseev*,
M. Yu. Antipin**, and J.-C. Krupa***

* Institute of Physical Chemistry, Russian Academy of Sciences,
Leninski pr. 31, Moscow, 119991 Russia

e-mail: budants@ipc.rssi.ru

** Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences,
ul. Vavilova 28, Moscow, 119991 Russia

*** Institut de Physique Nucléaire, CNRS-IN2P3, 91406 Orsay Cedex, France

Received April 1, 2002

Abstract—The crystal structure of the [NpO₂(NO₃)(Terpy)(H₂O)] complex between pentavalent neptunium
and 2,2',6',2''-terpyridine is determined. The crystal data are as follows: a = 11.130(3) Å, b = 7.916(2) Å, c =
18.324(5) Å, = 100.873(6), V = 1585.5(8) ų , Z = 4, space group is P2₁/n, R = 0.044, and wR(F²) = 0.092.
The coordination polyhedron of the Np atom is a pentagonal bipyramid whose equatorial plane includes three
nitrogen atoms of the Terpy molecule and two oxygen atoms of the nitrate ion and the water molecule. © 2003
MAIK “Nauka/Interperiodica”.

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