Synthesis, structure, and upconversion studies on organically templated uranium phosphites

Mandal, Sukhendu ; Chandra, Manabendra ; Natarajan, Srinivasan (2007) Synthesis, structure, and upconversion studies on organically templated uranium phosphites Inorganic Chemistry, 46 (19). pp. 7935-7943. ISSN 0020-1669

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Official URL: http://pubs.acs.org/doi/abs/10.1021/ic700866f

Related URL: http://dx.doi.org/10.1021/ic700866f

Abstract

Three new amine templated uranium phosphites, [C2N2H10] [U2IVF6(HPO3)2], 1, [C4N2H12][U2IVF6 (HPO3)2], 2, and [C4N2H12] [(UVIO2)2F2(HPO3)2], 3, have been synthesized by hydrothermal methods. All of the compounds are built up from a connectivity between U(O/F)x (x = 7, 8) and HPO3 polyhedral units. The observation of a well-established secondary building unit, SBU-4, in 1 and 2 is noteworthy. In 1, the SBU-4 units are connected to form U-F-U chains, which are linked by U-O-P chains, forming the layered structure. In 2, the SBU-4 units are edge-shared and also interconnected forming the 3D structure. In 3, the connectivity between the building units forms a layer, the topology of which is similar to the mineral, johannite. To the best of our knowledge, this is the first observation of a well-known secondary building unit (SBU-4) in actinide framework compounds. Optical studies on 1 and 2, containing U4+ species, indicate an intense blue emission through an upconversion process, and the magnetic susceptibility studies show antiferromagnetic behavior.

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