Nature of the dioxobis(tropolonato)uranium(VI) system and its complexes with neutral ligands. Crystal and molecular structure of dioxo(pyridine)bis(tropolonato)uranium(VI)
- 1 January 1974
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 18,p. 1933-1939
- https://doi.org/10.1039/dt9740001933
Abstract
Uranyi tropolonato-complexes, of general formula UO2t2 and UO2t2,xH2O (Ht = tropolone) have been prepared. Physical properties are discussed and structures suggested. Their reactivities were tested by preparing adducts with a series of neutral ligands L (L = methanol, water, dimethyl sulphoxide, pyridine N-oxide, triphenylphosphine oxide, cyclohexanone, pyridine, and aniline). The crystal structure of the pyridine (py) adduct UO2t2(py) has been determined by X-ray diffraction methods by the heavy-atom method from counter data on 3252 reflections, and refined to R 0·058 by a full-matrix least-squares procedure. The monoclinic unit cell, space group I2/a(standard cell C2/c), has dimensions a= 17·88(1), b= 12·69(1), c= 16·79(1)Å, β= 98·32(10)° for Z= 8. The molecule has approximately C2v symmetry. Two tropolonato-groups and the pyridine ligand are displaced slightly from the plane perpendicular to the linear uranyl group. The U–O(uranyl) distances are 1·78 and 1·79 Å; the four U–O(eq) distances are almost equal (2·37–2·38 Å) and U–N(py) is 2·61 Å.Keywords
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