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Phenacylidenetriphenylphosphorane reacts with HgI2 in 2 : 3 molar ratio to form a novel trinuclear iodobridged symmetrical complex whose structure has been elucidated by IR, multinuclear NMR, and X-ray crystallography. The Hg···Hg distance [3.648(1) Å] indicates a negligible bonding interaction between the mercury atoms.

Key indicatorsSingle-crystal X-ray study T = 120 K Mean '(C±C) = 0.003 A Ê R factor = 0.026 wR factor = 0.057 Data-to-parameter ratio = 16.2 For details of how these key indicators were automatically derived from the article, see

A 1 : 1 chelate complex [(C 6 H 5 ) 3 PC(COCH 3 )(COC 6 H 5 )-O,O 0 ]UO 2 (NO 3 ) 2 has been synthesized by reaction of (C 6 H 5 ) 3 PC(COCH 3 )(COC 6 H 5 ) with UO 2 (NO 3 ) 2 Á 6H 2 O in methanol at room temperature and characterized by elemental analysis, spectroscopy as well as by single-crystal X-ray diffraction. The complex crystallizes in P2 1 /n space group with a ¼ 10.007(2) Å , b ¼ 15.285(7) Å , c ¼ 19.20(1) Å , ¼ 91.22(3) , V ¼ 2936(2) Å 3 , Z ¼ 4, D c ¼ 1.847 g cm À3 . In the solid state structure, the dihedral angle [88.1(4) ] between the planes defined by the two quartets of atoms O1 O8 O2 O4 and O6 O5 O3 O7 is close to 90 , as expected for a triangulated dodecahedral geometry around uranium.