A new phase of Cd(py) 4 NbOF 5 (py) pyridine) (A) is a rare example of a mixed metal oxide fluoride in an ordered linear chain structure. This phase is of particular interest because it is a polymorph of a previously reported Cd(py) 4 NbOF 5 phase (B) that crystallizes in disordered linear chains. The ordered polymorph A contains two distinct Cd 2+ sites: one which is coordinated to the oxide ligands from two [NbOF 5 ] 2units, and another that is coordinated to two trans fluoride ligands. As a result, the structure of polymorph A features nonpolar linear chains with locally ordered [NbOF 5 ] 2anions. This ordering is explained in terms of the inherent electronic differences between oxide and fluoride ligands. The stabilization provided by π-stacking interactions between pyridine ligands on neighboring chains, as well as the effects of reactant stoichiometry on the general structure of the products in the CdO‚1/2Nb 2 O 5 /(HF) x ‚py/H 2 O system, is also discussed. Crystal data for the ordered Cd(py) 4 NbOF 5 polymorph: monoclinic space group P2 1 /c (No. 14) with a) 14.097(1) Å, b) 16.353(1) Å, c) 10.4380(9) Å,) 95.569(2)°, and Z) 4.

The single-crystal structure of the hydrophobic actinide extractant di(p-tert-butylphenyl)-N,N-di-(isobutyl)carbamoylmethylphosphine oxide (CMPO, 1) has been determined, as has that of its 1 : 1 chelate complex with uranyl nitrate (2), its 1 : 1 monodentate complexes with Ph 3 SnCl (3) and Me 2 SnCl 2 (4) bonding via the P O group. A 1 : 1 bidentate complex with Ph 2 SnCl 2 bonding via both P O and C O functionalities (5) was obtained which in solution exhibits a C O → Sn bond dissociation to exist as the monodentate isomer coordinating only through the P O group.

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Organo-phosphorus compoundsOrgano-phosphorus compounds S 0080 High-Yield, One-Pot Syntheses of Symmetrical Diaryl-N,N-dialkyl Carbamoylmethylphosphine Oxide (CMPO) Ligands. -A simple one-pot process is reported for the synthesis of title compounds (III) useful as actinoid extractants. -(GUILLORY, P.; KAPOOR, R. N.; PANNELL*, K. H.; SCHULTE, L.; MCKEE, S. D.; ZHANG, Z.-Y.; BARTSCH, R. C.; Synth. Commun. 33 (2003) 2, 325-330; Dep. Chem., Univ. Tex., El Paso, TX 79968, USA; Eng.) -H. Haber 22-184