Dysprosium carbonates

Roesky introduced bis(iminophosphorano)methanides to rare earth chemistry with a comprehensive study of trivalent rare earth bis(imino-phosphorano)methanide dichlorides by the synthesis of samarium (51), dysprosium (52), erbium (53), ytterbium (54), lutetium (55), and yttrium (56) derivatives.37 Complexes 51-56 were prepared from the corresponding anhydrous rare earth trichlorides and 7 in THF and 51 and 56 were further derivatised with two equivalents of potassium diphenylamide to produce 57 and 58, respectively.37 Additionally, treatment of 51, 53, and 56 with two equivalents of sodium cyclopentadienyl resulted in the formation of the bis(cyclopentadienly) derivatives 59-61.38 In 51-61 a metal-methanide bond was observed in the solid state, and for 56 this was shown to persist in solution by 13C NMR spectroscopy (8Ch 17.6 ppm, JYc = 3.6 2/py = 89.1 Hz). However, for 61 the NMR data suggested the yttrium-carbon bond was lost in solution. DFT calculations supported the presence of an yttrium-methanide contact in 56 with a calculated shared electron number (SEN) of 0.40 for the yttrium-carbon bond in a monomeric gas phase model of 56 for comparison, the yttrium-nitrogen bond SEN was calculated to be 0.41. 

The lutetium hahdes (except the fluoride), together with the nitrates, perchlorates, and acetates, are soluble in water. The hydroxide oxide, carbonate, oxalate, and phosphate compotmds are insoluble. Lutetium compounds are all colorless in the solid state and in solution. Due to its closed electronic configuration (4f " ), lutetium has no absorption bands and does not emit radiation. For these reasons it does not have any magnetic or optical importance, see also Cerium Dysprosium Erbium Europium Gadolinium Holmium Lanthanum Neodymium Praseodymium Promethium Samarium Terbium Ytterbium. 

The structure of the Y-B-C phase (Bauer and Nowotny 1971) consists of the B-B zigzag chains with C-branches and trigonal metal prisms, which is similar to that of the phases U-B-C (Toth et al. 1961) and MojBC (Jeitschko et al. 1963). Later work by Bauer and Debuigne (1972, 1975) also found phases with this type of structure in the R-B-C (R = Dy, Gd, Tb) systems. The Dy-B-C phase has lattice parameters a = 3.384 A, fe = 13.727 A and c = 3.647 A. The positions of atoms in the Djh-Cmmm space groups are four dysprosium atoms at 4i sites, y = 0.135 four boron atoms at 4j sites, y = 0.711 and four carbon atoms at 4j sites, y = 0.591. 

The lattice parameter of the compounds R3 MC in the lanthanide series for a given element M changes linearly with the radius of the trivalent rare earth ions, following the lanthanide contraction regularity, except for europium and ytterbium which appear to have a variable-valence state. In the ytterbium-M (Al, Ga, In, Tl)-carbon system, the unit cell volume of the compound YbgMC, is larger than the value expected from the relationship mentioned above. In the europium-M(Al, Ga, In, Tl)-carbon system no compound was found. For the compounds of yttrium, as expected, the lattice parameter falls between those of the respective terbium and dysprosium compounds. 

An intramolecular aza-Piancatelli rearrangement that constructs a fully substituted carbon centre bearing a nitrogen atom and a spirocyclic ring system in a single operation has been catalysed by dysprosium (Ill)triflate. The azaspirocycles are formed exclusively as the irons diastereomer, consistent with a electrocyclization (Scheme 99). ... 

P. Daneshgar, P. Norouzi, A.A. Moosavi-Movahedi, M.R. Ganjali, E. Haghshenas, F. Dousty, M. Farhadi, Fabrication of carbon nanotube and dysprosium nanowire modified electrodes as a sensor for determination of curcumin, J. Appl. Electrochem. 39 (2009) 1983—1992. 

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