13470-38-7Relevant academic research and scientific papers
Y16I19C8B4 - A yttrium boride carbide halide containing B2C4 units
Oeckler, Oliver,Mattausch, Hansjuergen,Simon, Arndt
, p. 1834 - 1838 (1998)
The new compound Y16I19C8B4 was prepared from Y, YI3, C and B at 1050-1150°C. The structure of a twinned crystal was determined by means of X-ray diffraction (space group P 1, a = 12.311(2) A, b = 13.996(3) A, c = 19.695(3) A, α = 74.96(2)°, β = 89.51(2)°, γ = 67.03(2)°, Z = 2). Y16I19C8B4 is a semiconductor and contains nearly planar B2C4 units which are located in cages built up by 12 yttrium atoms. Assuming (B2C4)12-, these units can be regarded as isoelectronic with B2F4. The yttrium cages are connected via faces to form rods, which are surrounded by iodine atoms. Bridging iodine atoms connect the rods so that layers are formed. The characteristic twinning observed can be understood from the geometry of the crystal structure.
RE2+xI2M2+y (RE = Ce, Gd, Y; M = Al, Ga): Reduced rare earth halides with a hexagonal metal atom network
Lukachuk, Mar'yana,Zheng, Chong,Mattausch, Hansjürgen,Banks, Michael G.,Kremer, Reinhard K.,Simon, Arndt
, p. 633 - 641 (2007)
The title compounds were synthesized from RE, REI3 (RE = Ce, Gd, Y) and Al or Ga under an Ar atmosphere at 930-950 °C. The non-stoichiometric Ce2+xI2Al2+y and Ce 2+xI2Ga2+y compounds crystallize in the space group R3?m (No. 166) with lattice constants a = 4.3645(3), c = 35.914(2) A? for the Al and a = 4.3009(2), c = 35.680(4) A? for the Ga compound. Excess electron density found in the Wyckoff position 3a could be due to a fractional occupation by Ce or M (x = 0.06, y = 0 or x = 0, y = 0.11 in the case of the Ga_compound). The stoichiometric Gd2I2Ga 2 and Y2I2Ga2 compounds crystallize in the space group P3?m1 (No. 164) with lattice constants a = 4.1964(1) and 4.1786(7) A?, c = 11.4753(4) and 11.434(2) A?, respectively. Their structures feature M-centered (M = Al, Ga) RE trigonal prisms condensed via common rectangular faces. The electronic origin of the surplus of metal atoms in the octahedral voids between the I-layers of the Ce compounds was explored via extended Huckel-type calculations. Magnetic susceptibility, electrical resistivity and heat capacity measurements have also been carried out. These reveal a metal-insulator transition of Gd2I2Ga2 at 40 K.
Synthesis and structural characterisation of lanthanide and actinide phosphaorganometallic complexes derived from the 3,5-di-tert-butyl-1,2,4-triphospholyl ring anion, P3C2But-2: Crystal and molecular structures
Clentsmith, Guy K.B.,Cloke, F. Geoffrey N.,Francis, Matthew D.,Hanks, John R.,Hitchcock, Peter B.,Nixon, John F.
, p. 2287 - 2292 (2008)
Full title. Synthesis and structural characterisation of lanthanide and actinide phosphaorganometallic complexes derived from the 3,5-di-tert-butyl-1,2,4-triphospholyl ring anion, P3C2But-2: Crystal and molecula
YIHn: A new family of metal-rich hydride halides
Ryazanov, Mikhail,Simon, Arndt,Mattausch, Hansjuergen
, p. 1401 - 1407 (2004)
The graphite-like yttrium hydride halides, YIHn (0.8 ≤ n ≤ 1.0), have been prepared in quantitative yields by heating either YI 3, YH2 (1:2) or stoichiometric YI3, YH 2, Y mixtures in sealed Ta ampoules at 900°C. A lower limit of the homogeneity range, n ≈ 2/3, has been determined from dehydrogenation experiments. All YIHn phases adopt the ZrBr-type heavy-atom structure. The hydrogen variation is accompanied by a change in the c lattice constant from 31.162(3) to 31.033(1) A for n = 0.61(3) to 1.02(3). The YIHn phases reversibly react with hydrogen at 400-600°C to form the light green transparent compound YIH2. However, increasing the reaction temperature above 700°C causes decomposition to an unidentified phase being in equilibrium with YH2 and YI3. The arrangement of the heavy atoms in YIH2 (P3m1; a = 3.8579(3) A, c = 10.997(1) A) corresponds to a four-layer I-Y-Y-I slab with the stacking sequence (AbaB) as was found by x-ray powder diffraction data refinement with the Rietveld method. A miscibility gap exists between YIH and YIH2. Samples YIHn (n ≤ 1.0) show metallic conductivity at room temperature, which changes into semiconducting behavior with decreasing temperature as n approaches its lower value ≈ 2/3.
RE19(C2)3i34 (RE = Y, Gd): Compounds with discrete RE6I12 clusters and isolated RE atoms
Schaloske, Manuel C.,Kienle, Lorenz,Duppel, Viola,Mattausch, Hansjuergen,Simon, Arndt
, p. 188 - 195 (2010)
The compounds RE19(C2)3I34 (RE = Y, Gd) were prepared from RE, REI3 and carbon in a molar ratio of 20:34:18 by the addition of three parts of REH at 920 °C (Y) and 900 °C (Gd), respectively, forming moisture sensitive, black shiny brittle polyhedra. X-ray single crystal investigations indicated the triclinic system and E value statistics showed P1, a = 9.3683(9) , b = 10.3410(9) A, c = 22.1726(20) A, α = 79.104( 10)°, β = 88.175( 11 )°, γ = 69.227( 10)° for Y19(C2)3I 34 and a = 9.4172(9) A, b = 10.3390(10) A c= 22.3711(24) A, α= 79.001(12)°, β= 88.320(12)°, γ = 69.250(11)° for Gd19(C2)3I34,, respectively. The RE atoms form two sets of different RE6 octahedra centered by C2 groups, which are coordinated by iodine atoms above all edges. In addition one isolated RE position occurs. The refinement served problems because of significant disorder showing up in a 65 % occupation of the isolated RE position and quite significant residual electron densities near the heavy atom positions. Electron diffraction confirmed the ideal structure, however, a detailed analysis via HRTEM showed alternations in the sequence of two kinds of layers.
New layered germanide halides RE2GeX2 (RE = Y, Gd; X = Br, I)
Lukachuk, Mar'yana,Kremer, Reinhard K.,Mattausch, Hansjuergen,Simon, Arndt
, p. 3231 - 3235 (2007)
The title compounds were synthesized from RE, REX3, and Ge under an Ar atmosphere at 1200-1370 K. Y2GeI2 and Gd 2GeI2 crystallize in space group R3m with lattice constants a = 4.2135(3) and 4.2527(1) A and c = 31.480(2) and 31.657(1) A, respectively. Gd2GeBr2 crystallizes in two modifications, the 1T-type (space group P3m1; a = 4.1668(2) A, c = 9.8173(6) A) and the 3R-type (space group R3m; a = 4.1442(9) A, c = 29.487(7) A). The structural motifs of RE2GeX2 compounds are Ge-centered slightly distorted RE6 octahedra connected via their common edges and extending in the a and b directions. The resulting close-packed double layers are separated by halogen atoms. The electrical resistivity measurements revealed semiconductor behavior for Y 2GeI2 and Gd2GeI2 and a metal-semiconductor transition for 1T-Gd2GeBr2. Magnetic susceptibility and heat capacity measurements show long-range magnetic ordering for Gd2GeI2 and 1T-Gd2GeBr2 at ~15 and ~13 K, respectively.
Yttrium complexes incorporating the chelating diamides {ArN(CH 2)xNAr}2- (Ar = C6H 3-2,6-iPr2, x = 2, 3) and their unusual reaction with phenylsilane
Avent, Anthony G.,Cloke, F. Geoffrey N.,Elvidge, Benjamin R.,Hitchcock, Peter B.
, p. 1083 - 1096 (2007/10/03)
Novel yttrium chelating diamide complexes [(Y{ArN(CH2) xNAr}(Z)(THF)n)y,] (Z = I, CH(SiMe 3)2, CH2Ph, H, N(SiMe3)2, OC6H3-2,6-tBu2-4-Me; x = 2, 3; n = 1 or 2; y = 1 or 2) were made via salt metathesis of the potassium diamides (x = 3 (3), x = 2 (4)) and yttrium triiodide in THF (5, 10), followed by salt metathesis with the appropriate potassium salt (6-9, 11-13, 15) and further reaction with molecular hydrogen (14). 6 and 11 (Z = CH(SiMe3) 2, x = 2, 3) underwent unprecedented exchange of yttrium for silicon on reaction with phenylsilane to yield (Si{ArN(CH2) xNAr}PhH) (x = 2 (16), 3) and (Si{CH(SiMe3) 2}PhH2).
On the reactivity of lanthanide iodides LnIx (x < 3) formed in the reactions of lanthanide metals with iodine
Khoroshenkov,Petrovskaya,Fedushkin,Bochkarev
, p. 699 - 702 (2008/10/08)
The reduced lanthanide iodides of the composition LnIx (Ln = Sc, Y, La, Ce, Pr, Gd, Ho, and Er; x 3) were obtained by the reaction of an excess of the appropriate metal with iodine at high temperatures. The diamagnetism of the Sc, Y, and La d
Rare earth iodide complexes of 4-formyl-2,3-dimethyl-1-phenyl-3-pyrazolin-5-one
Joseph, Siby,Radhakrishnan
, p. 1219 - 1229 (2008/10/09)
Rare earth complexes of 4-formyl-2,3-dimethyl-1-phenyl-3-pyrazolin-5-one (FDPP) having the general formula [Ln(FDPP)4I2]I, where Ln = Y, La, Pr, Nd, Sm, Eu, Gd, Dy, Ho and Er, have been synthesised and characterised by elemental analyses, molar conductance in non-aqueous solvents, electronic, infrared and proton NMR spectra as well as thermogravimetric analyses. FDPP acts as a neutral monodentate ligand coordinating through the ring carbonyl oxygen. Two of the iodide ions are coordinated. A coordination number of six may be assigned to the metal ion in these complexes. The covalency parameters evaluated from the solid state electronic spectra suggest weak covalent character of the metal-ligand bond. The TG data of the lanthanum complex indicate that the complex is stable up to about 140° C and undergoes decomposition in three stages forming lanthanum oxide as the final product.
X-ray Diffraction Study of Yttrium Iodide
Astakhova,Goryushkin,Epifantsev
, p. 1713 - 1717 (2008/10/08)
Yttrium iodide YI3 obtained by vapor iodination of yttrium is characterized by X-ray powder diffraction data: hexagonal, a = 12.978(10) ?, c = 20.939(17) ?, pcalcd = 4.596 g/cm3, and Z= 18. The deformation parameters of YI3 characterizing octahedral layer structures are given. The compound is isostructural to LuI3, HoI3, and GdI3and falls into the structural type of BiI3.
