7790-49-0Relevant academic research and scientific papers
C–F Bond Cleavage Reactions with Beryllium, Magnesium, Gallium, Hafnium, and Thorium Halides
Dankert, Fabian,Deubner, H. Lars,Müller, Matthias,Buchner, Magnus R.,Kraus, Florian,von H?nisch, Carsten
, p. 1501 - 1507 (2020)
The work describes unexpected stoichiometric C–F bond cleavage reactions of beryllium, magnesium, gallium, hafnium and thorium halides with α,α,α-trifluorotoluene. The reaction of BeBr2 / GaBr3 or MgBr2 / GaBr3 mixtures as well as neat GaI3 with α,α,α-trifluorotoluene in the presence of (OSi2Me4)2 (I) yields the carbenium ion containing compounds [Ph-C(O2Si2Me4)][GaX4] (X = Br: 1, X = I/F: 2). Both compounds were successfully characterized and a defluorination type reaction under incorporation of a siloxy unit was observed. Compound 1 was also characterized by single-crystal X-ray diffraction analysis. The conversion of α,α,α-trifluorotoluene with BeI2, HfI4 or ThI4 turned out to be a halodefluorination-type reaction with formation of α,α,α-triiodotoluene (3). An adequate NMR spectroscopic and the X-ray crystallographic characterization of 3 were performed for the first time.
The influence of relativistic effects on electronic energy levels in metal tetraiodides MI4 (M = Ti, Zr, Hf, Th)
Green, Jennifer C.,Egdell, Russell G.
, p. 1 - 7 (2015)
The influences of scalar relativistic effects and spin orbit coupling on electronic energy levels in TiI4, ZrI4, HfI4 and ThI4 have been explored by density functional theory. Calculated ionization energies are
A Simple Access to Pure Thorium(IV) Halides (ThCl4, ThBr4, and ThI4)
Deubner, H. Lars,Rudel, Stefan Sebastian,Kraus, Florian
, p. 2005 - 2010 (2017/12/26)
In this work we present a facile, lab scale synthesis for thorium tetrahalides ThX4 (X = Cl, Br, and I). The reaction between the easily available ThO2 and AlX3 (X = Cl, Br, and I) and a subsequent in situ chemical vapor transport (CVT) leads to a product of high purity, which is obtained in the form of crystals or large aggregates of crystals. Their identity and purity was evidenced by X-ray powder diffraction and IR spectroscopy. The usage of ThO2 avoids, unlike earlier syntheses, the utilization of scarcely available thorium metal or of other reactants, such as CCl4, which leads to impurities. Furthermore, the reaction tolerates even less pure ThO2.
Synthesis and characterization of dioxouranium(VI) and thorium(IV) complexes of 2-(2′-hydroxyphenyl)benzirnidazole and 2-(2′-pyridyl)-benzoxazole
Mansingh,Mohanty,Jena,Dash
, p. 479 - 482 (2007/10/03)
The bidentate ligand 2-(2′-hydroxyphenyl)benzimidazole (L).forms mononuclear complexes of the type UO2L2X2 (X=Cl, I, NCS, NO3, CH3COO, 0.5 SO4) and ThL2X4 (X=I, NCS, NO3), whereas the biheterocyclic bidentate ligand 2-(2′-pyridyl)benzoxazole (L′) forms complexes of the type UO2LX2 (X=Cl, NCS, NO3, CH3COO, 0.5 SO4) and ThL2′X4 (X=NCS, NO3). The complexes are characterized by elemental analyses, conductivity and thermogravimetric. measurements and IR as well as 1H and 13C NMR spectral studies.
Dioxouranium(VI) and thorium(IV) complexes of 1-methyl-2,2'-bisimidazole
Mansingh, P. S.,Mohanty, R. R.,Jena, S.,Dash, K.
, p. 639 - 642 (2007/10/03)
The biheterocyclic nitrogen donor ligand 1-methyl-2,2'-bisimidazole (MBIM) reacts with UO2X2 and ThX4 to form mononuclear complexes of the types UO2(MBIM)X2 (X=Cl, I, NCS, NO3, CH3COO, 0.5 SO4) and Th(MBIM)2X4 (X=NO3, I).The complexes are characterised by elemental analyses, conductivity, thermogravimetry and IR, NMR as well as mass spectra.The IR spectra of uranyl complexes exhibit ν(U=0) in the regions 900-925 and 825-860 cm-1 in addition to the vibrational bands of the ligand and those of the polyatomic anions.The 1H NMR spectra of the ligand and the complexes are identical, with the -CH3 group resonating at 3.5 ppm and the NH proton at 3.9 ppm region.The ring protons are observed as multiplets in the region of 7.0 to 8.0 ppm.The mass spectra of the ligand gives molecular ion peak at m/z 148 and other fragmentation products, which are appropriately assigned.However, for the complexes neither the molecular ion peak nor the metallated fragmentation patterns are observed.Thermogravimetry shows the loss of ligands in stages, finally forming the stable metal oxides as the end product.
Synthesis and characterization of complexes of early actinides with tridentate schiff base ligands
Mansingh, Pathani S.,Dash, Kailash C.
, p. 904 - 907 (2007/10/03)
A series or thorium(IV) and dioxouranium(VI) complexes have been synthesised with tridentate schiff base ligands (N2O donor set) obtained by in situ condensation or N,N-dimethylethylenediamine with o-hydroxy aromatic aldehydes such as salicylaldehyde (HL) or o-hydroxy naphthaldehyde (HL').While with dioxouranium(VI), the ligands are coordinated in a neutral manner and act as tridentate donors forming complexes of the type UO2(HL)X2 or UO2(HL')X2 (X=Cl, I, NCS, NO3, CH3COO) with thorium(IV) they are coordinated as deprotonated tridentate ligands yielding complexes of the type Th(L')2X2 (X=I, NCS, NO3).The IR spectra show that the thiocyanate group is actually N-bonded unidentate isothiocyanate and both the nitrate and the acetate groups are bonded in bidentate manner while the ligands are bonded in tridentate manner in these complexes.The PMR spectra confirm the mode of bonding of the ligands either as neutral or as deprotonated species.The thermogravimetric analyses indicate the stability of the complexes.
