A5055304773- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Lanthanide and Transition Metal Complexes
- Radioactive element chemistry and processing
- Metal-Organic Frameworks: Synthesis and Applications
- Organometallic Complex Synthesis and Catalysis
- Crystallography and molecular interactions
- Crystal Structures and Properties
- Metal complexes synthesis and properties
- Crystal structures of chemical compounds
- Magnetism in coordination complexes
- Ferrocene Chemistry and Applications
- Chemical Synthesis and Characterization
- Synthesis and properties of polymers
- Polyoxometalates: Synthesis and Applications
- Organoboron and organosilicon chemistry
- Nuclear Materials and Properties
- Layered Double Hydroxides Synthesis and Applications
- Synthetic Organic Chemistry Methods
- Covalent Organic Framework Applications
- Organoselenium and organotellurium chemistry
- Synthesis and Biological Evaluation
- Inorganic and Organometallic Chemistry
- Inorganic Chemistry and Materials
- Nuclear materials and radiation effects
Angelo State University
2015-2017
University of Louisiana at Monroe
2008-2013
University of Idaho
2001-2007
University of Manitoba
2006
Los Alamos National Laboratory
2004-2005
Covalency in Ln–Cl bonds of Oh-LnCl6x– (x = 3 for Ln CeIII, NdIII, SmIII, EuIII, GdIII; x 2 CeIV) anions has been investigated, primarily using Cl K-edge X-ray absorption spectroscopy (XAS) and time-dependent density functional theory (TDDFT); however, Ce L3,2-edge M5,4-edge XAS were also used to characterize CeCl6x– 2, 3). The spectra modeled configuration interaction calculations. results evaluated as a function (1) the lanthanide (Ln) metal identity, which was varied across series from...
The oxidative dissolution of uranium(IV) dioxide powder at room temperature in aqueous carbonate media has been investigated. Kinetic studies evaluating the efficacy various oxidants, including K2S2O8, NaOCl, and H2O2, for dissolving UO2 alkaline solution have performed, with H2O2 exhibiting most rapid initial 0.1 M oxidant concentrations. This result is due part to ability peroxide act as both an a ligand under conditions. A spectrophotometric titration was used confirm coordination U(VI)...
The trivalent lanthanide bis-hydroxychloride compounds, Ln(OH)(2)Cl, (Ln = Nd through Lu, with the exception of Pm and Sm) have been prepared by hydrothermal synthesis starting LnCl(3).nH(2)O. These compounds were synthesized at temperatures not exceeding melting point Teflon liners in Parr autoclaves ( approximately 220 degrees C). obtained characterized single crystal X-ray diffraction analysis, diffuse reflectance, FT-IR, FT-Raman spectroscopies. Most lanthanide(III) bis-hydroxychlorides...
A series of trivalent lanthanide hydroxysulfates, Ln(OH)SO4, (Ln = Pr through Yb, except radioactive Pm) has been synthesized via hydrothermal methods from Ln2(SO4)3·8H2O by reaction with aqueous NaOH at 170 °C in Teflon lined Parr steel autoclaves, and were characterized single crystal X-ray diffraction FT-IR spectroscopy. Two types arrangements found the solid state. The lighter Pr−Nd, Sm−Gd) heavier lanthanide(III) hydroxysulfates (Tb−Yb) are each isostructural. Both structure exhibit...
ansa-Calcocene compounds are effective reagents for the synthesis of ansa-chromocene complexes from CrCl2 in presence a trapping ligand such as carbon monoxide or an isonitrile. A variety carbonyl and tert-butyl isocyanide have been prepared this manner high yields. The X-ray crystal structure one these complexes, [trans-1,2-(3,4-(CH3O)2C6H3)2C2H2{η5-C5H4}2]CrCO, is described. Electrochemical studies on show that isonitrile derivatives more easily oxidized than derivatives. Preliminary...
A variety of 18e ansa-chromocene isocyanide complexes were prepared via ligand substitution on the carbonyl complexes. The relative π-accepting character different ligands was evaluated from structural, spectroscopic, and electrochemical properties One-electron chemical oxidation generates low-spin, 17e cations, structural spectroscopic which compared with their neutral precursors. Density functional theory (DFT) calculations performed model in order to elucidate nature bonding between...
Using slow diffusion methods at room temperature, five uranium coordination polymers were obtained, which either employ glutarate (Glut), terephthalate (TP), or 2-aminoterephthalate (TPNH2) as bridging systems. Four of these networks are based on the uranyl(VI)-unit, UO22+, and one formed through integration tetravalent coordinating metal center. [[UO2](TP)(H2O)2]·2THF (1) arranges intermeshed one-dimensional (1D) infinite linear chains, locked into a three-dimensional (3D) network hydrogen...
The title compound was obtained by reacting UO2 powder in 2 M K2CO3 with hydrogen peroxide. contains individual [U(CO3)2O2(O2)]4- ions, which are linked via an extended network of K atoms and bonding. U atom is coordinated to two trans-axial O six the equatorial plane, forming distorted hexagonal bipyramids. carbonate ligands bound center a bidentate manner, U-O bond distances ranging from 2.438 (5) 2.488 A. peroxo group forms three-membered ring atom, 2.256 (6) 2.240 U=O 1.806 1.817 A,...
Abstract The first mononuclear molecular mixed-ligand U(VI) solid containing hydroxide and peroxide ligands, Na 6 [UO 2 (O ) (OH) ](OH) ·14H O (I), was synthesized structurally characterized using single crystal X-ray diffraction. structure of I consisted ] 4− units, with a uranyl(VI) moiety perpendicular to equatorial atoms belonging two side-on trans peroxo groups terminal hydroxo groups. Density functional theory (DFT) calculations determined that the -conformer unit found in 24 kcal/mol...
Abstract A detailed study of the thermal decomposition zwitterionic, ring‐borylated ansa ‐chromocene hydrido carbonyl complex [Cr(CO)H{Me 4 C 2 (C 5 H )[C 3 B(C 6 F ) ]}] ( is described. This formed in reaction between [Cr(CO){Me }] 1 and toluene at −78 °C. Above −25 °C, decomposes to a 50:50 mixture low‐spin, 17 e Cr III complexes b }][HB(C ] ). Carbon monoxide elimination from generates high‐spin, 15 [Cr{Me ), which coordinates two other electron‐donating ligands, such as xylyl isocyanide,...
The first thermally robust and air stable bent-sandwich chromocene complex with chromium in the +4 oxidation state has been isolated fully characterized.
The title compound, [Nd2(C5H6O4)2(C8H4O4)(H2O)4]·17H2O, obtained via hydrothermal reaction of Nd2O3 with glutaric acid and terephthalic acid, assembles as a three-dimensional open framework ten-coordinate Nd–O polyhedra. asymmetric part the unit cell contains half glutarate anion, quarter terephthalate dianion, an NdIII cation, one coordinated water molecule 4.25 solvent molecules. Each [NdO10] coordination polyhedron is comprised six O atoms originating from four anions, two others...
The title compound, C(8)H(4)ClNO(2)Te, represents the first reported example of a benzofuran-derived 2,1,3-benzoxatellurazole derivative. While it can be formally described as nitrosoaryltellurium monochloride, its Te-O and Te-C bond lengths 2.1421 (14) 2.0374 (17) Å, respectively, characterize planar tricyclic aromatic containing Te=C double bond. Its formation suggests that derivatives 2-cyclohexenone oxime in general react with tellurium dioxide to form aryl-2,1,3-benzoxatellurazoles.
The title compound, [Yb(C2H3O2)(OH)2]·0.5H2O, was obtained via hydrothermal reaction of Yb(CH3COO)3·H2O with NaOH at 443 K. compound forms two-dimensional layers six crystallographically independent YbIII atoms. Four these form YbO8 coordination polyhedra, while the number remaining two atoms is 7. Five polyhedra are interconnected mainly hydroxide groups, as they build a narrow inner layer that extends infinitely within ab plane. sixth atom resides outside this and builds terminal...
In the title compound, dibromobis(tetrahydrofuran-O)chromium(II), [CrBr2(C4H8O)2], CrBr2 is solvated by two tetrahydrofuran (thf) molecules, with a Cr—O distance of 2.072 (3) Å and Cr—Br 2.5825 (5) Å. The Cr atom lies on center inversion. octahedrally coordinated, thf bond orthogonal to bond, vacant sites are occupied Cr⋯Br intermolecular interaction 2.9874 latter almost vector. This extends system into linear chain along [100] direction.