A5009624277- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Crystallography and molecular interactions
- Advanced Thermoelectric Materials and Devices
- Magnetic and transport properties of perovskites and related materials
- Rare-earth and actinide compounds
- Metal complexes synthesis and properties
- Advanced Condensed Matter Physics
- Inorganic Chemistry and Materials
- Ferroelectric and Piezoelectric Materials
- Organometallic Complex Synthesis and Catalysis
- Electronic and Structural Properties of Oxides
- Chalcogenide Semiconductor Thin Films
- Iron-based superconductors research
- Ferrocene Chemistry and Applications
- Microwave Dielectric Ceramics Synthesis
- Asymmetric Hydrogenation and Catalysis
- Nuclear materials and radiation effects
- Inorganic and Organometallic Chemistry
- 2D Materials and Applications
- Quantum Dots Synthesis And Properties
- Synthesis and biological activity
- Quasicrystal Structures and Properties
- Diagnosis and Treatment of Venous Diseases
- Boron and Carbon Nanomaterials Research
McMaster University
2010-2019
Princeton University
2017-2018
National Institute for Materials Science
2010
Half-sandwich organometallic rhodium and iridium complexes [1–6] have been synthesized with ligands L1 (L1 = Pyridin-2-ylmethylene picolinichydrazine) L2 (L2 Pyridin-3-ylmethylene picolinichydrazine). Treatment of [{Cp∗MCl2}2] (M Rh/Ir) in methanol has yielded mononuclear cationic such as [{Cp∗M(L1N∩N)Cl}]PF6 where {M Rh (1) Ir (2)} dinuclear [{(Cp∗MCl)2(L1N∩N, N∩N)}]PF6 (3) (4)} 1:2 1:1 metal dimer to ligand ratios respectively. Reactions both two metalla-macrocyclic dicationic...
Abstract The bidentate ligand benzoyl(2‐pyridyl)thiourea ( L1 ) was prepared by reaction of benzoyl isothiocyanate with primary amine (2‐aminopyridine) but the secondary bis(2‐pyridyl)amine, yielded unexpected product bis(2‐pyridyl)benzoylamine L2 ). Mononuclear complexes general formula [(η 6 ‐arene)Ru(L)Cl] + {where, L = , arene benzene 1 ); p ‐cymene 2 5 )} and [Cp* M (L)Cl] Rh 3 ), Ir 4 7 8 )}, respectively, were formed ligands precursor ‐arene)Ru( μ ‐Cl)Cl] Rh, Ir). cationic...
${\mathrm{Ba}}_{6\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{Nb}}_{10}{\mathrm{O}}_{30}$ solid solution with $0\ensuremath{\le}$ $x$ $\ensuremath{\le}6$ forms the filled tetragonal tungsten bronze (TTB) structure. The Ba-end member crystallizes in highest symmetry $P4/mbm$ space group $(a=b=12.5842(18)\AA{}$ and $c=3.9995(8)\AA{})$ so do all compositions $\ensuremath{\le}5$. Sr-end of tentatively assigned $Amam$ $(a{}^{*}=17.506(4)\AA{}$, $b{}^{*}=34.932(7)\AA{}$, $c{}^{*}=7.7777(2)\AA{})$....
In the search for high-temperature thermoelectric materials, two families of novel, narrow-band-gap semiconducting antimonide oxides with compositions RE(3)SbO(3) and RE(8)Sb(3-delta)O(8) (RE = La, Sm, Gd, Ho) have been discovered. Their synthesis was motivated by attempts to open a band gap in semimetallic RESb binaries through chemical fusion corresponding insulating RE(2)O(3). Temperatures 1350 degrees C or higher are required obtain these phases. Both adopt new monoclinic structures C2/m...
The Ce-containing analogue of brannerite (ie, UTi2O6) was previously considered to be stoichiometric CeTi2O6); however, it has recently been determined that the material is O deficient. This oxygen-deficient suggested charged balanced by presence a minor concentration Ce3+ or A-site being cation deficient with Ce oxidation state 4+. A variety Ti-containing oxides (including brannerite) have investigated as potential nuclear wasteforms, and necessary understand electronic structure proposed...
Syntheses of europium metal, selenium powder, and the Sb2Se3/Bi2Se3 binaries were observed to produce crystal clusters EuSbSe3 EuBiSe3 phases. These phases crystallize with P212121 space group can be easily identified based on their growth habits, forming large needles. Previous literature suggested that structure is charge-balanced all atoms in divalent state one-quarter trimers. Physical property measurements a pure sample revealed typical Arrhenius-type electrical resistivity, being...
In our efforts to tune the charge transport properties of recently discovered RE3SbO3 phases (RE is a rare earth), we have prepared mixed (REIREII)3SbO3 (REI = La, Ce; REII Dy, Ho) via high-temperature reactions at 1550 °C or greater. contrast monoclinic RE3SbO3, new adopt P42/mnm symmetry but structural framework similar that RE3SbO3. The formation tetragonal driven by ordering large and small RE atoms on different atomic sites. La1.5Dy1.5SbO3, La1.5Ho1.5SbO3, Ce1.5Ho1.5SbO3 samples were...
Abstract A family of rare earth antimonide oxycarbides have been prepared and structurally characterized. These superlattice phases are constructed from NaCl‐type RE Sb slabs sandwiched between –O–C layers. Depending on the carbon content synthetic conditions, three different –Sb–O–C structures can be obtained. At lower temperatures, 9– δ 5 (O,C) obtained for = La, Ho. adopt a stuffed Sc 2 Sb‐type structure with P 4/ nmm symmetry. An O/C mixture, in which ratio is larger than 4:1, randomly...
A tetragonal tungsten bronze (TTB) polymorph of EuTa2O6 was prepared and analyzed. crystallizes in the centrosymmetric Pnam space group (with unit cell: a = 12.3693, b 12.4254, c 7.7228 Å) isomorphous with orthorhombic β-SrTa2O6. In contrast to early reports, we see no evidence deviation from paramagnetic Curie-Weiss behavior among Eu2+ 4f7spins down 2 K. Dielectric constant shows broad peak at ca. 50 K dielectric dispersion resembling diffuse phase transition. The relaxation time, however,...
Through high temperature synthesis at 1300 °C and above, our group has discovered characterized the novel CaRE3SbO4 Ca2RE8Sb3O10 phases (RE = Ce–Nd, Sm–Dy for CaRE3SbO4, RE La–Nd, Ca2RE8Sb3O10). This result was motivated by idea of opening a band gap introducing structural complexity in rare-earth antimonide framework incorporation oxide calcium oxide. The adopt tetragonal I4/m symmetry while ones monoclinic C2/m symmetry. These structures show many similarities to other RE–Sb–O recently,...
The previously unreported RE3Mo14O30 and RE2Mo9O19 phases were synthesized in vacuo from rare-earth oxides, molybdenum oxide, metal using halide fluxes at 875-1000 °C. Both adopt structures the triclinic P1̅ space group albeit with several notable differences. display an ordering of layers along a direction unit cell, forming distinct honeycomb-related lattice arrangements composed MoO6 octahedra vacancies. Mo-Mo bonding clusters are present; structure contains Mo dimers rhomboid tetramers,...
Background: Arene metal complexes with acyl hydrazine derived ligands exhibit serendipitous bonding modes and cytotoxic properties. The aim of this paper is to synthesize arene ruthenium, rhodium iridium N, N’- Bis(picolinoyl)hydrazine ligand which exhibits discrete modes. Structural elucidation the evaluation their in vitro antibacterial antitumor properties are also carried out. Methods: Complexes synthesized characterized by spectroscopic crystallographic studies. electronic explored...
Abstract The compounds LnCuTe 2 (Ln: Gd, Dy, Er) are synthesized from the elements (annealing at 700—800 °C, 100 h) and characterized by single crystal XRD, electrical resistivity Seebeck coefficient measurements, TB‐LMTO‐ASA electronic band structure calculations.
Abstract Crystal clusters of EuSbSe 3 and EuBiSe phases are prepared by solid state reactions a 2:1:3 molar mixture Eu, Sb 2 Se/Bi Se , (C‐coated evacuated silica ampoules, complex heating schedule).