A5008474889- Magnetism in coordination complexes
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Organic and Molecular Conductors Research
- Metal-Organic Frameworks: Synthesis and Applications
- Physics of Superconductivity and Magnetism
- Advanced Condensed Matter Physics
- Lanthanide and Transition Metal Complexes
- Inorganic Fluorides and Related Compounds
- Advanced NMR Techniques and Applications
- Inorganic Chemistry and Materials
- Crystallography and molecular interactions
- Metal complexes synthesis and properties
- Theoretical and Computational Physics
- Crystal Structures and Properties
- Magnetic properties of thin films
- Porphyrin and Phthalocyanine Chemistry
- Quantum and electron transport phenomena
- Electron Spin Resonance Studies
- Fluorine in Organic Chemistry
- Magnetic and transport properties of perovskites and related materials
- Catalysis and Oxidation Reactions
- Solid-state spectroscopy and crystallography
- Crystal structures of chemical compounds
- Advanced MRI Techniques and Applications
Eastern Washington University
2016-2025
Newcastle University
2022
Washington State University
2019-2021
NIST Center for Neutron Research
1998-2017
National Institute of Standards and Technology
1998-2017
University of Bern
2016
East–West University
2011
Synthetic Biologics (United States)
2011
Kyoto University
2011
Argonne National Laboratory
2001-2010
Magnets synthesized from molecules have contributed to the renaissance in study of magnetic materials. Three-dimensional network solids exhibiting ordering been made several first-row metal ions and bridging unsaturated cyanide, tricyanomethanide, and/or dicyanamide ligands. These materials possess different structural motifs, shorter bridge, stronger interaction (i.e., -Ctriple bondN- > -Ntriple bondC-N- >> Ntriple bondC-N-Ctriple = bondC-C-Ctriple bondN-). Cyanide additionally has ability...
Two ambient-temperature molecule-based magnets (Curie temperatures Tc of ∼350 K and 372 K) are presented, which the result research to identify factors in synthesis that control magnetic properties compounds. The goal is increase Tc. two hexacyanochromate described (see also cover this issue) reasons for differences between them earlier (Tc ∼ 315 discussed. High Curie temperature materials may find applications shielding memory storage devices, example.
The reaction of [MII(OH2)6](NO3)2 (M = Co, Ni) and [N(CN)2]- leads to formation isomorphous M[N(CN)2]2 [M Co (2a), Ni (3)], respectively, while the [CoII(OH2)6](NO3)2 in 1% pyridine (py) solution with Co[N(CN)2]2py2. structure 2a, α-Co[N(CN)2]2, was determined from Rietveld analyses both powder X-ray (synchrotron) neutron as well single-crystal diffraction data, whereas 3 analysis data. 2a (pink) (light blue) belong orthorhombic space group Pnnm Z 2 [2a (single crystal): a 5.9985(15), b...
The supramolecular chemistry and crystal structures of five bis(imidazolium 2,6-pyridinedicarboxylate)M(II) trihydrate complexes, where M = Mn2+, Co2+, Ni2+, Cu2+, or Zn2+ (1−5, respectively), are reported. These complexes serve as building blocks that self-assemble when crystallized to generate a single, well-defined, predictable structure in the solid state. 2,6-Pyridinedicarboxylate anions imidazolium cations form strong ionic hydrogen bonds dominate packing compounds 1−5 by forming...
The dynamic susceptibility study of photoinduced magnetism in a molecule-based magnet, K1-2xCo1+x[Fe(CN)(6)];yH(2)O (0.2</=x</=0.4,y approximately 5), is reported. Upon excitation with visible light the material has substantial changes linear and nonlinear ac dc magnetization. results demonstrate cooperative freezing magnetic moments absence true long-range order. ground photoexcited states are described within cluster glass model, increase spin concentration leading to shift dynamics longer...
Octahedral M[N(CN)2]2 (M = Cr, Mn) have been prepared and exhibit a spontaneous magnetization below ordering temperatures of 47 16 K, respectively, due to transition weak-ferromagnetic ground state. This is contrast the ferromagnetic observed for octahedral Co, Ni).
Using dc magnetization, ac susceptibility, specific heat, and neutron diffraction, we have studied the magnetic properties of Mn[N(CN)2]2(pyz) (pyz = pyrazine) in detail. The material crystallizes monoclinic space group P2(1)/n with a 7.3248(2), b 16.7369(4), c 8.7905 (2) A, beta 89.596 degrees, V 1077.65(7) A(3), Z 4, as determined by Rietveld refinement powder diffraction data at 1.35 K. 5 K reflect very little variation crystal structure. Interpenetrating ReO3-like networks are formed...
The homoleptic complexes [Ph(4)P](2)[Co[N(CN)(2)](4)] and [Ph(4)P][M[N(CN)(2)](3)] [M = Co, Mn] have been structurally as well magnetically characterized. containing [M[N(CN)(2)](4)](2-) form 1-D chains, which are bridged via a common dicyanamide ligand in [M[N(CN)(2)](3)](-) to 2-D structure. five-atom [NCNCN](-) bridging ligands lead weak magnetic coupling along chain. six (4)T(1g) ground state for Co(II) has an unquenched spin-orbit that is reflected the properties. Long-range ordering...
J. L. Manson, A. M. Arif and S. Miller, Chem. Commun., 1999, 1479 DOI: 10.1039/A903406D
Though long-range magnetic order cannot occur at temperatures T>0 in a perfect two-dimensional (2D) Heisenberg magnet, real quasi-2D materials will invariably possess nonzero inter-plane coupling J⊥ driving the system to elevated temperatures. This process can be studied using quantum Monte Carlo calculations. However, it is difficult test results of these calculations experimentally since for highly anisotropic which in-plane comparable with attainable fields necessarily very small and...
Co2([N(CN)2]4bpym).H2O (1) and M([N(CN)2]2bpym).H2O [M = Mn (2a), Fe (2b), Co (2c); bpym 2,2'-bipyrimidine] have been synthesized characterized structurally magnetically. All of the compounds crystallize in orthorhombic space group Pnma. The unit cell parameters for 1 are a 16.1684(5) A, b 12.9860(3) c 10.4207(3) Z 4. Compound is 2-D layered structure with water intercalated between sheets. sheets composed ...M-[NCNCN]2-M-bpym-M-[NCNCN]2-M... chains, which linked together by dicyanamides....
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTWeak Ferromagnetism in a Three-Dimensional Manganese(II) Azido Complex, [Mn(4,4'-bipy)(N3)2]n (bipy = Bipyridine)Sujin Han, Jamie L. Manson, Jinkwon Kim, and Joel S. MillerView Author Information Department of Chemistry, Kongju National University, 182 Shinkwan, Chungnam 314-701, Korea, University Utah, 315 South 1400 East RM 2124, Salt Lake City, Utah 84112-0850 Cite this: Inorg. Chem. 2000, 39, 18, 4182–4185Publication Date (Web):August 15,...
Mn[N(CN)2]2(pyz) (pyz = pyrazine) orders antiferromagnetically at low temperature and possesses intralayer µ-NCNCN interlayer µ-pyz ligands that form a pseudo-ReO3 interpenetrating network structure.
The crystallographic and magnetic properties of the $\mathrm{Mn}[\mathrm{N}(\mathrm{CN}{)}_{2}{]}_{2}$ compound have been investigated by dc magnetization, ac susceptibility, specific heat, zero-field neutron diffraction on polycrystalline samples. structure consists two sublattices which are antiferromagnetically coupled spontaneously canted. spin orientation is mainly along a axis with small uncompensated moment b axis. ground state crystal-field sextet large anisotropy. crystal discrete...
Tetraalkylammonium cations, (NR4)+ (R = C3H7, C4H9, and C5H11), have been used as templates to form a new family of [M(dca)3]- [M Mn Ni; dca dicyanamide or N(CN)2-] salts. The tetrapropylammonium (TPrA) salts possess perovskite-type anion structure. (TPrA)[Mn(dca)3] (1) crystallizes in the tetragonal space group P4̄21c, with 16.2945(8) Å, c 17.4321(8) V 4628.4(6) Å3 at T 298 K. At room temperature, (TPrA)[Ni(dca)3] (2) orthorhombic Pnna, 17.171(2) b 22.992(2) 22.750(2) 8981(2) Å3, but...
We present evidence of magnetic order in the quasi-one-dimensional spin-1/2 molecular chain compound, copper pyrazine dinitrate $\mathrm{Cu}({\mathrm{C}}_{4}{\mathrm{H}}_{4}{\mathrm{N}}_{2}){(\mathrm{N}{\mathrm{O}}_{3})}_{2}$. Zero field muon-spin relaxation measurements made at dilution refrigerator temperatures show oscillations measured asymmetry characteristic a quasistatic muon sites. Our provide convincing for long-range below temperature...
Three Cu(2+)-containing coordination polymers were synthesized and characterized by experimental (X-ray diffraction, magnetic susceptibility, pulsed-field magnetization, heat capacity, muon-spin relaxation) electronic structure studies (quantum Monte Carlo simulations density functional theory calculations). [Cu(HF(2))(pyz)(2)]SbF(6) (pyz = pyrazine) (1a), [Cu(2)F(HF)(HF(2))(pyz)(4)](SbF(6))(2) (1b), [CuAg(H(3)F(4))(pyz)(5)](SbF(6))(2) (2) crystallize in either tetragonal or orthorhombic...
Three-dimensional coordination network solids of MII[C(CN)3]2 (M = V, Cr) composition possess interpenetrating rutile-like structures. Each [C(CN)3]- bonds to three different metal ions in a triangular array, affording geometrical topology akin Kagomé lattice leading competing spin exchange interactions and frustration. The crystal magnetic structure CrII[C(CN)3] was determined by Rietveld refinement the powder neutron diffraction data at 2 15 K belongs orthorhombic space group Pmna [a...
ADVERTISEMENT RETURN TO ISSUECommunicationNEXTBuckled-layered Structure of Zinc Dicyanamide, ZnII[N(CN)2]2Jamie L. Manson, Do W. Lee, Arnold Rheingold, and Joel S. MillerView Author Information Department Chemistry, University Utah, 315 1400 E. RM Dock, Salt Lake City, Utah 84112-085, Delaware, Newark, Delaware 19716 Cite this: Inorg. Chem. 1998, 37, 23, 5966–5967Publication Date (Web):October 29, 1998Publication History Received11 June 1998Published online29 October inissue 1 November...
Low-field dc magnetization measurements have been performed on powder samples of the weak ferromagnet Mn[N(CN)2]2. In small fields, H (0.01 ≤ 100 Oe), zero-field and field-cooled magnetizations display onset a spontaneous moment below Tc = 15.85(3) K, giving values which suggest spin-canted moment. A critical exponent, β, equal to 0.380(5) was obtained from fit very low field remanent data power law. As is increased, continuously diminishes with respect total behavior typical an...
The structural, electronic, and magnetic properties of the new linear chain coordination polymer CuF2(H2O)2(pyz) (pyz = pyrazine) were determined by single crystal X-ray diffraction at various temperatures, SQUID magnetometry, pulsed-field magnetization, ESR, muon-spin relaxation (μSR), electronic structure calculations. Each Cu2+ ion is located a distorted CuF2O2N2 octahedron with axial elongation along Cu−N bonds. These octahedra are tethered together strong F···H−O hydrogen bonds to yield...
Successive reorientations of the Jahn–Teller axes associated with CuII ions accompany a series pronounced structural transitions in title compound, as is shown by X-ray crystallography and high-frequency EPR measurements. The second transition forces dimerization involving two thirds sites due to ejection one water molecules from coordination sphere.
Gaining control of the building blocks magnetic materials and thereby achieving particular characteristics will make possible design growth bespoke devices. While progress in synthesis molecular materials, especially coordination polymers, represents a significant step towards this goal, ability to tune interactions within framework remains its infancy. Here we demonstrate chemical method which achieves dimensionality selection via preferential inhibition exchange an $S=1/2$ antiferromagnet...
The accurate electron density distribution and magnetic properties of two metal-organic polymeric magnets, the quasi-one-dimensional (1D) Cu(pyz)(NO3)2 quasi-two-dimensional (2D) [Cu(pyz)2(NO3)]NO3·H2O, have been investigated by high-resolution single-crystal X-ray diffraction functional theory calculations on whole periodic systems selected fragments. Topological analyses, based quantum atoms in molecules, enabled characterization possible exchange pathways establishment relationships...