18265-75-3Relevant academic research and scientific papers
Zero-field splitting in {MnIII3(μ3-O)} core single-molecule magnets investigated by inelastic neutron scattering and high-field electron paramagnetic resonance spectroscopy
Sigrist, Marc,Tregenna-Piggott, Philip L.W.,Pedersen, Kasper S.,Sorensen, Mikkel A.,Barra, Anne-Laure,Hauser, Jürg,Liu, Shi-Xia,Decurtins, Silvio,Mutka, Hannu,Bendix, Jesper
, p. 2683 - 2689 (2015/06/22)
The global zero-field splitting (ZFS) parameters of three, ferromagnetically coupled, μ3-κ3-[XO4]- (X = Cl, Re) capped, manganese(III) oximate single-molecule magnets, [Mn3O(R-sao)3(2,4′-bipyridine)3XO4] [X = Cl, R = Me, Et; X = Re, R = Me; Me-sao = 2-hydroxyphenylethanone oximate(2-)], with crystallographic trigonal symmetry were determined by use of inelastic neutron scattering and high-field/high-frequency electron paramagnetic resonance spectroscopy. ReO4- (O...O ca. 1.7 ?) is larger than ClO4- (O...O ca. 1.4 ?), which allows more parallel alignment of the local ZFS tensors. However, this chemical modification results in concomitant distortions in the equatorial ligand plane. Consistent parametrization of all spectroscopic data was achieved, and effective spin-reversal barriers determined from alternating current susceptibility data were shown to be in good accordance with the energy barriers deduced from spectroscopy.
From antiferromagnetic to ferromagnetic exchange in a family of oxime-based MnIII dimers: A magneto-structural study
Barros, Wdeson P.,Inglis, Ross,Nichol, Gary S.,Rajeshkumar, Thayalan,Rajaraman, Gopalan,Piligkos, Stergios,Stumpf, Humberto O.,Brechin, Euan K.
, p. 16510 - 16517 (2013/12/04)
The reaction of Mn(ClO4)2·6H2O, a derivatised phenolic oxime (R-saoH2) and the ligand tris(2-pyridylmethyl)amine (tpa) in a basic alcoholic solution leads to the formation of a family of cluster compounds of general formula [Mn III2O(R-sao)(tpa)2](ClO4) 2 (1, R = H; 2, R = Me; 3, R = Et; 4, R = Ph). The structure is that of a simple, albeit asymmetric, dimer of two MnIII ions bridged through one μ-O2- ion and the -N-O- moiety of the phenolic oxime. Magnetometry reveals that the exchange interaction between the two Mn III ions in complexes 1, 3 and 4 is antiferromagnetic, but that for complex 2 is ferromagnetic. A theoretically developed magneto-structural correlation reveals that the dominant structural parameter influencing the sign and magnitude of the pairwise interaction is the dihedral Mn-O-N-Mn (torsion) angle. A linear correlation is found, with the magnitude of J varying significantly as the dihedral angle is altered. As the torsion angle increases the AF exchange decreases, matching the experimentally determined data. DFT calculations reveal that the dyzπ*dyz interaction decreases as the dihedral angle increases leading to ferromagnetic coupling at larger angles.
Synthesis of 1,2-benzisoxazole 2-oxides
Kociolek, Martin G.,Hoermann, Olivia
body text, p. 2632 - 2638 (2012/08/08)
(Chemical Equation Presented) A series of 2-hydroxyaryl ketoximes were converted to the corresponding 1,2- benzisoxazole 2-oxides by treatment with iodobenzene diacetate (in acetic acid or methanol) or N-chlorosuccinimide in water. Both methods gave moderate to excellent yields for a variety of substituted oximes under mild conditions within short reaction times. The latter method has the advantages of an aqueous solvent and lack of halogenated organic by-products. Copyright Taylor & Francis Group, LLC.
EPR and electronic spectral studies on copper(II) complexes of some N-O donor ligands
Chandra, Sulekh,Sangeetika
, p. 203 - 206 (2007/10/03)
Complexes, [Cu(ligand-H)2] of copper(II) with hidentate nitrogen-oxygen donor ligands, viz. 2-hydroxynaphthaldehydeoxime[hnoH 2], 2-hydroxyacetophenoneoxime [haOH2], salicyladoxime [salH2] and 2-hydroxypropiophenoneoxime [hmpH2] hate been prepared. The complexes have square-planar geometry. The effect of axial ligand has also been studied by EPR spectra of the pyridine adduct of these complexes. Spectral features for diadducts are different compared to the monoadducts. All these pyridine adducts have tetragonal geometry.
1,2-Benzisoxazole Phosphorodiamidates as Novel Anticancer Prodrugs Requiring Bioreductive Activation
Jain, Monish,Kwon, Chul-Hoon
, p. 5428 - 5436 (2007/10/03)
Several 1,2-benzisoxazole phosphorodiamidates have been designed as prodrugs of phosphoramide mustard requiring bioreductive activation. Enzymatic reduction of 1,2-benziosoxazole moiety is expected to result in the formation of imine intermediate due to t
Moessbauer and electronic spectral studies of iron(III) complexes of oximes.
Chandra, Sulekh,Sangeetika,Sharma, Sunil Dutta
, p. 755 - 760 (2007/10/03)
The hydroxo-bridge complexes of the type [Fe(2)(ligand-H)(4)(OH)(2)] with bidentate nitrogen-oxygen donor ligands, viz. 2-hydroxynaphthaldehydeoxime [hnoH(2)], 2-hydroxyacetphenoneoxime [haoH(2)], salicylaldooxime [SalH(2)], 2-hydroxypropiophenoneoxime [hnoH(2)] have been prepared. All the complexes have been characterized by elemental analysis, magnetic moments, electronic and Moessbauer spectral studies. Moessbauer parameters of the complexes clearly suggest high spin configuration of Fe(III) showing lower magnetic moment to that of the spin only value, i.e. 5.92 BM. It may be due to the antiferromagnetic interaction between Fe(III) centers.
