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Title: Proton NMR Study in Hexanuclear Manganese Single-Molecule Magnets

Abstract

No abstract prepared.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
928528
Report Number(s):
IS-J 7206
Journal ID: ISSN 1098-0121; TRN: US0803282
DOE Contract Number:
DE-AC02-07CH11358
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 75; Journal Issue: 6
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; MAGNETS; MANGANESE; PROTONS

Citation Formats

M. Belesi, X. Zong, F. Borsa, C.J. Milios, and S. P. Perlepes. Proton NMR Study in Hexanuclear Manganese Single-Molecule Magnets. United States: N. p., 2007. Web. doi:10.1103/PhysRevB.75.064414.
M. Belesi, X. Zong, F. Borsa, C.J. Milios, & S. P. Perlepes. Proton NMR Study in Hexanuclear Manganese Single-Molecule Magnets. United States. doi:10.1103/PhysRevB.75.064414.
M. Belesi, X. Zong, F. Borsa, C.J. Milios, and S. P. Perlepes. Mon . "Proton NMR Study in Hexanuclear Manganese Single-Molecule Magnets". United States. doi:10.1103/PhysRevB.75.064414.
@article{osti_928528,
title = {Proton NMR Study in Hexanuclear Manganese Single-Molecule Magnets},
author = {M. Belesi and X. Zong and F. Borsa and C.J. Milios and S. P. Perlepes},
abstractNote = {No abstract prepared.},
doi = {10.1103/PhysRevB.75.064414},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 6,
volume = 75,
place = {United States},
year = {Mon Feb 12 00:00:00 EST 2007},
month = {Mon Feb 12 00:00:00 EST 2007}
}
  • No abstract prepared.
  • A ternary tetrathiafulvalenium (TTF{sup +}) salt, based on the trivalent, paramagnetic, hexanuclear, all-inorganic niobium cluster anion Nb{sub 6}Cl{sub 18}{sup 3{minus}}, has been prepared by electrocrystallization and characterized by single-crystal x-ray diffraction and diffuse scattering as well as variable-temperature ESR studies. (TTF{sup +}){sub 2{sup {minus}}}((Nb{sub 6}Cl{sub 18}){sup 3{minus}})((C{sub 2}H{sub 5}){sub 4}N{sup +})(CH{sub 3}CN) is insulating, and the tetragonal (space group P4{sub 2}/ncm) lattice parameters at 140 K are a = 17.929 (6), c = 15.798 (3) {angstrom}, and V = 5,079.0 {angstrom}{sup 3}. The structure presents a rock salt framework with the tetrahedral interstices selectively occupied by tetraethylammonium cations and acetonitrilemore » molecules.« less
  • Associations due to hydrogen bonding between chloride ion and trichloromethane or tribromomethane in carbon tetrachloride, acetonitrile, acetone, and N,N-dimethylformamide were investigated by using the /sup 1/H NMR chemical shift and the /sup 35/Cl NMR line width measurements. These measurements were used to obtain the proton shifts of the associated trihalomethanes, the line widths of the associated Cl/sup -/ ions, and the concentration equilibrium constants for associations between trihalomethanes and a Cl/sup -/ ion. The proton shifts of the associated trihalomethanes have a constant value regardless of the character of the solvent, whereas the line widths of the associated Cl/sup -/more » ion show solvent dependence. The magnitude of the line width appears to be related to the dielectric constant of the solvent.« less
  • The preparation and properties of the first strontium-manganese molecular complex are described. The reaction of (NBu{sup n}{sub 4})[Mn402(02CPh)9(H20)] (4Mn{sup III}) with Sr(ClO{sub 4}){sub 2} in MeCN/MeOH led to the isolation of [SrMn{sub 14}O{sub 11}-(OMe)3(02CPh){sub 18}(MeCN)2] (1; 13Mn{sup III}, Mn{sup II}). The structure of 1 consists of two [Mn{sub 4}0{sub 3}(OMe)] cubane units attached to a central, near-planar, trinuclear [Mn{sub 3}O{sub 4}] unit, to which are also attached a Mn and a Sr above the plane and a [Mn{sub 2}O(OMe)] rhomb below the plane. Peripheral ligation is provided by 18 bridging benzoate and two terminal MeCN groups. Variable-temperature and -field dcmore » magnetization (M) data were collected in the 1.8-10 K and 0.1-4.0 T ranges and fit by matrix diagonalization methods to give S = 9/2, D = -0.50(5) cm{sup -1}, and g = 1.88(10), where S is the ground-state spin and D is the axial zero-field splitting parameter. Magnetization versus dc field sweeps at various temperatures and scan rates exhibited hysteresis loops, confirming 1 to be a new single-molecule magnet. Because complex 1 is the initial molecular example of intimately associated Mn and Sr atoms, Sr EXAFS studies have been performed for the first time on a synthetic Sr-containing molecule. This has also allowed comparisons with the EXAFS data on the Sr-substituted water oxidizing complex (WOC) of Photosystem II (PS II), which contains a SrMn{sub 4} complex.« less