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Title: Magnetic Structure and Exchange Interactions in Quasi-One-Dimensional MnCl2(urea)2

Journal Article · · Inorganic Chemistry
 [1];  [2];  [3];  [2];  [4]; ORCiD logo [5];  [6]
  1. Eastern Washington University, Cheney, WA (United States)
  2. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  3. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Delaware, Newark, DE (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. Durham Univ. (United Kingdom)

MnCl2(urea)2 is a new linear chain coordination polymer that exhibits slightly counter-rotated Mn2Cl2 rhomboids along the chain-axis. The material crystallizes in the noncentrosymmetric orthorhombic space group Iba2, with each Mn(II) ion equatorially surrounded by four Cl- that lead to bibridged ribbons. Urea ligands coordinate via O atoms in the axial positions. Hydrogen bonds of the Cl···H–N and O···H–N type link the chains into a quasi-3D network. Magnetic susceptibility data reveal a broad maximum at 9 K that is consistent with short-range magnetic order. Pulsed-field magnetization measurements conducted at 0.6 K show that a fully polarized magnetic state is achieved at Bsat = 19.6 T with another field-induced phase transition occurring at 2.8 T. Zero-field neutron diffraction studies made on a powdered sample of MnCl2(urea)2 reveal that long-range magnetic order occurs below TN = 3.2(1) K. Additional Bragg peaks due to antiferromagnetic (AFM) ordering can be indexed according to the Ib'a2' magnetic space group and propagation vector τ = [0, 0, 0]. Rietveld profile analysis of these data revealed a Néel-type collinear ordering of Mn(II) ions with an ordered magnetic moment of 4.06(6) μB (5 μB is expected for isotropic S = 5/2) oriented along the b-axis, i.e., perpendicular to the chain-axis that runs along the c-direction. Owing to the potential for spatial exchange anisotropy and the pitfalls in modeling bulk magnetic data, we analyzed inelastic neutron scattering data to retrieve the exchange constants: Jc = 2.22 K (intrachain), Ja = -0.10 K (interchain), and D = -0.14 K with J > 0 assigned to AFM coupling. This J configuration is most unusual and contrasts the more commonly observed AFM interchain coupling of 1D chains.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC52-06NA25396; AC05-00OR22725
OSTI ID:
1457261
Alternate ID(s):
OSTI ID: 1528743
Report Number(s):
LA-UR-15-27162
Journal Information:
Inorganic Chemistry, Vol. 54, Issue 24; ISSN 0020-1669
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

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Cited By (8)

Synthesis and Characterization of the New Manganese Hydroxide Chloride γ-Mn(OH)Cl: Synthesis and Characterization of the New Manganese Hydroxide Chloride γ-Mn(OH)Cl journal November 2018
Neutron Instruments for Research in Coordination Chemistry: Neutron Instruments for Research in Coordination Chemistry journal January 2019
Magnetic transitions and isotropic versus anisotropic magnetic behaviour of [CH 3 NH 3 ][M(HCOO) 3 ] M = Mn 2+ , Co 2+ , Ni 2+ , Cu 2+ metal–organic perovskites journal January 2016
Microstructural and optical properties of polyvinyl alcohol/manganese chloride composite film journal October 2018
Probing magnetic interactions in metal–organic frameworks and coordination polymers microscopically journal January 2018
Magnetic field-temperature phase diagram of multiferroic (NH4)2FeCl5·H2O journal August 2019
Quasi-1D chains of dinickel lantern complexes and their magnetic properties journal January 2017
1D Chains of Diruthenium Tetracarbonyl Sawhorse Complexes: 1D Chains of Diruthenium Tetracarbonyl Sawhorse Complexes journal January 2018


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