Structural and magnetic ordering in the two-dimensional coordination polymer Co(ox)(bpy-d8), (ox = C2O4 2-, bpy-d8 = 4,4′-bipyridine-d8)

R. Feyerherm, A. Loose, M. A. Lawandy, Jing Li

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Neutron diffraction and magnetic susceptibility studies of the two-dimensional coordination polymer Co(ox)(bpy-d8) are presented, where ox = C2O4 2- and bpy-d8 = 4,4′-bipyridine-d8 (fully deuterated). The neutron powder diffraction data reveal a second-order crystallographic phase transition at 290 K. Above 290 K, a disordered structure, space group Immm, is observed that is closely related to the ordered structure previously proposed on the basis of single crystal X-ray diffraction. At low temperatures, the structure is an ordered variant of the high-temperature phase with space group I222. In both phases, the Co ions are linked by the oxalate forming infinite chains that are crosslinked by the bpy ligands. The magnetic susceptibility follows qualitatively a quasi one-dimensional chain behavior. It exhibits a broad maximum around 35 K, corresponding to a strong antiferromagnetic coupling through the oxalate bridges. A kink at 9 K marks the onset of long-range antiferromagnetic ordering due to much weaker interchain magnetic interactions. The magnetically ordered structure determined from the low-temperature neutron diffraction data can be described with the propagation vector (1/2, 1/2, 1/2), i.e. a doubling of the unit cell in each principal direction. It is concluded that a significant antiferromagnetic interaction is mediated through the bpy ligands, although the Co-Co distance along these bridges is 11.4 Å.

Original languageEnglish
Pages (from-to)71-77
Number of pages7
JournalJournal of Physics and Chemistry of Solids
Volume63
Issue number1
DOIs
Publication statusPublished - Jan 2001

Fingerprint

coordination polymers
Magnetization
Polymers
Oxalates
oxalates
Neutron diffraction
Magnetic susceptibility
magnetic permeability
neutron diffraction
Ligands
ligands
Neutron powder diffraction
diffraction
Temperature
Phase transitions
Single crystals
interactions
Ions
neutrons
X ray diffraction

Keywords

  • A. Inorganic compounds
  • C. Neutron scattering
  • D. Crystal structure
  • D. Magnetic properties
  • D. Magnetic structure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Structural and magnetic ordering in the two-dimensional coordination polymer Co(ox)(bpy-d8), (ox = C2O4 2-, bpy-d8 = 4,4′-bipyridine-d8). / Feyerherm, R.; Loose, A.; Lawandy, M. A.; Li, Jing.

In: Journal of Physics and Chemistry of Solids, Vol. 63, No. 1, 01.2001, p. 71-77.

Research output: Contribution to journalArticle

@article{8fcd48f7e12f4104a9bda623dd52563d,
title = "Structural and magnetic ordering in the two-dimensional coordination polymer Co(ox)(bpy-d8), (ox = C2O4 2-, bpy-d8 = 4,4′-bipyridine-d8)",
abstract = "Neutron diffraction and magnetic susceptibility studies of the two-dimensional coordination polymer Co(ox)(bpy-d8) are presented, where ox = C2O4 2- and bpy-d8 = 4,4′-bipyridine-d8 (fully deuterated). The neutron powder diffraction data reveal a second-order crystallographic phase transition at 290 K. Above 290 K, a disordered structure, space group Immm, is observed that is closely related to the ordered structure previously proposed on the basis of single crystal X-ray diffraction. At low temperatures, the structure is an ordered variant of the high-temperature phase with space group I222. In both phases, the Co ions are linked by the oxalate forming infinite chains that are crosslinked by the bpy ligands. The magnetic susceptibility follows qualitatively a quasi one-dimensional chain behavior. It exhibits a broad maximum around 35 K, corresponding to a strong antiferromagnetic coupling through the oxalate bridges. A kink at 9 K marks the onset of long-range antiferromagnetic ordering due to much weaker interchain magnetic interactions. The magnetically ordered structure determined from the low-temperature neutron diffraction data can be described with the propagation vector (1/2, 1/2, 1/2), i.e. a doubling of the unit cell in each principal direction. It is concluded that a significant antiferromagnetic interaction is mediated through the bpy ligands, although the Co-Co distance along these bridges is 11.4 {\AA}.",
keywords = "A. Inorganic compounds, C. Neutron scattering, D. Crystal structure, D. Magnetic properties, D. Magnetic structure",
author = "R. Feyerherm and A. Loose and Lawandy, {M. A.} and Jing Li",
year = "2001",
month = "1",
doi = "10.1016/S0022-3697(01)00080-4",
language = "English",
volume = "63",
pages = "71--77",
journal = "Journal of Physics and Chemistry of Solids",
issn = "0022-3697",
publisher = "Elsevier Limited",
number = "1",

}

TY - JOUR

T1 - Structural and magnetic ordering in the two-dimensional coordination polymer Co(ox)(bpy-d8), (ox = C2O4 2-, bpy-d8 = 4,4′-bipyridine-d8)

AU - Feyerherm, R.

AU - Loose, A.

AU - Lawandy, M. A.

AU - Li, Jing

PY - 2001/1

Y1 - 2001/1

N2 - Neutron diffraction and magnetic susceptibility studies of the two-dimensional coordination polymer Co(ox)(bpy-d8) are presented, where ox = C2O4 2- and bpy-d8 = 4,4′-bipyridine-d8 (fully deuterated). The neutron powder diffraction data reveal a second-order crystallographic phase transition at 290 K. Above 290 K, a disordered structure, space group Immm, is observed that is closely related to the ordered structure previously proposed on the basis of single crystal X-ray diffraction. At low temperatures, the structure is an ordered variant of the high-temperature phase with space group I222. In both phases, the Co ions are linked by the oxalate forming infinite chains that are crosslinked by the bpy ligands. The magnetic susceptibility follows qualitatively a quasi one-dimensional chain behavior. It exhibits a broad maximum around 35 K, corresponding to a strong antiferromagnetic coupling through the oxalate bridges. A kink at 9 K marks the onset of long-range antiferromagnetic ordering due to much weaker interchain magnetic interactions. The magnetically ordered structure determined from the low-temperature neutron diffraction data can be described with the propagation vector (1/2, 1/2, 1/2), i.e. a doubling of the unit cell in each principal direction. It is concluded that a significant antiferromagnetic interaction is mediated through the bpy ligands, although the Co-Co distance along these bridges is 11.4 Å.

AB - Neutron diffraction and magnetic susceptibility studies of the two-dimensional coordination polymer Co(ox)(bpy-d8) are presented, where ox = C2O4 2- and bpy-d8 = 4,4′-bipyridine-d8 (fully deuterated). The neutron powder diffraction data reveal a second-order crystallographic phase transition at 290 K. Above 290 K, a disordered structure, space group Immm, is observed that is closely related to the ordered structure previously proposed on the basis of single crystal X-ray diffraction. At low temperatures, the structure is an ordered variant of the high-temperature phase with space group I222. In both phases, the Co ions are linked by the oxalate forming infinite chains that are crosslinked by the bpy ligands. The magnetic susceptibility follows qualitatively a quasi one-dimensional chain behavior. It exhibits a broad maximum around 35 K, corresponding to a strong antiferromagnetic coupling through the oxalate bridges. A kink at 9 K marks the onset of long-range antiferromagnetic ordering due to much weaker interchain magnetic interactions. The magnetically ordered structure determined from the low-temperature neutron diffraction data can be described with the propagation vector (1/2, 1/2, 1/2), i.e. a doubling of the unit cell in each principal direction. It is concluded that a significant antiferromagnetic interaction is mediated through the bpy ligands, although the Co-Co distance along these bridges is 11.4 Å.

KW - A. Inorganic compounds

KW - C. Neutron scattering

KW - D. Crystal structure

KW - D. Magnetic properties

KW - D. Magnetic structure

UR - http://www.scopus.com/inward/record.url?scp=0036027607&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036027607&partnerID=8YFLogxK

U2 - 10.1016/S0022-3697(01)00080-4

DO - 10.1016/S0022-3697(01)00080-4

M3 - Article

AN - SCOPUS:0036027607

VL - 63

SP - 71

EP - 77

JO - Journal of Physics and Chemistry of Solids

JF - Journal of Physics and Chemistry of Solids

SN - 0022-3697

IS - 1

ER -