Related Experiment Video

Updated: Aug 19, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

Observation of Ferromagnetic and Antiferromagnetic Coupling in 1-D and 2-D Extended Structures of Copper(II)

Laura Deakin¹, Atta M. Arif, Joel S. Miller

¹Department of Chemistry, University of Utah, 315 South 1400 East Rm. Dock, Salt Lake City, Utah 84112-0850.

Inorganic Chemistry

|October 24, 2001

Abstract:

The reaction between CuCl(2).2H(2)O and disodium terephthalate, Na(2)tp, in aqueous solution simultaneously produces chain, bis(aqua)[&mgr;-(terephthalato-kappaO:kappaO')]copper(II), monohydrate, Cutp(OH(2))(2).H(2)O (1), and layered, bis(aqua)[&mgr;-(terephthalato-kappaO)]copper(II), Cutp(OH(2))(2) (2), structured materials. 1 (C(8)H(10)CuO(7)) belongs to the orthorhombic P2(1)2(1)2 space group [a = 6.3015(4) Å, b = 6.8743(4) Å, c = 22.9972(14) Å, and Z = 4] and incorporates tp in a bridging bis-monodentate binding mode and Cu(II) in a tetragonally elongated octahedron. 2 (C(8)H(10)CuO(6)) which belongs to the orthorhombic Pmc2(1) space group [a = 10.7421(8) Å, b = 7.2339(10) Å, c = 5.7143(13) Å, and Z = 2] incorporates tp in a mono-bidentate binding mode and Cu(II) in a distorted square pyramid. 1 and 2 exhibit axial X-band powder EPR spectra with g( perpendicular) = 2.08, g( parallel) = 2.29 (1) and g( perpendicular) = 2.07, g( parallel) = 2.29 (2) at 300 K. 1 obeys the Curie-Weiss law at high temperatures (theta = -7.2 K) and at low temperatures behaves as 1-D magnetic chains with an exchange-coupling constant of J/k(B)= -9.15 K (H = -2JS(1).S(2)). This material displays a spontaneous moment below 2 K under small applied magnetic fields, consistent with the presence of spin canting. 2 exhibits ferromagnetic interactions with theta = +0.8 K. Along the 1-D chain where coordinated water forms the bridge between metal centers, the coupling between Cu(II) is J/k(B) = +0.6 K. The fit of the magnetic susceptibility for 2 using a molecular field correction, which takes into consideration antiferromagnetic interactions between chains via the tp ligand, yields J'/k(B) = -0.13 K.

More Related Videos

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe₁₊_YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

Related Concept Videos

Bonding in Metals

Bonding in Metals

Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...

¹H NMR: Long-Range Coupling

¹H NMR: Long-Range Coupling

The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene π orbitals.

Ferromagnetism

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...

Articles linked to this work by shared authors, journal, and citation graph.

Structure and Magnetic Properties of Antiferromagnetic Manganese(III) Tetrakis(4- methoxyphenyl)porphyrin Tetracyanoethenide, [MnTOMePP][TCNE].2PhMe, and Manganese(III) Tetrakis(2-fluorophenyl)porphyrin Tetracyanoethenide, [MnTFPP][TCNE].2PhMe.

Inorganic chemistry·2001

Observation of Magnetic Ordering as High as 28 K for meso-Tetrakis(4-halophenyl)porphinatomanganese(III) Tetracyanoethenide, [MnTXPP][TCNE] (X = F, Br, I).

Inorganic chemistry·2001

Weak Effect on T(c) with Increased Interchain Distances. Structure and Magnetic Properties of (meso-Tetrakis(3,5-di-tert-butyl-4-hydroxyphenyl)porphinato)manganese(III) Tetracyanoethenide, [Mn(III)TP'P](+)[TCNE](*-).

Inorganic chemistry·1996

See all related articles