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Dipyrimidine-copper(II) dinitrate complexes showing magnetic interactions.

M Yasui¹, Y Ishikawa, N Akiyama

¹Department of Applied Physics and Chemistry, The University of Electro-Communications, Chofu, Tokyo 182-8585, Japan.

Acta Crystallographica. Section B, Structural Science

|May 25, 2001

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Three copper(II) complexes, including coordination polymers, exhibited distinct magnetic interactions (ferromagnetic, antiferromagnetic, paramagnetic) at low temperatures. These findings highlight the role of coordination polymers in magnetic properties.

Area of Science:

Coordination Chemistry
Solid-State Chemistry
Magnetism

Background:

Copper(II) complexes with pyrimidine ligands are investigated for their magnetic properties.
Coordination polymers often exhibit unique magnetic behaviors due to their extended structures.

Purpose of the Study:

To synthesize and characterize copper(II) complexes with pyrimidine ligands.
To investigate the magnetic interactions in these complexes at low temperatures.
To correlate crystal structure with observed magnetic properties.

Main Methods:

Single-crystal X-ray diffraction for structural analysis.
Magnetic susceptibility measurements at low temperatures.

Main Results:

Related Experiment Videos

Three crystalline copper(II) complexes were synthesized: [Cu(NO3)2(pm)2]n (1), [Cu(NO3)2(H2O)2(pm)]n (2), and Cu(NO3)2(H2O)2(pm)2 (3).
Complexes (1) and (2) formed one-dimensional coordination polymers, while (3) did not.
Complex (1) showed ferromagnetic interactions (2J/kB = +1.8 K), complex (2) showed antiferromagnetic interactions (2J/kB = -36 K), and complex (3) was paramagnetic.

Conclusions:

The formation of coordination polymers is crucial for observing significant magnetic interactions.
The type of coordination by bridging ligands influences the magnetic properties of copper(II) complexes.
Complexes (1) and (2) serve as examples of uniform S=1/2 ferromagnetic and antiferromagnetic Heisenberg chains, respectively.