Coordination polymers of cobalt(II) with pyrimidine and pyrazine: Syntheses, structures and magnetic properties

• Published in: Inorganic chemistry communications Vol. 11; no. 9; pp. 1015 - 1018
• Main Authors: Kiskin, Mikhail A., Aleksandrov, Grygory G., Bogomyakov, Artem S., Novotortsev, Vladimir M., Eremenko, Igor L.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-09-2008
• Subjects: Carboxylate ligands; Magnetic properties; Polymeric cobalt(II) complex; X-ray diffraction analysis; Polymeric cobalt(II) complex; Carboxylate ligands; X-ray diffraction analysis; Magnetic properties
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2008.05.018

New 2D-polymer [Co
2(μ-OH
2)(μ-Piv)
2(Piv)
2(μ-L
1)
2]
n
(
2) and 3D-polymer [Co
5(μ-OH
2)(μ
3-OH)(μ
3-Piv)(μ-Piv)
5(Piv)
3(μ-L
2)
4]
n
(
3) have been synthesized and characterized. It was shown that compound
2 undergoes antiferromagnetic ordering with weak ferromagnetism at
T
N
=
4.5
K with
σ
0(2
K)
=
4000
G
cm
3/mol.
New 2D-polymeric compound [Co
2(μ-OH
2)(μ-Piv)
2(Piv)
2(μ-L
1)
2]
n
(
2) was synthesized in the reaction of the cobalt(II) pivalate [Co(Piv)
2]
n
(
1, Piv is an anion of pivalic acid) and pyrimidine (L
1) in MeCN. 3D-polymer [Co
5(μ-OH
2)(μ
3-OH)(μ
3-Piv)(μ-Piv)
5(Piv)
3(μ-L
2)
4]
n
(
3) was prepared by the reaction of the polymer [Co(Piv)
2]
n
(
1) with pyrazine (L
2). Complexes
2 and
3 were characterized by the X-ray diffraction and magnetic susceptibility. It was shown that compound
2 undergoes antiferromagnetic ordering with weak ferromagnetism at
T
N
=
4.5
K with
σ
0(2
K)
=
4000
G
cm
3/mol.