Dichlorobis(pyrimidine-N)cobalt(II) and its bromo derivative

Citation
D. Hashizume et al., Dichlorobis(pyrimidine-N)cobalt(II) and its bromo derivative, ACT CRYST C, 55, 1999, pp. 1793-1797
Citations number
21
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS
ISSN journal
01082701 → ACNP
Volume
55
Year of publication
1999
Part
11
Pages
1793 - 1797
Database
ISI
SICI code
0108-2701(19991115)55:<1793:DAIBD>2.0.ZU;2-E
Abstract
The title compounds, [COCl2(C4H4N2)(2)] and [CoBr2(C4H4N2)(2)], show weak f erromagnetism below 5 K. The relationship between the magnetic properties a nd the structure is discussed. The crystals of the Cl and Br derivatives ar e isomorphous. The Co atom is coordinated with two halogen atoms and four N atoms of pyrimidine molecules at axial and equatorial positions, respectiv ely, to form the octahedral geometry. The nearest neighbouring Co atoms are bridged by the pyrimidine molecules to form a three-dimensional network. A s the pyrimidine molecules are considered to conduct antiferromagnetic inte ractions, the weak ferromagnetism may result from the chiral structure of t he crystals.