Structure and Magnetic Properties of a Single-strand Helical Cobalt(II) Coordi- nation Polymer
Quan-Li Chena,b, Jing-Zhong Chenb, Xian-Wen Wangb,c, and Yong-Hua Zhangc
aGemmological Institute, China University of Geosciences, Hubei, Wuhan 430074, P. R. China
bFaculty of Material Science and Chemical Engineering, China University of Geoscience, Hubei, Wuhan 430074, P. R. China
cFaculty of Materials Science and Engineering, South China University of Technology, Guangdong, Guangzhou 510641, P. R. China
Reprint requests to Prof. Jing-Zhong Chen.
E-mail: jzhchen@cug.edu.cn or Dr. Xian-Wen Wang.
E-mail: wxw10108092@yahoo.com.cn Z. Naturforsch.2009,64b,335 – 338;
received November 12, 2008
The one-dimensional helical chain-like coordination poly- mer [Co(bpdc)(H2O)3]·H2O (1) has been synthesized by hydrothermal reaction of pdon with Co(NO3)2·6H2O and Na2B4O7(bpdc = 2,2-bipyridyl-3,3-dicarboxylate, pdon = 1,10-phenanthroline-5,6-dione).1crystallizes in the mono- clinic space group P21/n with the cell parameters: a = 9.987(1),b= 9.238(1), c = 16.080(2) ˚A,β = 97.471(1)◦, V= 1471.0(3) ˚A3,Z= 4. The bpdc ligand has resulted from anin situcarbon-carbon bond cleavage in the pdon ligand.
The Co(II) atom is surrounded by two nitrogen atoms of the bpdc pyridyl groups and four O atoms, of which three be- long to coordinated water molecules and one to a bpdc carb- oxylate group. The six-coordinated Co(II) atom adopts a dis- torted octahedral geometry. Compound1displays antiferro- magnetic interactions. Above 30 K,χm−1obeys the Curie- Weiss law withC= 3.12 cm3K mol−1andΘ=−10.6 K.
Key words:Cobalt(II), Crystal Structure, Magnetic Properties
