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Two New One-Dimensional Homospin Dy(iii) Compounds Showing Slow Magnetic Relaxation
Feng
Luo A B,
Yu-Mei
Song A,
Hai-Xiao
Huang A,
Xiao-Zhao
Tian A,
Gong-Ming
Sun A,
Yan
Zhu A and
Xue-Feng
Feng A
A
Key Laboratory of Radioactive Geology and Exploration Technology Fundamental Science for National Defense, East China Institute of Technology, Fuzhou, 344000 Jiangxi, P. R. China.
B
Corresponding author. Email: ecitluofeng@163.com
Australian Journal of Chemistry
65(10)
1436-1442 http://dx.doi.org/10.1071/CH12233
Submitted: 7 May 2012 Accepted: 19 June 2012 Published:
4
July
2012
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Abstract
In this work, we present two new one-dimensional Dy(iii) compounds, namely [Dy3(L1)9]n (1, HL1 = benzoic acid) and {[Dy4(L2)14][Fe(phen)3]}n (2, HL2 = 3-nitrobenzoic acid, phen = 1,10-phenanthroline). In 1, three distinct coordination polyhedra for Dy(iii) sites including a six-coordinated DyO6 octahedron, a seven-coordinated DyO7 pentagonal bipyramid, and eight-coordinated DyO8 dodecahedron, are observed. These Dy(iii) ions are in turn bridged by L1––carboxylate to give rise to the 1D helical chain structure. Within 2, there are two crystallography-independent Dy(iii) ions that take the mono-capped trigonal bipyramidal geometry. Through L2-carboxylate bridges the Dy(iii) ions are associated together, resulting in the 1D chain structure. Direct current magnetic susceptibilities reveal ferromagnetic interactions, whilst dynamic magnetic studies via alternating current measurements disclose slow magnetic relaxation of these structures. 
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