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- Title
Constructing a Series of Azide-Bridged Cu<sup>II</sup> Magnetic Low-Dimensional Coordination Polymers by using Pybox Ligands.
- Authors
Zhu, Yuan‐Yuan; Cui, Chang; Li, Ning; Wang, Bing‐Wu; Wang, Zhe‐Ming; Gao, Song
- Abstract
Four azide-copper coordination polymers, [Cu2L1(N3)4] n, [Cu2L2(N3)4] n, [Cu2L3 R(N3)4] n, and [Cu2L3 S(N3)4] n, were synthesized by using pybox [pyridine-2,6-bis(oxazolines)] as coligands {L 1: 2,6-bis(4,5-dihydrooxazol-2-yl)pyridine; L 2: 2,6-bis(5,6-dihydro-4 H-1,3-oxazin-2-yl)pyridine; L 3 R or 3 S: 2,6-bis[( R or S)-4-benzyl-4,5-dihydrooxazol-2-yl]pyridine}. Compounds 1 and 2 possess similar 1D infinite azide-copper hexagonal tapes with three types of N3 bridges (two single end-on N3 bridges and one double end-on N3 bridge). Compounds 3 R and 3 S possess an azide-copper 2D honeycomb layer with two types of N3 bridges (a single end-to-end N3 bridge and a double end-on N3 bridge). The chirality of these enantiopure layered structures is controlled by the addition of the chiral pybox ligand in the synthesis, which is very rare for the reported azide-copper coordination polymers. The double end-on N3 bridge transfers mainly ferromagnetic exchange coupling interactions in these four compounds. Owing to the steric hindrance of the pybox ligands, the interchain and interlayer separations are broadened, which weakens the magnetic interactions between them. Thus, no long-range ferromagnetic ordering was observed above 1.8 K. A magnetostructural correlation was also discussed in detail.
- Subjects
COORDINATION polymers synthesis; COPPER; ELECTRIC properties; LIGANDS (Chemistry); MAGNETIC properties; ELECTRIC properties of polymers
- Publication
European Journal of Inorganic Chemistry, 2013, Vol 2013, Issue 17, p3101
- ISSN
1434-1948
- Publication type
Article
- DOI
10.1002/ejic.201300107