Abstract
Four novel coordination polymers, one-dimensional chains [M(PTE)2(N3)2]n (M = Mn for 1 and Co for 2), and two-dimensional layers [M(PTE)2(dca)2]n (M = Mn for 3 and Co for 4) (PTE = 1-(2,4-difluorophenyl-2-(1H-1,2,4-triazol-1-yl)ethanone, dca = dicyanamide anion, N(CN)2-), have been synthesized under mild ambient conditions and structurally characterized by single crystal X-ray diffraction. In all four crystal structures, the metal atoms adopt octahedral coordination geometry with six nitrogen atoms from two monodentate PTE ligands and four azido (or dca) bridging ligands. The crystal structures of 1 and 2 are isostructural 1-D polymeric chains, alternatively linked by double end-on and double end-to-end azido bridges. However, the bent dca ligands as bidentate μ2-1,5 bridging ligands interlink the octahedral metal units to lead to 2-D (4,4) grid networks in 3 and 4. Temperature-dependent magnetic measurements in 2-300 K have been performed for these four polymers, and suggest alternative ferro- and antiferromagnetic couplings for end-on and end-to-end azido bridges in 1, and the dominant ferromagnetic coupling in 2, respectively. Both polymers 3 and 4 show weak antiferromagnetic exchanges through the μ2-1,5-dca bridges. The effects of auxiliary coligands on the structure and the nature of these magnetic exchanges are discussed in the light of the crystal structures in detail.
| Original language | English |
|---|---|
| Pages (from-to) | 4867-4874 |
| Number of pages | 8 |
| Journal | Inorganica Chimica Acta |
| Volume | 362 |
| Issue number | 14 |
| DOIs | |
| Publication status | Published - Nov 10 2009 |
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Keywords
- Azido bridge
- Coordination polymer
- Crystal structure
- Magnetic property
- Triazolyl derivate
ASJC Scopus subject areas
- Inorganic Chemistry
- Physical and Theoretical Chemistry
- Materials Chemistry
Cite this
Four novel Co(II) and Mn(II) coordination polymers with triazolyl derivate : Syntheses, crystal structures and magnetic properties. / Zhang, Lei; Ling, Yun; Hu, Ai Xi; Yao, Ting Ting; Li, Jing.
In: Inorganica Chimica Acta, Vol. 362, No. 14, 10.11.2009, p. 4867-4874.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Four novel Co(II) and Mn(II) coordination polymers with triazolyl derivate
T2 - Syntheses, crystal structures and magnetic properties
AU - Zhang, Lei
AU - Ling, Yun
AU - Hu, Ai Xi
AU - Yao, Ting Ting
AU - Li, Jing
PY - 2009/11/10
Y1 - 2009/11/10
N2 - Four novel coordination polymers, one-dimensional chains [M(PTE)2(N3)2]n (M = Mn for 1 and Co for 2), and two-dimensional layers [M(PTE)2(dca)2]n (M = Mn for 3 and Co for 4) (PTE = 1-(2,4-difluorophenyl-2-(1H-1,2,4-triazol-1-yl)ethanone, dca = dicyanamide anion, N(CN)2-), have been synthesized under mild ambient conditions and structurally characterized by single crystal X-ray diffraction. In all four crystal structures, the metal atoms adopt octahedral coordination geometry with six nitrogen atoms from two monodentate PTE ligands and four azido (or dca) bridging ligands. The crystal structures of 1 and 2 are isostructural 1-D polymeric chains, alternatively linked by double end-on and double end-to-end azido bridges. However, the bent dca ligands as bidentate μ2-1,5 bridging ligands interlink the octahedral metal units to lead to 2-D (4,4) grid networks in 3 and 4. Temperature-dependent magnetic measurements in 2-300 K have been performed for these four polymers, and suggest alternative ferro- and antiferromagnetic couplings for end-on and end-to-end azido bridges in 1, and the dominant ferromagnetic coupling in 2, respectively. Both polymers 3 and 4 show weak antiferromagnetic exchanges through the μ2-1,5-dca bridges. The effects of auxiliary coligands on the structure and the nature of these magnetic exchanges are discussed in the light of the crystal structures in detail.
AB - Four novel coordination polymers, one-dimensional chains [M(PTE)2(N3)2]n (M = Mn for 1 and Co for 2), and two-dimensional layers [M(PTE)2(dca)2]n (M = Mn for 3 and Co for 4) (PTE = 1-(2,4-difluorophenyl-2-(1H-1,2,4-triazol-1-yl)ethanone, dca = dicyanamide anion, N(CN)2-), have been synthesized under mild ambient conditions and structurally characterized by single crystal X-ray diffraction. In all four crystal structures, the metal atoms adopt octahedral coordination geometry with six nitrogen atoms from two monodentate PTE ligands and four azido (or dca) bridging ligands. The crystal structures of 1 and 2 are isostructural 1-D polymeric chains, alternatively linked by double end-on and double end-to-end azido bridges. However, the bent dca ligands as bidentate μ2-1,5 bridging ligands interlink the octahedral metal units to lead to 2-D (4,4) grid networks in 3 and 4. Temperature-dependent magnetic measurements in 2-300 K have been performed for these four polymers, and suggest alternative ferro- and antiferromagnetic couplings for end-on and end-to-end azido bridges in 1, and the dominant ferromagnetic coupling in 2, respectively. Both polymers 3 and 4 show weak antiferromagnetic exchanges through the μ2-1,5-dca bridges. The effects of auxiliary coligands on the structure and the nature of these magnetic exchanges are discussed in the light of the crystal structures in detail.
KW - Azido bridge
KW - Coordination polymer
KW - Crystal structure
KW - Magnetic property
KW - Triazolyl derivate
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U2 - 10.1016/j.ica.2009.07.017
DO - 10.1016/j.ica.2009.07.017
M3 - Article
VL - 362
SP - 4867
EP - 4874
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
SN - 0020-1693
IS - 14
ER -