Tuning the Structural and Magnetic Properties of Thermally Robust Coordination Polymers
Thermally robust materials of the M(5-X-pyrimidin-2-olate)2 type [M = Co, X = Cl (1 Cl ), X = Br (1 Br ), X = I (1 I ); M = Zn, X = Cl (2 Cl ), X = Br (2 Br ), X = I (2 I )] have been synthesized. Their X-ray powder diffraction structural characterization has revealed that they crystallize as I4̄2d...
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| Published in: | Inorganic chemistry Vol. 45; no. 19; pp. 7612 - 7620 |
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| Main Authors: | , , , , , , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
United States
American Chemical Society
18-09-2006
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| Online Access: | Get full text |
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| Summary: | Thermally robust materials of the M(5-X-pyrimidin-2-olate)2 type [M = Co, X = Cl (1 Cl ), X = Br (1 Br ), X = I (1 I ); M = Zn, X = Cl (2 Cl ), X = Br (2 Br ), X = I (2 I )] have been synthesized. Their X-ray powder diffraction structural characterization has revealed that they crystallize as I4̄2d diamondoid frameworks, isomorphous to those of the pristine [M(pyrimidin-2-olate)2] n analogues (1 H , M = Co; 2 H , M = Zn). The magnetic measurements of the 1 X series at magnetic fields of 100, 300, and 5000 Oe reveal a weak ferromagnetic ordering taking place below the Néel temperature (T N ∼ 20 K), arising from spin canting phenomena of the antiferromagnetically coupled cobalt centers. Moreover, magnetic hysteresis studies carried out on the 1 X series at 2 K reveal a strong dependence of both the coercive field H coer (2500, 1000, 775, and 500 Oe for 1 Br , 1 Cl , 1 I , and 1 H , respectively) and the remnant magnetization M rem (0.0501 μB for 1 Br and 1 Cl , 0.0457 μB for 1 I , and 0.0358 μB for 1 H ) on the 5-substituent of the pyrimidin-2-olates. The molecular alloys [Co(5-Y-pyrimidin-2-olate)2] (Y = Cl/Br, 1 Cl/Br ) and [Co(5-Y‘-pyrimidin-2-olate)2] (Y‘ = Br/I, 1 Br/I ) have also been prepared and characterized, proving that they have intermediate properties. These materials combine interesting functional properties, such as chemical inertness, magnetism, photoluminescence, and (although weak) SHG activity. |
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| Bibliography: | ark:/67375/TPS-MX8FZV70-D istex:B13837EE8F13D4AC82A00798782482D00E04DF7C ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
| ISSN: | 0020-1669 1520-510X |
| DOI: | 10.1021/ic0602188 |