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Mössbauer Studies on Spin Transition in Zinc Dilution Complexes [Fe1-xZnx(dpp)2(NCS)2].py (x = 0.05-0.40)
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| HUANG Hong-Bo1;TAO Jian-Qing2;YU Zhi1,3;SHAO Ting3;HSIA Yuan-Fu1 |
| 1Department of Physics, Nanjing University, Nanjing 210093
2Department of Chemistry, Yancheng Teachers College, Yancheng 224002
3State Key Laboratory of Coordination Chemistry, Department of Chemistry, Nanjing University, Nanjing 210093 |
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| Cite this article: |
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HUANG Hong-Bo, TAO Jian-Qing, YU Zhi et al 2003 Chin. Phys. Lett. 20 1161-1164 |
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Abstract A series of spin transition complexes [Fe1-xZnx(dpp)2(NCS)2]py (x = 0.05, 0.10, 0.15. 0.20, 0.25, and 0.40; py=pyridine) has been synthesized and studied by Mössbauer spectroscopy. The high spin structure is frozen at room temperature, and the induced meta-stable high-spin phase by the so-called rapid cooling method is monitored by temperature and time dependent Mössbauer spectra. The investigation on dynamic relaxation of the high-spin state to the low spin state at 80 K reveals sigmoid behaviour and existence of cooperative effect for low diluted complexes. This cooperative effect is wrecked by the dilution of Zn(II) ions in Fe(II) ion sites, and relaxation curves gradually become to obey the first-order kinetics as the ratio of the dilution increases.
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82.80.Ej
81.05.-t
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Published: 01 July 2003
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| PACS: |
82.80.Ej
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(X-ray, M?ssbauer, and other γ-ray spectroscopic analysis methods)
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81.05.-t
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(Specific materials: fabrication, treatment, testing, and analysis)
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