| 光谱学与光谱分析 |
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| Pressure-Tuning Infrared Spectral Study on the Single-Molecule-Magnet Manganese Complexes |
| XU Zhen-hua1，CHEN Zhi-da1, Ian S Butler2 |
1. The State Key Labosatory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
2. Department of Chemistry, McGill University, 801 Sherbrooke Street West, Quebec, Montreal Canada, H3A 2K6 |
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Abstract The infrared spectra (IR) of single-molecule-magnet manganese complexes [Mn12O12(O2CC6H4-3-Cl)16(H2O)3(3Cl-C6H4CO2H)]·(3-Cl-C6H4CO2H)(Ⅰ) and [Mn12O12(O2CCH2Br)16(H2O)4]·4(CH2Cl2)(Ⅱ) were studied at high external pressure. The different pressure-induced phase transition pressures were observed for both complexes (complex Ⅰ, 25-29 kbar) and (complex Ⅱ, 29-35 kbar). Both were second-order pressure-induced phase transition. The possible changes from higher spin to lower spin happened near the phase transition pressure following the changes of their structures when undergoing the high pressures. The average value of pressure sensitivities in the low-pressure phase is unusually smaller (0.19 cm-1·kbar-1) than in the high-pressure phase (0.29 cm-1·kbar-1) in the complex Ⅰ. On the contrary, the average value of the pressure sensitivities in the low-pressure phase is higher (0.34 cm-1·kbar-1) than in the high-pressure phase (0.23 cm-1·kbar-1) in the complex Ⅱ as usually, which means that the possibility of compression is lower in the high-pressure phase than in the low-pressure phase.
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Received: 2003-07-18
Accepted: 2003-11-26
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Corresponding Authors:
XU Zhen-hua
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| Cite this article: |
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XU Zhen-hua,CHEN Zhi-da,Ian S Butler. Pressure-Tuning Infrared Spectral Study on the Single-Molecule-Magnet Manganese Complexes [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2004, 24(06): 663-665.
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| URL: |
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http://www.gpxygpfx.com/EN/Y2004/V24/I06/663 |
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