| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Trimeric Hydrogen Bond in Geometrically Frustrated Hydroxyl Cobalt Halogenides |
| LIU Xiao-Dong1,2**, Hagihala Masato1, ZHENG Xu-Guang1,3**, TAO Wan-Jun2, MENG Dong-Dong1,2, ZHANG Sen-Lin2, GUO Qi-Xin4
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1Department of Physics, Graduate School of Science and Engineering, Saga University, Saga 840-8502, Japan
2Department of Physics, College of Science, Tianjin Polytechnic University, Tianjin 300160
3Department of Physics, Faculty of Science and Engineering, Saga University, Saga 840-8502, Japan
4Synchrotron Light Application Center & Department of Electrical and Electronic Engineering, Saga University, Saga 840-8502, Japan
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LIU Xiao-Dong, Hagihala Masato, ZHENG Xu-Guang et al 2011 Chin. Phys. Lett. 28 017803 |
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Abstract The mid-infrared absorption spectra of geometrically frustrated hydroxyl cobalt halogenides Co2(OH)3Cl and Co2(OH)3Br are measured by FTIR spectrometers, and the stretching vibrational modes of hydroxyl groups are found to be 3549 cm−1 and 3524 cm−1 respectively. Through finding their true terminal O–H group stretching vibration frequencies, we obtain 107 cm−1 and 99 cm−1 red shift caused by the corresponding O–H⋅⋅⋅Cl and O–H⋅⋅⋅Br hydrogen bonds. Rarely reported trimeric hydrogen bonds (Co3≡O–H)3⋅⋅⋅Cl/Br are pointed out to demonstrate the relative weakness of this kind of hydrogen bond which may have a critical effect on the lattice symmetry and magnetic structures.
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| Keywords:
78.30.-j
33.20.EA
61.66.Fn
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Received: 11 June 2010
Published: 23 December 2010
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