Trimeric Hydrogen Bond in Geometrically Frustrated Hydroxyl Cobalt Halogenides
Trimeric Hydrogen Bond in Geometrically Frustrated Hydroxyl Cobalt Halogenides
复制标题
DOI：
10.1088/0256-307x/28/1/017803
复制
发表时间：
2011
影响因子：
3.5
通讯作者：
L. Xiao-dong;Hagihala Masato;Zheng Xu-guang;Tao Wan-Jun;Meng Dong-dong;Zhang Sen-lin;Guo Qi-xin
中科院分区：
文献类型：
--
作者：
L. Xiao-dong;Hagihala Masato;Zheng Xu-guang;Tao Wan-Jun;Meng Dong-dong;Zhang Sen-lin;Guo Qi-xin
用FTIR光谱仪测量了几何阻挫羟基钴卤化物Co2（OH）3Cl和Co2（OH）3Br的中红外吸收光谱，发现羟基的伸缩振动模分别为3549 cm-1和3524 cm-1.通过寻找它们真正的末端O-H基团伸缩振动频率，得到了相应的O-HCl和O-HBr氢键引起的107 cm-1和99 cm-1红移。指出了罕见的三聚体氢键（Co_3 O_H）_3Cl/Br，证明了这种氢键的相对弱性，它可能对晶格对称性和磁结构产生重要影响。
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 3549cm−1 and 3524cm−1 respectively. Through finding their true terminal O-H group stretching vibration frequencies, we obtain 107cm−1 and 99cm−1 red shift caused by the corresponding O-HCl and O-HBr hydrogen bonds. Rarely reported trimeric hydrogen bonds (Co3≡O-H)3Cl/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.