High-resolution77SeNMR spectra in singlecrystals of potassium and rubidiumhydrogenselenites have been studied using the cross-polarization method. The chemical shift tensors of selenium nuclei are determined from the angular dependences of the position of lines relative to liquid H2SeO4. The parameters of the tensors are typical for the HSeO−3 configuration. The spectra are measured at different
使用交叉极化方法研究了钾和rub氢亚硒酸盐单晶中的高分辨率77 Se NMR光谱。硒原子核的化学位移张量由线相对于液体H 2 SeO 4的位置的角度依赖性确定。张量的参数是HSeO - 3配置的典型参数。在不同温度下测量光谱以寻找相变。未发现相变,证实了我们先前的结果。
Molecular spectra and X-ray study of the alkali hydrogen selenites MHSeO3
cation, to which 10 oxygen atoms are coordinated from 6 different HSeO−3 anions and the pyramidal HSeO−3 anion. The hydrogen selenite anions are hydrogenbonded to form spiral chains along the c-axis. The SeO(H) distance corresponds to an asymmetrical arrangement of the hydrogen bond. The space group found and the asymmetrical position of the proton in the hydrogen bond are in agreement with the pyroelectric