氟氢化钾固-固相变的变温红外光谱测定  

IR Spectra at various Temperatures for Potassium Hydrogen Difluoride

作　　者：武克忠[1] 左萍[1] 张建玲[2] 刘晓地[1] 

机构地区：[1]河北师范大学化学系,石家庄050016 [2]中国科学院化学研究所,北京100080

出　　处：《无机化学学报》2001年第3期435-437,共3页Chinese Journal of Inorganic Chemistry

基　　金：河北省教委专项科研项目(No.97116)。

摘　　要：The solid-solid phase transition of KHF2 was studied by infrared spectrometry at various temperatures and by differential scanning calorimetry(DSC) also. There are hydrogen bonds between the molecules which play a dominant role to the structure at low temperature state. In the temperature range closely corresponding to the solid-solid phase transition, the frequency of antisymmetric stretching(v3) shifted to a higher wavenumber, and the bending(v2) to lower wavenumber. The enthalpy and the temperature of solid-solid phase transition for KHF2 were measured by DSC method and the latter is consistent with the result of IR which could declare the mechanism of solid-solid phase transition of KHF2. With the breaking of hydrogen bonds between the molecules and the introduction of vibrational and rotational disorder KHF2 exhibited crystalline transition.The solid-solid phase transition of KHF2 was studied by infrared spectrometry at various temperatures and by differential scanning calorimetry(DSC) also. There are hydrogen bonds between the molecules which play a dominant role to the structure at low temperature state. In the temperature range closely corresponding to the solid-solid phase transition, the frequency of antisymmetric stretching(nu (3)) shifted to a higher wavenumber, and the bending(nu (2)) to lower wavenumber. The enthalpy and the temperature of solid-solid phase transition for KHF2 were measured by DSC method and the latter is consistent with the result of IR which could declare the mechanism of solid-solid phase transition of KHF2. With the breaking of hydrogen bonds between the molecules and the introduction of vibrational and rotational disorder KHF2 exhibited crystalline transition.

关 键 词：氟氢化钾 固-固相变 变温红外光谱 

分 类 号：O614.113[理学—无机化学]