氟羟磷灰石通道离子的FTIR研究

以傅立叶变换红外光谱为表征手段,对合成的氟羟磷灰石通道离子进行研究。结果发现:F-离子替换羟基后,羟基在3573和634 cm-1的振动吸收带强度减弱,而在3542、678、715和736 cm-1左右出现新的振动谱带,且随F-离子含量不同出现规律性变化。新出现的谱带数目与群论推测的结果相符,表明该谱带属于羟基基团;羟基振动吸收带的变化,表明F-离子替换羟基的位置,形成[OH…F]氢键,使羟基的伸缩振动向低频偏移,弯曲振动向高频偏移。另外,通过3542-3573cm-1和715-736cm-1左右的谱带相对面积比与F-含量的关系,可为F-离子替换羟基行为提供一些依据。

FTIR Spectroscopic Study on Channel-ions of Fluor-hydroxyapatite

The samples including hydroxyapatite and fluoridated hydroxyapatite with F/(OH-F) mole ratio from 0.1 to 0.9 were characterized by FTIR techniques.The results indicated that the intensity of hydroxyl vibration peaks at 3573 and 634cm-1 weaken when F-ions substituted for hydroxyl.Meanwhile,new vibration bands appeared at 3542,678,715 and 736cm-1.And they varied with the certain rule as content change of F-ions.The amount of these new bands accorded with the result,which we applied group theory and speculated on the number of hydroxyl.The variety of hydroxyl vibration bands indicated that hydrogen-band was formed in apatite structure after F-ions replaced the location of hydroxyl.As a result,hydroxyl stretching bands shifted towards lower frequency field and vibrational bands leaned to higher frequency field.In addition,according to the relationship between F-content and relative area ratio of the spectral bands at 3542～3573cm-1 and 715～736cm-1,it could provide some important evidence for substitution behaviour between F-ions and hydroxyl.