基于TCNQ电荷转移化合物的合成与光谱性质  

Charge-Transfer Compounds Based on TCNQ:Synthesis and Spectroscopic Properties

作　　者：汪鹏飞[1] 陈友存[1] 

机构地区：[1]安庆师范学院化学系

出　　处：《光谱学与光谱分析》2008年第6期1372-1374,共3页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(20371002);安徽省教育厅重点基金项目(2006kj042A)资助

摘　　要：π电子受体TCNQ的电荷转移化合物有奇特的电学和磁学性质,在该类电荷转移化合物中,TCNQ的形态对化合物的性质有较大的影响。文章合成了两种电荷转移化合物[RBz（4-CH3）Py][TCNQ]（R=Br（1）,I（2））,通过元素分析、红外光谱和拉曼光谱对其进行了表征。这两种化合物的元素分析结果显示与理论值一致。通常在2 200 cm-1附近的C≡N的伸缩频率经常被用来确定TCNQ分子的电荷,TCNQ中性分子的ν（CN）在2 222 cm^-1以上,而这两种化合物的ν（CN）都向低波数移动,在2 185-2 156 cm^-1之间。通过对两种化合物红外和拉曼光谱的测定,显示了其中的TCNQ形态是TCNQ阴离子自由基（TCNQ-）。Charge-transfer materials based on organic donors and acceptors have been under investigation, beginning with the first reports of conducting salts of organocyanide acceptors such as TCNQ. Charge-transfer compounds of the a--electron acceptor 7,7,8,8,-tetracyanoquinodimethane（TCNQ） show unusual electrical and magnetic properties. The form of TCNQ has a dramatic effect on the properties of the kinds of charge-transfer compounds. In order to further study the vibrational spectroscopy of the organic semiconductor, two kinds of （1 ： 1） charge transfer compounds of TCNQ and [RBz（4-CH3）Py][TCNQ] （R= Br（1）, I （2）） were synthesized and characterized by elemental analysis, infrared spectrum and Raman spectrum. The tested results of elementary analysis of the charge transfer compounds （1） and （2） were consistent with theoretical values. The IR and Raman spectra of （1） and （2） which indicate the presence of a type of TCNQ species, general speaking, the C ≡N stretching frequencies a- round 2 200 cm^-1 , were used to determine the average charge on the TCNQ units, v（CN） for the neutral TCNQ molecule is higher than 2 200 cm^-1 ）, however, v（CN） for the compounds is from 2 185 to 2 156 cm^-1 , both shift to lower frequencies, which were consistent with the frequencies of the TCNQ radical anion. In conclusion, the results of IR and Rarnan spectrum were consistent with the TCNQ radical anion in the compounds, namely TCNQ^-.

关 键 词：TCNQ自由基 拉曼光谱 红外光谱 电荷转移化合物 

分 类 号：O614.1[理学—无机化学]