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我们以2-氨基吡啶与五种卤代烷反应,制得相应的N-烷基-2-氨基吡啶季铵盐卤化物,再与7,7,8,8-四腈代对苯醌二甲烷(TCNQ)或与锂-7,7,8,8-四腈代对苯醌二甲烷(LiTCNQ)反应,得到离子自由基型电荷转移复合物。对1:1复合物及1:2复合物的制备、紫外-可见吸收光谱、顺磁性及电导性进行了研究。结果表明,在乙腈中生成1:2复合物,而不生成1:1复合物;季铵盐上烷基较大时(如C_4H_9,C_5H_(11)),由于空间阻碍效应,在溶剂中不易生成1:2复合物,不易结晶;烷基大小对生成电荷转移复合物的电导率有影响。这类单盐和复盐用紫外-可见吸收光谱及顺磁共振谱很易鉴别。
We react with 2-aminopyridine and five alkyl halides to obtain the corresponding N-alkyl-2-aminopyridine quaternary ammonium halides, which are then reacted with 7,7,8,8-tetramethylnitrile benzoquinonedimethane (TCNQ ) Or with lithium-7,7,8,8-tetramethylnitrobenzoquinonediquomethane (LiTCNQ) to give ion radical type charge-transfer complexes. The preparation of 1: 1 complex and 1: 2 complex, UV-Vis absorption spectra, paramagnetic and electrical conductivity were studied. The results showed that 1: 2 complex was formed in acetonitrile, but no 1: 1 complex was formed. When the alkyl groups on quaternary ammonium salt were relatively large (such as C_4H_9 and C_5H_ (11)), Generate 1: 2 complex, not easy to crystallize; alkyl size has an influence on the conductivity of the charge-transfer complex. Such single salt and double salt UV-visible absorption spectra and paramagnetic resonance spectroscopy is easy to identify.