1-二茂铁基甲基-2-二茂铁基-3-烷基苯并咪唑盐的合成、晶体结构及性质研究

Synthesis Crystal Structure and Properties of Iodide,Hexafluoro-phosphate and Bis(trifluoromethane sulfonamide) Salts of 1-Ferrocenyl Methyl-2-ferrocenyl-3-alklybenzimidazolium

以二茂铁甲醛为原料,在对甲苯磺酸催化下,与邻苯二胺缩合得到1-二茂铁基甲基-2-二茂铁基苯并咪唑(2),化合物2与碘代烷进行烷基化反应得到1-二茂铁基甲基-2-二茂铁基-3-烷基苯并咪唑碘盐(3,4),并通过阴离子交换反应得到1-二茂铁基甲基-2-二茂铁基-3-烷基苯并咪唑六氟磷酸盐(5,6)及双三氟甲磺酰亚胺盐(7,8).利用1H NMR,13C NMR,IR,MS,HRMS及元素分析对所有产物进行结构表征.化合物5的单晶结构表明该化合物通过分子间氢键作用自组装成了沿c轴无限延伸的一条链状超分子结构.电化学分析表明化合物3～8中的Fe1与Fe2由原来的一组氧化还原峰分离成了两组氧化还原峰.UV-Vis吸收光谱曲线表明所有产物具有光致电荷迁移现象.DSC-TG(差示扫描量热-热重)曲线显示所得碘盐化合物对高氯酸铵(AP)热分解有较好的催化效果.

1-Ferrocenly methyl-2-ferrocenly benzimidazole was sythesized by the reaction of o-phenylenediamine with ferrocenecarboxaldehyde in the condition of toluenesulfonic acid as catalyst. Iodized salts （3, 4） of 1-ferrocenyl methyl- 2-ferrocenyl-3-alkylbenzimidazolium were formed by the reaction of compound 2 with alkyl iodide. Hexafluorophosphate salts （5, 6） and bis（trifluoromethane sulfonimide） salts （7, 8） of 1-ferrocenyl methyl-2-ferrocenyl-3-alkylbenzimidazolium were obtained by the anion exchange reaction of compounds 3 and 4. All of these salts were characterized by 1H NMR, 13C NMR, IR, MS, HRMS and elemental analysis. In the crystal of compound 5, the compound was assembled to a chain supramolecular structure along axis c by the intermolecular hydrogen bonds. Electrochemical analysis demonstrated that the quasi-reversible oxidation waves split double of Fe in ferrocene fragment of compounds 3-8; UV-Vis absorption spectra show that these salts possess photoinduced charge migration phenomenon. And the iodized salts presented good catalytic effect on decomposition of ammonium perchlorate （AP） in DSC-TG test.