六(4-羧基苯氧基)环三聚膦腈氢键超分子自组装

Self-assembly of hydrogen-bonded supramolecule based on hexakis (4-carboxyphenoxy) cyclotriphosphazene

目的以六(4-羧基苯氧基)环三聚膦腈为构筑单元,通过氢键与4,4′-联吡啶结合形成孔穴较大的网络超分子。方法以六氯环三聚膦腈为初始材料,合成带有多羧基的环三聚膦腈-六(4-羧基苯氧基)环三聚膦腈。六(4-羧基苯氧基)环三聚膦腈与4,4′-联吡啶(物质的量比1∶3)在DMF溶剂中通过氢键作用形成超分子。结果元素分析及变温红外光谱(FTIR)证明羧基和吡啶基之间氢键的存在,且所有的羧酸和吡啶都参与了成键。结论 4,4'-联吡啶可能是通过与三聚膦腈环平面相垂直的位置与羧基形成氢键,自组装成圆柱型结构网络超分子。

Aim Hexakis（4-carboxyphenoxy） cyclotriphosphazene（HCPCP） as a building block interacts with 4,4′-bipyridine through hydrogen-bonding to construct a supramolecular network with large porosity.Methods HCPCP was synthesized by using hexachlorocyclotriphosphazene as starting material.A hydrogen-bonded supramolecule was assembled from DMF solution containing HCPCP and 4,4′-bipyridine in 1∶3 molar ratio.Results The VT-FTIR spectra and elemental analysis demonstrated that hexakis（4-carboxyphenoxy）cyclotriphosphazene and 4,4′-bipyridine are linked through hydrogen bonding between carboxyl and pyridyl groups.Conclusion It is suggested that all of carboxyl and pyridyl groups located at perpendicular positions on the phosphazene ring interact through hydrogen bonding to afford a cylindrical network.