Two 1D chain complexes based on N,N′-bis(4-pyridylmethyl)pyromellitic diimide and fluorescence azide sensing

Two complexes, {[Hg(4-pmpmd)Br₂]•CHCl₃)}<i>_n</i>(<b>1</b>), [Cd(4-pmpmd) (CF₃SO₃)₂]<i>_n</i> (<b>2</b>) were synthesized (4-pmpmd: N,N′-bis(4-pyridylmethyl)pyromellitic diimide). Both complexes were characterized by IR spectroscopy, powder X-ray diffraction, elemental analyses, single crystal X-ray diffraction, and thermogravimetric analyses. Complex <b>1</b> features a typical 1D zigzag chain structure with the adjacent chains intertwined via hydrogen bonds, while complex <b>2</b> shows 1D parallel-packed wavy chains structure through π···π stacking interactions. The weak interactions of pyromellitic diimide and anions effect on 1D chain supramolecular structural diversity. Taking advantage of azide anion strong binding affinities, complex <b>2</b> could be developed as fluorescence sensor for azide anion. Two 1D chain complexes were synthesized based on N,N′-bis(4-pyridylmethyl) pyromellitic diimide, the anions and pyromellitic diimide ligand effect on 1D chains supramolecular structural diversity. Complex <b>2</b> was promising for fluorescence sensing azide anion.

两种配合物{[Hg(4-pmpmd)Br₂]•CHCl₃}ₙ(**1**)与[Cd(4-pmpmd)(CF₃SO₃)₂]ₙ(**2**)已被成功合成，其中4-pmpmd为N,N'-双(4-吡啶甲基)均苯四甲酸二酰亚胺（N,N′-bis(4-pyridylmethyl)pyromellitic diimide）。两种配合物均通过红外光谱、粉末X射线衍射、元素分析、单晶X射线衍射以及热重分析完成表征。配合物**1**具有典型的一维锯齿链结构，相邻链之间通过氢键相互缠结；配合物**2**则借助π···π堆积作用形成一维平行堆积的波浪链结构。均苯四甲酸二酰亚胺与阴离子的弱相互作用对一维链超分子结构的多样性具有调控作用。利用叠氮根阴离子的强结合亲和力，配合物**2**可被开发为叠氮根阴离子的荧光传感器。本研究基于N,N'-双(4-吡啶甲基)均苯四甲酸二酰亚胺合成了两种一维链状配合物，阴离子与该配体对一维链超分子结构多样性具有显著影响，且配合物**2**在叠氮根阴离子荧光传感领域具备应用前景。