A Zn(Ⅱ) Coordination Polymer Based on a Flexible Polycarboxylate Ligand 5-(4-Hydroxypyridinium-1-ylmethyl)-isophthalic Acid: Synthesis, Structure, and Property

摘要

A Zn(Ⅱ) supramolecular coordination polymer,{[Zn2(L)2(m-bix)(H2O)]·6H2O}n (1),with an interesting 1D→2D polythreading array from a flexible and angular organic aromatic polycarboxylate ligand 5-(4-hydroxypyridinium-l-ylmethyl)isophthalic acid (H2L),and N-donor ligand 1,3-bis(imidazol-1-ylmethyl)benzene (m-bix),has been obtained under hydrothermal conditions and characterized by elemental analysis,powder X-ray diffraction (PXRD),IR,thermal gravimetric analyses (TGA) and single-crystal X-ray diffraction.In 1,the Zn(Ⅱ) center has two coordination geometries.One exhibits a trigonal bipyramidal coordination sphere,and the other is a tetrahedral geometry;L2-has two different coordination modes,with one connecting three Zn(Ⅱ) ions through two monodentate carboxylate groups and the monodentate hydroxyl group,and the other bridging two Zn(Ⅱ) ions through two carboxylate groups.The L2-anions connect the Zn(Ⅱ) centers forming an infinite 1D tubular structure.These 1D tubes are interconnected by the m-bix spacers to form a 2D framework.Such 2D layers are further assembled into a 3D supramolecular network via hydrogen bonds.Meanwhile,the luminescent property of 1 has also been investigated in detail.