Construction And Properties Of Coordination Polymers With Substituted Benzimidazole Ligands

Coordination polymers（CPs）are formed by self-assembly of metal ions and organic linkers.The selection of metal ions and organic ligands plays a key role in the construction of multifunctional CPs.Although some progress has been made in the research on CPs,there is still a great challenge to fully predict their structures.Ten kinds of CPs were synthesized by choosing different organic ligands and metal salts.Their structure and fluorescence properties were characterized and analyzed by a series of measures,in order to provide a theoretical basis for the directional synthesis of CPs with specific structures and functions.Five substituted bisbenzimidazole ligands,four aromatic carboxylic acids and two Cd^II/Zn^II metal salts were selected to obtain ten new complexs under hydrothermal conditions.1 is a（4,4,4,6）-connected three-dimensional（3D）new topological framework,2is a hexagonal honeycomb two-dimensional（2D）hcb network,3 is a（3,4,4）-connected 3D new topology,and 4 has a binuclear ring-closed structural unit,which can form 2D supramolecular network through hydrogen bonding.5,7 and 9 are all typical 2D single-node sql topology networks.6 is a 3D→3D triple interpenetrating sqc6 topology.8 is a two-node（3,4）-connected 2D 34L83 topology.10 is a 3D→3D triple interpenetrating sra network framework.1～10 all exhibited good thermal stability,p H stability and excellent photoluminescence properties.1 can recognize acetylacetone and Tb³⁺ions by fluorescence quenching and fluorescence enhancement,respectively.2～4 can be used as highly selective fluorescent sensors for Cr₂O₇^2-anion in aqueous solutions,and 2 and 4 can also be used to detect levofloxacin（LVX）in water with high sensitivity.The 5～7 can be ideal candidates for efficient detection of Fe³⁺ions and LVX.8 can be used as a bifunctional fluorescent sensor for sensitive detection of Fe³⁺ions and LVX.In addition,9 and 10 can be used to detect Fe³⁺ions.Figure 92;Table 15;Reference 74...