Self-assembly of[Pd6(L)4]8+-type macrocyclic complexes for fluorescent sensing of HSO3-
In this study,parallelogram-like macrocyclic supramolecular metallacycles[Pd6(bpy)6(L1)4](PF6)8(1a)and[Pd6(bpy)6(L2)4](PF6)8(2a),where HL1=1-(1H-pyrazole-4-yl)-4-(4-pyridyl)benzene,HL2=9-(1H-pyrazole-4-yl)-10-(4-pyridyl)anthracene,and bpy=2,2'-bipyridine,are synthesized by reacting aryl pyrazole pyridine ligands with dipalla-dium corners in aqueous solutions via metal-directed hierarchical self-assembly.The structures of the supramolecu-lar Pd parallelograms are confirmed through single-crystal X-ray diffraction.Notably,the two parallelogram metal 1a-cycles can be used as"turn-on"fluorescence sensors to detect HSO3-through a disassembly mechanism.In addi-tion,the 1a-based sensor shows selective detection of HSO3-without interference from other anions.The detection limit was as low as 0.131 µmol·L-1.Furthermore,complex 1a presented the semiquantitative visual detection ability for HSO3-in the test trip mode via fluorescence changes.CCDC:2308664,1a;2308665,2a.
NETL
NSTL
万方数据
