A pillar-layered metal-organic framework as luminescent sensor for selective and reversible response of chloroform.

A new 3D metal-organic framework, namely, {Zn 4 (H 2 BPTC) 2 (HCOO) 4 } n ( SNNU-1 , H 4 BPTC=biphenyl-3,3',5,5'-tetracarboxylic acid, SNNU =Shaanxi Normal University) has been solvothermal synthesized. Four independent tetrahedral Zn atoms are connected by organic ligands to form a 2D Zn-H 2 BPTC layer, which is further bridged by in-situ generated HCOO - to give the 3D pillar-layered framework of SNNU-1 . Unique Zn and H 2 BPTC all act as 4-connected nodes leading to a new 4,4,4-connected topological net with point symbol of {4·5·6 2 ·8 2 }{4·5 2 ·6 2 ·8}{5 2 ·6 3 ·7}. Notably, intense blue emission band is observed for SNNU-1 , which exhibits solvent-dependent effect. Compared to other common organic solvents, chloroform can specially improve the photoluminescent intensity of SNNU-1 . Further repeated response and release experiments clearly showed that SNNU-1 can act as luminescent sensor for selective and reversible detection of chloroform. [ABSTRACT FROM AUTHOR]