pH-stable porous mechanically interlocked 2D metal-organic polyrotaxane for in situ organochlorine insecticide encapsulation, sensing and removing

Mechanically interlocked structures such as rotaxanes, catenanes, and borromean rings are new materials [1], which are known for their interesting structures and have made an impact with their potential applications in different fields such as molecular machines so that the 2016 Nobel Prize for Chemistry was awarded for work on such systems [2]. 4,4′-Sulfonyldibenzoic acid (H2sdba) is a V-shaped organic ligand (Scheme 1), which is used in many mechanically interlocked molecular architectures such as interlocked supramolecular metal-organic frameworks (MOFs) and coordination polymers (CPs) [3]. In this work we introduce a new porous 2D metal-organic polyrotaxane, [Zn2(sdb)2(4-bpdb)]‧2DMF (1) 4,4′-sulfonyldibenzoate (sdb),4-bis(4- pyridyl)-3,4-diaza-1,3-butadiene (4-bpdb), possesses channels that could in situ encapsulate and remove dieldrin as a harmful organochlorine insecticide to form a host-guest system. pH stability, strong luminescence nature, very sensitive and complete quenching in presence of dieldrin introduce 1 as a precious sensor for dieldrin