Luminescent Two-Dimensional Coordination Polymer for Selective and Recyclable Sensing of Nitroaromatic Compounds with High Sensitivity in Water

A stable
two-dimensional (2D) coordination Cd­(II) polymer [Cd­(ppvppa)­(1,4-NDC)]n (1) (ppvppa = N-(pyridin-2-yl)-N-(4-(2-(pyridin-4-yl)­vinyl)­phenyl)­pyridin-2-amine;
1,4-H2NDC = 1,4-naphthalenedicarboxylic acid) was prepared
by the solvothermal reactions of Cd­(NO3)2·4H2O with ppvppa and 1,4-H2NDC in H2O and
MeCN at 150 °C. Compound 1 was characterized by
elemental analysis, IR, powder X-ray diffraction (PXRD), and single crystal X-ray diffraction and thermogravimetric analysis (TGA). Compound 1 consists of dimeric [Cd2(μ-ppvppa)2] fragments linked by 1,4-NDC bridges to generate a 2D honeycomb
network. Complex 1 strongly emits blue light in the solid
state when excited at 419 nm at ambient temperature. This emission
is selectively quenched by nitro aromatic compounds in water with
good sensitivity. Compound 1 also displays recyclable
detection of nitro aromatic compounds.