Polytorsional-amide/carboxylates-directed Cd(ii) coordination polymers exhibiting multi-functional sensing behaviors.

By rational assembly of polytorsional-amide [ N , N '-bis(4-methylenepyridin-4-yl)-1,4-naphthalene dicarboxamide (L)] and polytorsional-carboxylates [H ₂ ADI = adipic acid, H ₂ PIM = pimelic acid, H ₂ SUB = suberic acid], three new Cd-based coordination polymers (CPs) C ₃₀ H ₃₀ CdN ₄ O ₇ (1), C ₃₁ H ₃₂ CdN ₄ O ₇ (2) and C _31.03 H _30.55 CdCl _0.24 N ₄ O _5.52 (3) were successfully synthesized. CPs 1-2 and 3 are 2D networks and a 3D framework, which all display 3,5-connected topologies with different structural details. The effects of carboxylates with different carbon chains on the structure of the complexes were studied. Fluorescence experiments show that CPs 1-3 have good multi-functional sensing ability for metal cations (Fe ³⁺ ), anions (MnO ₄ ^- , CrO ₄ ^2- , Cr ₂ O ₇ ^2- ) and organochlorine pesticides (2,6-dichloro-4-nitroamine) with good anti-interference and recyclable characteristics. The possible sensing mechanism is also investigated in detail.
Competing Interests: The authors declare no competing financial interest.
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