Multi‐Dimensional Cobalt(II) and Nickel(II) Coordination Polymers

Abstract

Abstract A series of metal coordination polymers, [Co 2 (NB) 4 (bpp) 2 (H 2 O)]·H 2 O ( 1 ), [Co 2 ( e , e‐trans ‐chdc)( e , a‐cis ‐chdc)(bpp) 2 ] ( 2 ), [Ni( e , e‐trans ‐chdc)(bpp)(H 2 O) 2 ] ( 3 ), [Ni 2 (PDA) 2 (bpp) 2 (H 2 O) 3 ]·H 2 O ( 4 ), and [Ni‐(mBDC)(bpp)] ( 5 ) (NB = 3‐nitrobenzoate anion; bpp = 4,4′‐trimethylene dipyridine; chdc = cyclohexane‐1,4‐dicarboxylate anion; PDA = 1,4‐phenylenediacetate anion; mBDC = 1,3‐benzene dicarboxylate anion), were synthesized from metal ions and organic mixed‐ligands by hydrothermal reactions. The single crystal structure analysis revealed that 1, 3, and 4 were 2D sheets with bilayer (1 and 4) and 2‐fold interpenetrated layers (3), 2 is a 3D binodal (4,5)‐connected framework, and 5 is a 1D chains. The non‐covalent interactions of H‐bonds and π–π stacking caused this conformation of highly cross‐linked networks. Compounds 1‐5 were further characterized by thermal gravimetric analysis, powder X‐ray diffraction, UV‐vis, infrared, and PL spectroscopy.