Anion-controlled isostructurality and structural diversity in cadmium coordination polymers of 2-aminobenzonitrile

Using 2-aminobenzonitrile (2-ABN) and different anions, four one-dimensional coordination polymers of the formulae [Cd(2-ABN)2Br2]n (1), [Cd(2-ABN)2I2]n (2), [Cd(2-ABN)(H2O) (NO3)2]n (3), and {[Cd(2-ABN)2(H2O)2] (ClO4)2}n (4) were synthesized and structurally characterized by FT-IR, PXRD, TGA, Elemental analysis and single-crystal X-ray diffraction. According to our structural analysis, the 2-aminobenzonitrile ligand can act as a monodentate and bridge mu 2-N,N ' ligand. In isostructural compounds 1 and 2, the 2-ABN ligand was coordinated only through the Nnitrile to the metal center and a 1D ribbon chain is obtained through bridged halide anions. While compound 3 and 4 includes 1D helical and double chain structural motif due to the (mu 2-N,N ') ligand coordination mode, respectively. Our results prove that anions can play an essential role in the final structural motif of cadmium coordination polymers. Also, Hirshfeld surface analysis was performed to investigate intermolecular interactions in compounds 1-4.