Hydrogen bonding supramolecular networks of copper(II) 2-choronicotinate complexes with picolinamide, nicotinamide, N-methyl-nicotinamide, 2-pyridylmethanol and 4-pyridylmethanol: Hirshfeld surface analysis and spectral properties

The crystal and molecular structure of copper(II) 2-chloronicotinate (2-Clnic) of the composition [Cu(2-Clnic)2(pia)2] (pia = Picolinamide) (1), [Cu(2-Clnic)2(nia)2] (nia = Nicotinamide) (2), [Cu(2-Clnic)2(nia)2(H2O)]·H2O (3), [Cu(2-Clnic)2(mna)2(H2O)2] (mna = N-methylnicotinamide) (4), [Cu(2-Clnic)2(2 pm)2] (2 pm = 2-Pyridylmethanol) (5), and [Cu(2-Clnic)2(4 pm)2(H2O)2]·2H2O (4 pm = 4-Pyridylmethanol) (6) were determined by single-crystal X-ray analysis. Crystal structures of the respective complexes are monomeric with a different composition of coordination sphere about Cu(II) atom. The arrangement about Cu(II) in all coordination compounds are pseudooctahedral trans-coordinated, where carboxylic groups are bidentate (2,3) or monodentate (1,3–6) coordinated to atom copper. The molecules of all compounds are connected by strong N–H···O, N–H···N and/or O–H···O hydrogen bonds. EPR spectra of powder complexes 1–6 were measured and computer-simulated.