A series of hydrogen bond mediated dinuclear nickel(II) complexes with reduced Schiff base ligands: An insight into the nature of their short intermolecular hydrogen bonds. (15th March 2020)

• Record Type: Journal Article
• Authors: Mirdya, Saikat; Drew, Michael G.B.; Chandra, Akash Kumar; Banerjee, Abhisek; Frontera, Antonio; Chattopadhyay, Shouvik
• Is Part Of: Polyhedron. Volume 179(2020)
• Publication Date: 2020-03-15
• Subjects: Dinuclear -- Nickel -- Reduced Schiff base -- Hydrogen bond -- DFT; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2020.114374
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: Four hydrogen bonded dimeric nickel(II) complexes with reduced Schiff base blocking ligands were synthesized and characterized. The energy of these hydrogen bonds has been estimated by DFT calculation. The energy associated to the low barrier hydrogen bond is found to be very large due to the strong covalent character of the interaction. Abstract: A series of isostructural centrosymmetric hydrogen bonded dimeric nickel(II) complexes of general formula, [Ni2 (HL)2 (DMSO)2 (H2 O)2 ]X {where H2 L = N2 O4 donor reduced Schiff base ligand, [H2 L 1 =(2, 2-dimethyl-1, 3-propanediyl)bis(iminomethylene)bis(6-methoxyphenol) and H2 L 2 =(2, 2-dimethyl-1, 3-propanediyl)bis(iminomethylene)bis(6-ethoxyphenol)] and X = counter anion}, are synthesized and characterized by elemental analysis, infrared and electronic spectra. The structures of all complexes have been confirmed by single crystal X-ray diffraction analysis. Each complex forms O⋯H⋯O hydrogen bonded dimer in the solid state, where the O⋯O distance is very short, ranging from 2.424(3) to 2.437(3) Å. The hydrogen bonds are very strong as can be seen from the DFT estimated energy of these hydrogen bonds. Non-covalent interaction plot (NCI plot) index has been used to characterize them.