Synthesis, characterization and liquid crystalline properties of novel benzimidazol-8-hydroxyquinoline complexes

• Published in: Inorganica Chimica Acta Vol. 466; pp. 612 - 617
• Main Authors: Al-Noor, Taghreed H., Karam, Nisreen H., H. Ghanim, Faeza, Kindeel, Alia S., Al-Dujaili, Ammar H.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.09.2017; Elsevier Science Ltd
• Subjects: 8-Hydroxyquinoline; Benzimidazol; Chemical synthesis; Coordination compounds; Copper; Crystal structure; Crystallinity; Crystallization; Differential scanning calorimetry; Fourier transforms; Hydroxyquinoline; Infrared analysis; Ligands; Liquid crystal; Liquid crystals; Magnetic permeability; Manganese; Metal heterocyclic; Nickel; NMR; Nuclear magnetic resonance; Optical properties; Phase transitions; Studies; Transition metal-complexes; 8-Hydroxyquinoline; Liquid crystal; Metal heterocyclic; Benzimidazol; Transition metal-complexes
• ISSN: 0020-1693; 1873-3255
• DOI: 10.1016/j.ica.2017.07.029

A new complexes of N4,N4′-bis((1H-benzo[d]imidazol-2-yl)methyl)-3,3′-dimethyl-[1,1′-biphenyl]-4,4′-diamine and of their corresponding Mn(II), Fe(II), Ni (II), Cu(II), and Zn(II) complexes were synthesized. The liquid crystalline properties of ligands and complexes were examined by DSC and POM. [Display omitted] •A novel Mn(II), Fe(II), Ni (II), Cu(II), and Zn(II) complexes were synthesized.•The ligands and Cu(II), and Zn(II) complexes exhibit liquid crystalline properties.•The liquid crystals has been analyzed in terms of structure-property relationship. The synthesis, characterization and liquid crystalline properties of N4,N4′-bis((1H-benzo[d]imidazol-2-yl)methyl)-3,3′-dimethyl-[1,1′-biphenyl]-4,4′-diamine and of their corresponding Mn(II), Fe(II), Ni (II), Cu(II), and Zn(II) complexes are described. The ligand and complexes have been characterized by elemental analysis, magnetic susceptibility measurements (µeff), conductometric measurements and Fourier Transform Infrared (FTIR), Nuclear Magnetic Resonance (1H NMR), (13C-NMR) and UV–Vis spectroscopy. Spectral investigations suggested octahedral coordination geometrical arrangement for M(II) complexes. The phase transition temperatures were detected by differential scanning calorimetry (DSC) analysis and the phases are confirmed by optical polarizing microscopy (POM). The DSC and POM supported the mesomorphic properties of the uncoordinated ligand in which the enantiotropic smectic phases were recorded. However, not all of their corresponding M(II) complexes are liquid crystal.