Homoleptic Co II , Ni II , Cu II , and Zn II Complexes Based on 8-Hydroxylquinoline Schiff Base Derivative: a Combined Synthetic, Spectral, Structural, and Magnetic Study

Abstract : A series of four new homoleptic CoII, NiII, CuII and ZnII complexes (1–4) of the type M(HL)2, where HL– stands for the deprotonated form of the tridentate O,N,N‐donor Schiff base ligand obtained by condensation between 8‐hidroxy‐2‐quinolinecarboxaldehyde and 2‐aminophenol, have been prepared in yields ranging from 70 to 85 %. The five compounds were characterized using elemental analysis, FT‐IR, ESI‐MS, UV/Vis, and 1H and 13C NMR spectroscopy (for the diamagnetic species H2L and ZnII complex 4). The molecular structures of H2L and its NiII and ZnII complexes 2 and 4, respectively, were further confirmed by single‐crystal X‐ray diffraction methods. X‐ray crystal structure determination revealed that in complex 2, the six‐coordinate NiII metal ion adopts a N4O2 distorted octahedral geometry with the two tridentate HL– ligands coordinated in a perfect orthogonal fashion. In complex 4, however, the ZnII metal center is pentacoordinate and lies in a distorted N3O2 trigonal bipyramidal environment, one HL– ligand acting as an O,N‐bidentate ligand. In both cases, a free hydroxyl unit remains available for supramolecular interactions. Hirshfeld surface (HS) analysis along with 2D fingerprint plots were employed to consider the intermolecular forces, including hydrogen bonds and π–π stacking interactions, and their quantification in the crystal lattice. SQUID magnetometry experiments showed high spin CoII (S = 3/2), NiII (S = 1) and CuII (S = 1/2) isolated spins at room temperature with no interaction between magnetic centers on cooling.
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Déborah González, Ramon Arrue, Edison Matamala-Cea, Rodrigo Arancibia, Paul Hamon, et al.. Homoleptic Co II , Ni II , Cu II , and Zn II Complexes Based on 8-Hydroxylquinoline Schiff Base Derivative: a Combined Synthetic, Spectral, Structural, and Magnetic Study. European Journal of Inorganic Chemistry, Wiley-VCH Verlag, 2018, 2018 (43), pp.4720-4730. ⟨10.1002/ejic.201801160⟩. ⟨hal-01945150⟩

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