Homoleptic CoII, NiII, CuII, and ZnII Complexes Based on 8‐Hydroxylquinoline Schiff Base Derivative: a Combined Synthetic, Spectral, Structural, and Magnetic Study. Issue 43 (16th November 2018)

• Record Type: Journal Article
• Authors: González, Déborah; Arrué, Ramón; Matamala‐Cea, Edison; Arancibia, Rodrigo; Hamon, Paul; Cador, Olivier; Roisnel, Thierry; Hamon, Jean‐René; Novoa, Néstor
• Is Part Of: European journal of inorganic chemistry. Issue 43(2018)
• Page Start: 4720
• Page End: 4730
• Publication Date: 2018-11-16
• Subjects: ONN ligands -- Schiff bases -- Homoleptic complexes -- X‐ray diffraction -- Hirshfeld surface analysis; Chemistry, Inorganic -- Periodicals; Organometallic chemistry -- Periodicals; Bioinorganic chemistry -- Periodicals; Solid state chemistry -- Periodicals; 546
• DOI: 10.1002/ejic.201801160
• Languages: English
• ISSNs: 1434-1948

Abstract

Abstract : A series of four new homoleptic Co II, Ni II, Cu II and Zn II 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 1 H and 13 C NMR spectroscopy (for the diamagnetic speciesH2 L and Zn II complex4 ). The molecular structures ofH2 L and its Ni II and Zn II complexes2 and4, respectively, were further confirmed by single‐crystal X‐ray diffraction methods. X‐ray crystal structure determination revealed that in complex2, the six‐coordinate Ni II metal ion adopts a N4 O2 distorted octahedral geometry with the two tridentate HL – ligands coordinated in a perfect orthogonal fashion. In complex4, however, the Zn II metal center is pentacoordinate and lies in a distorted N3 O2 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 Co II ( S = 3/2), Ni II ( S = 1) and Cu II ( S = 1/2) isolated spins at room temperature with no interaction between magnetic centers on cooling. Abstract : Four transition metal complexes bearing a O, N, N –donor 8‐hydroxylquinoline Schiff base ligand were efficiently synthesized, and their spectroscopic, structural, Hirshfeld surface and magnetic properties have been investigated.