Cycloaddition of salicylaldehyde to nitrile: Synthesis and characterization of new macrocyclic copper(II) complexes bearing a heterobicyclic functional pendant arm

Two alkoxo‐bridged copper(II) tridentate Schiff base complexes [{Cu(H2L1)}4] (1) [H2L1 = N‐(2‐hydroxyethyl)‐3,5‐di‐tert‐butylsalicylaldimine] and {Cu(H2L2)}4 (2) [H2L2 = N‐(2‐hydroxyethyl)‐4‐methoxysalicylaldimine] have been synthesized and structurally and magnetically characterized. X‐ray diffraction studies show that 1 and 2 are tetranuclear alkoxo‐bridged copper(II) complexes that contain a rather distorted Cu4O4 cubane core of 4+2 type (four short and two long Cu···Cu distances). The coordination of each copper ion can be described as a distorted square pyramid with one nitrogen and four oxygen atoms from three ligands. Variable‐temperature magnetic susceptibility measurements on the two tetranuclear complexes 1 and 2 in the range 2–300 K indicate ferromagnetic exchange coupling between copper(II) centers. The magnetic susceptibility data were analyzed by using a simple two‐J model with J′ and J″ representing the magnetic exchange couplings through the short and long Cu···Cu exchange pathways, respectively. The J values were as follows: J′ = +28.7 cm–1 and J″ = +7.8 cm–1 for 1, and J′ = +39.8 cm–1 and J″ = +10.2 cm–1 for 2. The sign and magnitude of the exchange coupling constants were justified on the basis of the structural geometric factors of the bridging Cu(O)2Cu fragments, the overlap of the magnetic orbitals, and DFT calculations.

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Two Tetranuclear Copper(II) Complexes with Open Cubane‐Like Cu₄O₄ Core Framework and Ferromagnetic Exchange Interactions between Copper(II) Ions: Structure, Magnetic Properties, and Density Functional Study

Güngör

Kara

Colacio

et al. 2014

Eur J Inorg Chem

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Photoluminescence and Magnetism Study of Blue Light Emitting the Oxygen-Bridged Open-Cubane Cobalt(II) Cluster

et al. 2018

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Reduction of nitrile to primary amine using sodium borohydride: Synthesis and protonation of a cis-octahedral macrocyclic nickel(II) complex bearing two 2-aminoethyl pendant arms

Bang

Kim

Jang

et al. 2016

Inorganica Chimica Acta

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Cycloaddition of salicylaldehyde to nitrile: Synthesis and characterization of new macrocyclic copper(II) complexes bearing a heterobicyclic functional pendant arm

Cited by 10 publications

References 29 publications

Two Tetranuclear Copper(II) Complexes with Open Cubane‐Like Cu₄O₄ Core Framework and Ferromagnetic Exchange Interactions between Copper(II) Ions: Structure, Magnetic Properties, and Density Functional Study

Two Tetranuclear Copper(II) Complexes with Open Cubane‐Like Cu₄O₄ Core Framework and Ferromagnetic Exchange Interactions between Copper(II) Ions: Structure, Magnetic Properties, and Density Functional Study

Photoluminescence and Magnetism Study of Blue Light Emitting the Oxygen-Bridged Open-Cubane Cobalt(II) Cluster

Reduction of nitrile to primary amine using sodium borohydride: Synthesis and protonation of a cis-octahedral macrocyclic nickel(II) complex bearing two 2-aminoethyl pendant arms

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Cycloaddition of salicylaldehyde to nitrile: Synthesis and characterization of new macrocyclic copper(II) complexes bearing a heterobicyclic functional pendant arm

Cited by 10 publications

References 29 publications

Two Tetranuclear Copper(II) Complexes with Open Cubane‐Like Cu4O4 Core Framework and Ferromagnetic Exchange Interactions between Copper(II) Ions: Structure, Magnetic Properties, and Density Functional Study

Two Tetranuclear Copper(II) Complexes with Open Cubane‐Like Cu4O4 Core Framework and Ferromagnetic Exchange Interactions between Copper(II) Ions: Structure, Magnetic Properties, and Density Functional Study

Photoluminescence and Magnetism Study of Blue Light Emitting the Oxygen-Bridged Open-Cubane Cobalt(II) Cluster

Reduction of nitrile to primary amine using sodium borohydride: Synthesis and protonation of a cis-octahedral macrocyclic nickel(II) complex bearing two 2-aminoethyl pendant arms

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Product

Resources

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Two Tetranuclear Copper(II) Complexes with Open Cubane‐Like Cu₄O₄ Core Framework and Ferromagnetic Exchange Interactions between Copper(II) Ions: Structure, Magnetic Properties, and Density Functional Study

Two Tetranuclear Copper(II) Complexes with Open Cubane‐Like Cu₄O₄ Core Framework and Ferromagnetic Exchange Interactions between Copper(II) Ions: Structure, Magnetic Properties, and Density Functional Study