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- W2013286848 abstract "Sterically bulky pyrazines have been successfully utilized for the preparation of discrete oligo-nuclear TBP (trigonal bipyramidal), SqP (square pyramidal), and Oh (octahedral) copper(II) complexes. We have synthesized a unique linear pentanuclear complex [{Cu(hfac)2}5(μ-2-butyl-3-methylpyrazine)4]. The two terminal copper(II) ions have a SqP structure while the three inner ions have an Oh one. The solvent molecule was incorporated in the clearance of the lattice. From another reaction under harsh conditions, we separated [{Cu(hfac)2}3(μ-2-butyl-3-methylpyrazine)2], which can be regarded as the central moiety of the pentanuclear one. We also prepared a dinuclear complex [{Cu(hfac)2}2(μ-tetramethylpyrazine)], in which the pyrazine nitrogen atoms were located at TBP equatorial positions. Single-crystal EPR measurements supported its compressed TBP structure. The exchange coupling was antiferromagnetic with JTBP–TBP/kB = −3.6 K. The linear trinuclear [{Cu(hfac)2}3(μ-2,3,5-trimethylpyrazine)2], having two TBP Cu ions with an intervening Oh Cu ion, showed very weak antiferromagnetic coupling. DFT calculations on these compounds indicated that the σ-type orbital overlap between the Cu and N atoms is essential for superexchange interactions." @default.
- W2013286848 created "2016-06-24" @default.
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- W2013286848 date "2008-08-01" @default.
- W2013286848 modified "2023-09-24" @default.
- W2013286848 title "A pyrazine-bridged linear pentanuclear copper(II) complex and related tri- and dinuclear complexes showing various coordination structures and magnetic couplings" @default.
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- W2013286848 doi "https://doi.org/10.1016/j.poly.2008.04.040" @default.
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