Self-assembly of the rigid rodlike ligandN,N′-4,4′-diphenylethynebis(oxamate) (dpeba) and Cu2+ions affords a novel dinuclear copper(II) metallacyclophane(nBu4N)4[Cu2(dpeba)2]·4MeOH·2Et2O (1) featuringa very long intermetallic distance (r = 15.0 Å).Magnetic susceptibility measurements for 1 reveal amoderately weak but nonnegligible intramolecular antiferromagneticcoupling between the two metal centersacross the double para-substituted diphenylethynediamidatebridge (J = −3.9 cm−1; H = −JS1S2, where S1 = S2 =SCu = 1/2). Density functional electronic structure calculations on 1 support the occurrence of a spin polarization mechanism.
Very Long-Distance Magnetic Coupling in a Dicopper(II) Metallacyclophane with Extended π-Conjugated Diphenylethyne Bridges
Armentano D
;DE MUNNO, Giovanni;
2011-01-01
Abstract
Self-assembly of the rigid rodlike ligandN,N′-4,4′-diphenylethynebis(oxamate) (dpeba) and Cu2+ions affords a novel dinuclear copper(II) metallacyclophane(nBu4N)4[Cu2(dpeba)2]·4MeOH·2Et2O (1) featuringa very long intermetallic distance (r = 15.0 Å).Magnetic susceptibility measurements for 1 reveal amoderately weak but nonnegligible intramolecular antiferromagneticcoupling between the two metal centersacross the double para-substituted diphenylethynediamidatebridge (J = −3.9 cm−1; H = −JS1S2, where S1 = S2 =SCu = 1/2). Density functional electronic structure calculations on 1 support the occurrence of a spin polarization mechanism.File in questo prodotto:
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