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- W2049661624 abstract "Abstract Three triple helical binuclear complexes [Ni 2 (L 1 ) 3 ] · (ClO 4 ) 4 · (H 2 O) 3 ( 1 ) (L 1 = 1,4-bis(2-pyridyl)-1-amino-4-methyl-2,3-diaza-1,3-butadiene), [Ni 2 (L 2 ) 3 ] · (ClO 4 ) 4 · (H 2 O) 3 ( 2 ) (L 2 = 2,5-bis(2-pyridyl)-3,4-diaza-2,4-hexadiene) and [Mn 2 (L 1 ) 3 ] · (ClO 4 ) 4 · (H 2 O) 3 ( 3 ) have been studied, where the L i ligand possesses a rotationally flexible single N–N bond. In complexes 1 – 3 , the three bis(bidentate) diazine ligands wrap around two metal cations with a spiral conformation, leading to a triple helicate with C 3 symmetry. Magnetic investigations revealed that antiferromagnetic interactions are operative between the two metal ions linked by the triple diazine bridges, with J = −2.97 and −5.40 cm −1 for 1 and 2 , respectively. Variable temperature magnetic data for 3 indicates a weak ferromagnetic interaction between the two manganese(II) centers with J = 1.24 cm −1 . The X-ray powder diffraction of 3 is also discussed." @default.
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- W2049661624 date "2006-10-01" @default.
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- W2049661624 title "Crystal structures and magnetic properties of triple helical binuclear complexes with bis(bidentate) diazine ligands" @default.
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- W2049661624 doi "https://doi.org/10.1016/j.poly.2006.04.008" @default.
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