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• W1968399080 abstract "The compounds trans-{(μ1,3-N3)[Ni(meso-cth)]}n(ClO4)n (1) and trans-{(μ1,3-N3)[Ni(meso-cth)]}n(PF6)n (2), in which meso-cth is the meso isomer of 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane, have been synthesised by reaction of the corresponding [Ni(meso-cth)](ClO4)2 with azido ligand in aqueous medium. Crystal structures of 1 and 2 have been solved. Compound 1 crystallises in the orthorhombic system, group Pnab, a=12.134(3) Å, b=16.107(4) Å, c=34.527(7) Å, V=6748 (3) Å3, Z=12, R=0.058. In the unit cell of 1 there are two different chains A and B in ratio 2:1. Compound 1 shows two structural transitions centred at 288 and 137 K, giving the compounds 1b and 1c with small differences in crystallographic parameters. Complex 2 crystallises in the orthorhombic system, group Pcnb, a=11.756(3) Å, b=12.292(4) Å, c=16.381(3) Å, V=2367.1(11) Å3, Z=4, R=0.046. Magnetic measurements have been performed for the two compounds, showing strong antiferromagnetic coupling in 1 and moderate coupling in 2. The J parameters found from the best fit of the experimental data for 1 are JA=−43.9 cm−1 and JB=−39.7 cm−1 in the range 300–137 K and JA=−39.9 cm−1 and JB=−40.0 cm−1 in the range 137–170 K and J=−21.1 cm−1 for 2. Magnetic results, which are well-correlated to the structural parameters (mainly bonds and torsion angles), show good agreement with the model previously reported by the authors. The Haldane gap has been calculated for compound 1." @default.
• W1968399080 created "2016-06-24" @default.
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• W1968399080 date "2003-02-01" @default.
• W1968399080 modified "2023-10-18" @default.
• W1968399080 title "Synthesis, structural characterisation and magnetic behaviour of two new 1-D trans-(μ1,3-N3)nickel(II) compounds. Observation of magnetic transition at 288 and 137 K and determination of the Haldane gap for the trans-{(μ1,3-N3)[Ni(meso-cth)]}n(ClO4)n compound" @default.
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• W1968399080 doi "https://doi.org/10.1016/s0020-1693(02)01281-1" @default.
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