Search

A new salt, [NO2BzDMAP]3[Cu2Cl7] · H2O (1), has been synthesized, where [NO2BzDMAP]+ is 1-(4′-nitrobenzyl)-4-dimethylaminopyridinium. Herein, the synthesis, spectral and structural characterization, and magnetic behavior of 1 are reported. It is orthorhombic, with space group Pca21, and a = 26.639(2) Å, b = 9.638(1) Å, and c = 20.011(2) Å with V = 5137.5(7) Å3 for Z = 4. The anion shows a chloride-bridged binuclear structure with Cu ··· Cu distance of 3.872 Å; the two Cu(II) ions have a tetrahedral geometry. The cations stack through p ··· π and π ··· π interactions, and a complicated hydrogen-bonding network structure is formed through C–H ··· Cl and C–H ··· O hydrogen bonds. The variable temperature magnetic susceptibility measurements reveal that 1 exhibits strong antiferromagnetic interaction with J = −193.0 cm−1. [ABSTRACT FROM AUTHOR]

Two new salts, [2-NaMePy]2[Ni(i-mnt)2] (1) and [2-NaMe-4-MePy]2[Ni(i-mnt)2] (2) ([2-NaMePy]+ = 1-(2'-naphthylmethyl)pyridinium, [2-NaMe-4-MePy]+ = 1-(2'-naphthylmethyl)-4-methylpyridinium and i-mnt2- = iso-maleonitriledithiolate), have been prepared and characterized by elemental analyses, UV, IR, molar conductivity, and single crystal X-ray diffraction. The anions in 1 form a 1-D chain through short C ··· N interactions between the anions, while the cations in 2 stack a 1-D column via C-H ··· π and π ··· π stacking interactions between the cations. The effect of weak intramolecular interactions such as C-H ··· N, C-H ··· S, C-H ··· Ni hydrogen bonds, and π ··· π stacking interactions between the cations and the anions further generate a 3-D network structure. The change of the molecular topology of the countercation when the 4-substituted group in the pyridine ring is changed from H atom to CH3 group results in different crystal system, space group, and the stacking mode of the cations and anions of 1 and 2. [ABSTRACT FROM AUTHOR]

Complexes [Ni(H 2 O) 6 (ML) 2 ]· n H 2 O (M = Cu, Ni; L = Schiff base derived from glycylglycine and salicylaldehyde, C 11 H 9 N 2 O 4 ) were synthesized and characterized. The [Ni(H 2 O) 6 (CuL) 2 ]·10H 2 O complex 1 crystallized in the space group , with a = 7.217(1), b = 11.674(1), c = 12.678(1) Å, α = 66.56(1), β = 76.60(1), γ = 80.46(1)°, and Z = 1. The [Ni(H 2 O) 6 (NiL) 2 ]·2H 2 O complex 2 crystallized in the group P 2(1)/ c , with a = 10.564(2), b = 20.246(4), c = 6.965(2) Å, β = 103.14(1)°, and Z = 2. Hydrogen bonding involving [ML] - , Ni(H 2 O) 6 2+ and molecular water forms a three-dimensional (3D) supermolecule. The determination of variable-temperature magnetic susceptibilities indicates an antiferromagnetic interaction between the metallic atoms of 1 , and a corresponding ferromagnetic interaction for 2 . [ABSTRACT FROM AUTHOR]