Abstract
Dicopper(II) complexes [Cu 2L(O 2CC 6H 4- o-NH 2)] ( 1) and [Cu 2L(O 2CC 6H 4- p-NH 2)] ( 2) are prepared from a reaction of [Cu 2L(O 2CMe)] with the corresponding aminobenzoic acid and a base in MeOH, where L is a trianionic pentadentate Schiff base ligand N, N′-(2-hydroxypropane-1,3-diyl)bis(salicylaldimine). The complexes are structurally characterized by X-ray crystallography. The crystal structures show the presence of an asymmetrically dibridged {Cu 2 II(μ-OR)(μ-O 2CR)} core where the endogenous mono-atomic bridging alkoxo group is derived from the Schiff base and the aminobenzoate ligand displays syn–syn bridging mode. The Cu⋯Cu separation and Cu–OR–Cu bond angle in 1 and 2 are 3.472(1) Å, 131.02(18)° and 3.511(1) Å, 132.20(17)°, respectively. The o-aminobenzoate complex is discrete dimeric nature. The pendant o-amino group is involved in an intramolecular hydrogen bonding interaction with one carboxylate oxygen atom. The crystal structure of the p-aminobenzoate species 2 shows the formation of a one-dimensional polymeric chain resulting from the axial binding of the pendant p-amino group to one copper center belonging to another dimeric unit. Magnetic studies show that both the complexes are antiferromagnetic in nature giving a singlet–triplet energy separation of −130 and −150 cm −1 for 1 and 2, respectively. The 1D chain complex 2 magnetically behaves like the discrete dimeric complex 1.
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