Abstract
Copper(II) complexes with 2,3,4-trimethoxybenzoic acid (H234-tmbz) and 2,4,6-trimethoxybenzoic acid (H246-tmbz), [Cu2(234-tmbz)4(H2O)2] (6) and [Cu(246-tmbz)2(µ-H2O)2(H2O)2]n (7), were synthesized and characterized by elemental analysis, infrared and UV-vis spectra and temperature dependence of magnetic susceptibilities (1.9–300 K). The X-ray crystal structures revealed that the former 6 is a dinuclear cluster having syn-syn-bridged Cu2(µ-234-tmbz)4 core with Cu···Cu separation of 2.6009(7) Å, while the latter 7 is a µ-aqua-bridged chain molecule consisting of Cu(246-tmb)2(µ-H2O)2(H2O)2 units with Cu···Cu separation of 4.1420(5) Å. Temperature dependence of magnetic susceptibilities showed that an antiferromagnetic interaction with 2J = −272 cm−1 for 6 and a weak antiferromagnetic interaction with J = −0.21 cm−1 for 7, between the two copper(II) ions. The adsorption isotherm of 6 showed Types I behavior having a 125.4 m2g−1 of specific surface area.
Highlights
Copper acetate is known as one of the oldest compounds as dinuclear metal clusters and became popular since the discovery of the paddle-wheel or lantern-type dinuclear core with four syn-syn bridging acetate ligands for the two copper(II) ions, which interact with each other by an antiferromagnetic spin-coupling [1,2]
1-D coordination polymers can be formed with linking ligands, which connect the axial sites of the dinuclear clusters
Carboxylates to that described for the dinuclear cluster [Cu2 (345-tmbz)4 (CH3 OH)2 ] (2) [16]
Summary
Copper acetate is known as one of the oldest compounds as dinuclear metal clusters and became popular since the discovery of the paddle-wheel or lantern-type dinuclear core with four syn-syn bridging acetate ligands for the two copper(II) ions, which interact with each other by an antiferromagnetic spin-coupling [1,2]. Dinuclear clusters with the paddle-wheel or lantern-type core have been found to have a general formula [Cu2 (RCOO) L2 ] (L = H2 O, CH3 OH, DMF, CH3 CN, etc.), forming discrete dinuclear carboxylates and their adducts. 1-D coordination polymers can be formed with linking ligands, which connect the axial sites of the dinuclear clusters. We found that a chain compound of copper(II)
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