Structural and Magnetic Characterization of a Linear Trinuclear Copper Complex Formed through Ligand Sharing

Abstract

Reaction of bis(2-hydroxybenzyl)-1,3-diamino-2-propanol (H 2 bhbdp) with copper perchlorate in methanol leads to the assembly of a trinuclear complex with the general formula [Cu 3 (bhbdp) 2 (CH 3 OH) 2 (ClO 4 ) 2 ] (1). The complex was characterized by X-ray crystallography, Ligand Field, IR and ESR spectroscopy, and magnetic susceptibility. The structure of the complex contains a linear trinuclear array of copper ions [the Cu(1)−Cu(2)−Cu(1a) angle is 180°by symmetry], in octahedral, square planar and octahedral environments, respectively. The external Cu1 and Cu1a centers are coordinated

A computational study of structural and magnetic properties of bi- and trinuclear Cu(II) complexes with extremely long Cu---Cu distances

“…between the corresponding singly-occupied molecular orbitals (so-called SOMOs), determines the type of coupling -ferromagnetic when the ground electronic state corresponds to the high-spin configuration with parallel orientation of electronic spins and antiferromagnetic when the ground electronic state is characterized by the low total spin with antiparallel orientation of the electronic spins [1,2]. Nowadays, the most prevalent and well studied organometallic magnetic systems are dinuclear copper(II) complexes with different types of linkers between the ligand-coordinated magnetic centers (-Hal-, [6,7], -OH-, [4,6,8,9] -OR-, [10][11][12][13] CN-, [14] -N^N-, [8,9,15] -N^O- [16,17] etc.). These complexes can demonstrate a variety of coupling types from strongly antiferomagnetic (exchange coupling constant J CuCu is strongly negative up to -1000 cm -1 ) [4][5][6] to moderately ferromagnetic (J CuCu is positive, typically of order 100 cm -1 ) [10,18].…”

Synthesis, crystal structure and magnetic characterization of a novel linear trinuclear copper(II) complex bridged by phenoxy and benzyloxy oxygen atoms

“…In the present work, a linear trinuclear copper(II) ([Cu 3 L 2 ](ClO 4 ) 2 Á (CH 3 CN) 2 , L = C 11 H 13 BrN 2 O 2 2-) was synthesized (Scheme 1) and characterized, in which two N 2 O 2 units coordinate to all three coppers to form different environments of metal ions. The coordination structure of the copper(II) in the complex is very similar to the one reported by Reedijk [9]. The difference between the two complexes is that they have different ligands in which the former is an unsymmetric structure while the latter is a symmetrical structure.…”

“…The absorption coefficient (l) is 3.913 mm -1 and the index ranges are: (2) [9] in spite that they have different ligands and linked fashion. Each ligand in complex B only coordinates to two copper(II) cations, while the ligands in complex A coordinated to all three copper(II) ions.…”

“…Among the known linear trinuclear copper(II) complexes characterized by X-ray diffraction techniques, the bridging group between the Cu(II) ions are commonly an oxygen [8,9] or mixed (N, Cl, O) [10][11][12], and most of oxygen atoms bridged complexes are made up of two bidentate ligands of mononuclear copper(II) and a central copper(II) coordinated with the two bidentate ligands of mononuclear copper(II), which leads to trinuclear species [13,14]. The magnetic properties of this kind of complexes varied greatly with the distance between the neighboring copper(II) ions, the bridge group and the coordination environment.…”

Hydrothermal Synthesis, Crystal Structures, and Properties of a Class of 2D Coordination Polymers

“…The µ eff value is 3.28 µ B at room temperature, which slightly exceeds the value expected for three independent copper() ions (3.00 µ B ). The value of µ eff decreases upon cooling, reaching a value of 2.07 µ B at 5 K. A number of trinuclear copper compounds have been reported and classified from a structural point of view as linear, [23] isosceles triangle, [24] equilateral triangle, [25] and angular trinuclear. [26] The trinuclear copper center in compound 1 can be taken as an isosceles triangle array, therefore an equation that uses two different J values was tried.…”