Copper(II) Complexes of 3-Aminopropanols. Synthesis and Structure of Trimeric Tetrakis(3-aminopropanolato)tricopper(II) Nitrate.

Synthesis, crystal structures and magnetic properties of bis(μ-dialkoxo)-bridged linear trinuclear copper(ii) complexes with aminoalcohol ligands: a theoretical/experimental magneto–structural study

“…The central copper atom Cu1 and the terminal copper atoms Cu2 and Cu3 have distorted square pyramidal [Cu 3 (ap) 4 (NO 3 ) 2 ] (2). The structural parameters of 2 measured at 291 K, reported and discussed in detail previously, 48 are almost equivalent to the parameters measured at 100 K. The crystal structure of complex 2 has some similarities to that of 1, especially comparing the bonding parameters of the coordination spheres around the Cu(II) ions. The Cu2-Cu1-Cu3 angle is 175.78(2)°and the Cu1⋯Cu2 and Cu1⋯Cu3 distances are 2.9532(4) and 3.0294(4) Å, respectively.…”

“…The formation of the different copper(II) nitrate complexes with the 3-aminopropanolate anion was previously found to be dependent on the ratio between 3-aminopropanol and copper(II) nitrate. 48 Thus, pure crystals of the trinuclear complex 2 were obtained when the ap − : Cu ratio (ap − from Hap with N(Et) 3 ) was between 2.0-2.3. Moreover, the dependence of the final composition of complex 3 on the 3-aminopropanol to copper bromide ratio was also tested by varying the ap − : Cu ratio from 1.3 to 3.0.…”

“…It should be outlined at this point that only a few examples of trinuclear complexes containing exclusively alkoxo bridges between the copper(II) ions have been reported so far. [48][49][50][51][52][53][54][55][56][57][58][59] As far as we know, in five instances [55][56][57][58][59] the magnetic properties were reported, which showed strong antiferromagnetic coupling between the central and terminal copper(II) ions. Complexes 1 and 2 (with J values in the AF region) and complex 4 (the first example of a bis(μ-dialkoxo)-bridged trinuclear copper(II) exhibiting F interaction between the terminal and central copper(II) ions) have allowed the establishment of a theoretical magnetostructural correlation for the bis(μ-dialkoxo)-bridged trinuclear copper(II) that is able to predict the sign and magnitude of the exchange coupling of Cu(II) ions with complementarity effects between θ and τ angles.…”

“…Although a large number of dialkoxo-bridged dinuclear copper(II) complexes have been magneto-structurally studied, only a few dialkoxo-bridged trinuclear copper(II) complexes have been structurally characterised, [48][49][50][51][52][53][54][55][56][57][58][59] the description of their magnetic properties being even more limited. [55][56][57][58][59] Within this framework, and as an extension to our previous studies 39,40 on dinuclear dialkoxo-bridged copper(II) complexes, the syntheses, crystal structures and magnetic properties (both experimental and theoretical) of three new trinuclear bis(μ-dialkoxo)-bridged copper(II) complexes [Cu 3 (ap) 4 (ClO 4 ) 2 EtOH] (1), [Cu 3 (ap) 4 Br 2 ] (3) and [Cu 3 (ae) 4 (NO 3 ) 2 ] (4) (ae = 2-aminoethanolato and ap = 3-aminopropanolato) are presented.…”

“…[55][56][57][58][59] Within this framework, and as an extension to our previous studies 39,40 on dinuclear dialkoxo-bridged copper(II) complexes, the syntheses, crystal structures and magnetic properties (both experimental and theoretical) of three new trinuclear bis(μ-dialkoxo)-bridged copper(II) complexes [Cu 3 (ap) 4 (ClO 4 ) 2 EtOH] (1), [Cu 3 (ap) 4 Br 2 ] (3) and [Cu 3 (ae) 4 (NO 3 ) 2 ] (4) (ae = 2-aminoethanolato and ap = 3-aminopropanolato) are presented. Since the structural properties of [Cu 3 (ap) 4 (NO 3 ) 2 ] (2) were previously reported at 291 K without magnetic data, 48 the structural data at 100 K and magnetic properties of 2, are presented and discussed along with the structural and magnetic properties of 1, 3 and 4. Finally, we have studied if for these complexes a linear correlation could be established between the structural parameters (θ and τ angles) and the magnetic properties.…”