Dinuclear alkoxo-bridged copper(II) coordination polymers: Syntheses, structural and magnetic properties

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

“…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. 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.…”

“…Both theoretical and experimental studies have shown that the major factor controlling the magnetic exchange interaction in dialkoxo-bridged dicopper(II) complexes is the value of the Cu-O-Cu angle (θ) finding that an almost linear variation of J with θ can generally be established. [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47] DFT calculations carried out on a dialkoxo-bridged model structure, containing a planar Cu 2 (μ-O 2 ) skeleton and a methyl group bonded to each oxygen atom of the double bridge, predicted antiferromagnetic interactions for the whole range of the Cu-O-Cu angle (θ) when τ values (out-of-plane displacement of the methyl carbon atom from the Cu 2 O 2 plane) were smaller than 40°. 43,44 Moreover, a correlation was established between θ and τ, showing that small values of θ are associated with the largest values of τ.…”

“…Recently, the synthesis, structural and magnetic properties for several linear trinuclear copper(II) complexes have been reported. [20][21][22][23][24][25][26][27][28][29] The magnetic behaviour of dihydroxo-and dialkoxo-bridged dinuclear copper(II) complexes is well known from the experimental [30][31][32][33][34][35][36][37][38][39][40] and theoretical studies. [41][42][43][44][45][46][47] The primary geometric factor determining the magnitude of the exchange coupling for these dinuclear complexes, the Cu-O-Cu bridging angle (θ), was established by Hatfield and co-workers: 30 the larger the θ angle the stronger the antiferromagnetic coupling between the copper(II) ions.…”

Structural diversity and magnetic properties of copper(ii) quinaldinate compounds with amino alcohols

“…The above listed properties combined with the commercial availability and low cost have strongly encouraged research on their coordination chemistry with transition metal ions including copper(II). 11 Studies with a number of aliphatic amino alcohols have been performed so far, e.g., 2aminoethanol 12 , N,N'-dimethylethanolamine 13 , 3-amino-1-propanol 10,12,[14][15][16][17][18][19][20] , diethanolamine [21][22][23] , Nmethyldiethanolamine [24][25][26] , N-butyldiethanolamine 13 , and triethanolamine 27,28 . The survey of the Cambridge Structural Database reveals that there are more complexes with amino alcoholate ions than with intact amino alcohols.…”

Synthesis and Structural Characterization of a Binuclear Mixed‐Ligand (Salicylate and N,N‐diethylnicotinamide) Nickel(II) Complex, Its Magnetic Properties. [Ni2(µ‐Sal)4(Dena)2]H2O

“…17 Among the reported transition metal hybrids, the binuclear copper units are known to be bridged by a wide variety of bridging ligands, such as chloro, azido, oxo, hydroxo, oxalato, carboxylate and so on. [18][19][20] The structure of frame was independent on the nature of the substituent in the carboxylic bridges but the magnetic properties strongly depended on the metal atom nature particularly on the electron spin of metal ion. 21,22 Nickel(II) carboxylates have been intensively studied due to their unusual magnetic properties Ni(II).…”