Synthesis, structure and magnetic properties of a new chloro-bridged dimeric copper complex, bis(μ-chloro)bis(8-amino-5-aza-4-methyl-3-octene-2-onato)dicopper(II)

Kwiatkowski, Edmund; Kwiatkowski, Marek; Olechnowicz, Aleksandra; Mroziński, Jerzy; Ho, Douglas M.; Deutsch, Edward

doi:10.1016/s0020-1693(00)84012-8

Cited by 39 publications

(7 citation statements)

References 12 publications

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“…A large number of publications describing the preparation of the half-units of these unsymmetrical ligands, using various derivatives of salicylaldehyde, have been reported [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Various tridentate and tetradentate Schiff bases and relative metal complexes were obtained.…”

Section: Introductionmentioning

confidence: 99%

Unsymmetrical Tetradentate Schiff Base Complexes Derived from 2,3-diaminophenol and Salicylaldehyde or 5-bromosalicylaldehyde

Ourari¹,

Ouari²,

Moumeni³

et al. 2006

Transition Met Chem

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Salicylaldehyde or 5-bromosalicylaldehyde reacted with 2,3-diaminophenol in absolute EtOH in a 2:1 molar ratio to give new unsymmetrical Schiff bases (H 2 L). The bases were used as ligands to coordinate Mn(III), Ni(II) and Cu(II) chlorides leading to [Mn III ClL] AE EtOH and [M II L] or [M II L] AE 2H 2 O (M=Ni or Cu) complexes. Their structures were determined using mass spectroscopy, IR, u.v.-vis and 1 H-n.m.r. The cyclic voltammetry in acetonitrile showed irreversible waves for both ligands. Under the same experimental conditions, the complexes exhibited mainly the non-reversible reduction of the Ni(II) or Cu(II) ion to Ni(0) or Cu(0), while the reduction of Mn(III) to Mn(II) was found to be a quite reversible phenomenon.

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Section: Introductionmentioning

confidence: 99%

Unsymmetrical Tetradentate Schiff Base Complexes Derived from 2,3-diaminophenol and Salicylaldehyde or 5-bromosalicylaldehyde

Ourari¹,

Ouari²,

Moumeni³

et al. 2006

Transition Met Chem

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“…These results do not fit the trend of the Hatfield's analysis. Compounds 2 and 3 with relatively simple structures are not unique in this respect (Table , compounds 15–24), emphasizing the need to take into consideration other structural factors to improve theoretical models.…”

Section: Discussionmentioning

confidence: 99%

“…Magneto‐structural correlations for copper(II) monochloro‐bridged chain compounds have not been developed in the same detail as those for the dichloro‐bridged dimers because of the insufficient amount of both structurally and magnetically characterized examples ,. [28c] The relevance of various geometrical aspects in the magnetic behavior of mono‐µ‐chloro–copper chains has been considered. Hatfield[32a] pointed out that overall ferromagnetic behavior can be expected for values of the φ/R 0 ratio lower than approximately 40 and higher than 57, whereas antiferromagnetic character appears when this ratio is between these two values.…”

Section: Discussionmentioning

confidence: 99%

“…While the majority of the compounds with copper–chloride bridges usually show small ferromagnetic or antiferromagnetic coupling constants (Table ),, , , , copper–carboxylato bridges provide a pathway for much stronger magnetic superexchange. Cu II is known to form molecular tetracarboxylate clusters, which contain the characteristic paddlewheel dimer.…”

Section: Discussionmentioning

confidence: 99%

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Synthesis, Characterization, and Magnetic Properties of a Series of Copper(II) Chloride Complexes of Pyridyliminebenzoic Acids

et al. 2018

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A series of Cu II halide complexes, Cu(HL1)Cl 2 ·CH 3 OH (1), [Cu(L1)Cl] 2 ·H 2 O (2), [Cu(HL2)Cl 2 ] 2 ·2DMF (3), [Cu(HL2) 2 Cl] n Cl n · 2nH 2 O (4), and [Cu(L3)Cl] n (5), containing pyridyliminebenzoic acids HL1, HL2, and HL3 derived from o-, m-, and p-aminobenzoic acids, respectively, have been obtained as single crystals and characterized by elemental analysis, IR, EPR spectroscopy, magnetic measurements, and single-crystal X-ray diffraction techniques. The results obtained show the formation of molecular (1), dimeric (2, 3), and polymeric structures (4, 5) based on chloride (1-4) and carboxylate bridges (5) with copper(II) ions in the square pyramidal geometry of varying degrees of distortion. In the case of 2 and 5 the ligand deprotonation was completely achieved even in the absence of a base. The closest Cu···Cu separations are found in the crystal lattices of the polymer 5 (3.33 Å) and dimers 2 (3.35 Å) and 3 (3.38 Å).[a]We have been exploring the chemistry of the Schiff base ligands that originate from the condensation of 2-PCA and aminobenzoic acids towards 3d metals (Cr, Mn, Co, Ni, Zn) with the aim of producing new complexes with diverse potential advantages. [9] We have now extended our investigations to copper and describe herein the formation and crystal structures of five new copper(II) complexes, Cu(HL1)Cl 2 ·CH 3 OH (1), [Cu(L1)Cl] 2 ·H 2 O (2), [Cu(HL2)Cl 2 ] 2 ·2DMF (3), [Cu(HL2) 2 Cl] n Cl n · 2nH 2 O (4), and [Cu(L3)Cl] n (5), containing pyridyliminebenzoic acids HL1, HL2, and HL3 derived from o-, m-and p-aminobenzoic acids, respectively (Scheme 1, DMF = N,N-dimethylformamide). The position of the carboxylate group in the structural isomers HL1-HL3 influences the amount of chloride ligands in the coordination environments around the copper atoms in 1-5 what imposes the particular bridging pattern between the metal centers. Magnetic susceptibility measurements revealed antiferromagnetic (1-3, 5) and ferromagnetic coupling (4) between the Cu atoms. The data obtained were compared to the exchange parameters of other Cu II dimers and polymers with chloro bridges to assess their consistency with known magnetostructural J-correlations. Moreover, theoretical methods were employed to provide a detailed analysis of the electronic structures of the complexes and independent evaluation of the magnetic coupling constants. Scheme 1. Formation of Schiff base ligands HL1, HL2, and HL3 and respective copper(II) complexes 1-5. Figure 5. Fragment of the crystal structure of 5 with principal labeling and displacement ellipsoids for non-H atoms drawn at the 50 % probability level (left). One-dimensional double-stranded polymer formed by Cu-O coordination bonding in complex 5 projected oblique to the b axis (right).

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“…Such unequal copper-chlorido distances are common in chlorido-bridged copper dimers [40][41][42][43][44]. The CuÁ Á ÁCu 0 distance is 3.4258(6) Å (3.5887(5) Å for other dimer) and this long distance is unlikely to allow direct spin-spin coupling to occur as it is much greater than the interatomic distance of 2.556 Å in metallic copper at 20°C [45].…”

Section: Structures Of [Cu(en)cl 2 ] 2 and [Cu(edda)]mentioning

confidence: 99%

Structural characterization, ROS-inductive and proteasome inhibitory properties of ternary and binary copper(II) complexes of N2- and N2O2-ligands

Chan

Lai

Ooi

et al. 2016

Inorganica Chimica Acta

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Synthesis, structure and magnetic properties of a new chloro-bridged dimeric copper complex, bis(μ-chloro)bis(8-amino-5-aza-4-methyl-3-octene-2-onato)dicopper(II)

Cited by 39 publications

References 12 publications

Unsymmetrical Tetradentate Schiff Base Complexes Derived from 2,3-diaminophenol and Salicylaldehyde or 5-bromosalicylaldehyde

Unsymmetrical Tetradentate Schiff Base Complexes Derived from 2,3-diaminophenol and Salicylaldehyde or 5-bromosalicylaldehyde

Synthesis, Characterization, and Magnetic Properties of a Series of Copper(II) Chloride Complexes of Pyridyliminebenzoic Acids

Structural characterization, ROS-inductive and proteasome inhibitory properties of ternary and binary copper(II) complexes of N2- and N2O2-ligands

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