Structural diversity and magnetic properties of copper(<scp>ii</scp>) quinaldinate compounds with amino alcohols

Podjed, Nina; Modec, Barbara; Clérac, Rodolphe; Rouzières, Mathieu; Alcaide, María; López‐Serrano, Joaquín

doi:10.1039/d2nj00296e

Cited by 8 publications

(5 citation statements)

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“…Upon cooling, the μ eff continuously decreases and reaches a minimum value of 0.33 μ B at 20 K for 1 and 0.34 μ B at 9 K for 4 , suggesting the predominant antiferromagnetic interaction between Cu( ii ) centers within the dimer unit coupled through the pyrazole nitrogen atoms. 52,53 Upon further cooling, a small increase of μ eff with maximum values of 0.43 μ B for 1 and 0.38 μ B for 4 at 4 K were observed and the values of μ eff drop down to 0.37 μ B for 1 and 0.32 μ B for 4 at 2 K. These behaviors suggest the presence of weak ferromagnetism at low temperature, arising from the occurrence of a canting between antiferromagnetic coupled spins. 54,55 It is well-known that spin-canting can arise from the single-ion magnetic anisotropy and antisymmetric exchange (Dzyaloshinsky–Moriya interaction).…”

Section: Resultsmentioning

confidence: 93%

Synthesis, X-ray structures, and magnetic properties of seven polynuclear Cu(ii) complexes containing pyrazole-3,5-dicarboxylate with various ancillary ligands

et al. 2023

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Section: Resultsmentioning

confidence: 93%

Synthesis, X-ray structures, and magnetic properties of seven polynuclear Cu(ii) complexes containing pyrazole-3,5-dicarboxylate with various ancillary ligands

et al. 2023

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“…Under such scheme, the poor overlap between the magnetic orbitals of adjacent Cu(II) ions of the dimers that governs the antiferromagnetic component of the exchange interaction is expected to result in dominant ferromagnetic coupling [ 110 ]. Previous compounds containing such Cu‒O‒C‒O‒Cu bridges have shown weak ferromagnetic behavior [ 111 – 113 ].…”

Section: Resultsmentioning

confidence: 99%

Effects of the tetravanadate [V4O12]4− anion on the structural, magnetic, and biological properties of copper/phenanthroline complexes

Sánchez-Lara,

Favela,

Tzian

et al. 2024

J Biol Inorg Chem

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The aim to access linked tetravanadate [V4O12]4− anion with mixed copper(II) complexes, using α-amino acids and phenanthroline-derived ligands, resulted in the formation of four copper(II) complexes [Cu(dmb)(Gly)(OH2)]2[Cu(dmb)(Gly)]2[V4O12]·9H2O (1) [Cu(dmb)(Lys)]2[V4O12]·8H2O (2), [Cu(dmp)2][V4O12]·C2H5OH·11H2O (3), and [Cu(dmp)(Gly)Cl]·2H2O (4), where dmb = 4,4′-dimethioxy-2,2′-bipyridine; Gly = glycine; Lys = lysine; and dmp = 2,9-dimethyl-1,10-phenanthroline. The [V4O12]4− anion is functionalized with mixed copper(II) units in 1 and 2; while in 3, it acts as a counterion of two [Cu(dmp)]2+ units. Compound 4 crystallized as a unit that did not incorporate the vanadium cluster. All compounds present magnetic couplings arising from Cu⋯O/Cu⋯Cu bridges. Stability studies of water-soluble 3 and 4 by UV–Vis spectroscopy in cell culture medium confirmed the robustness of 3, while 4 appears to undergo ligand scrambling over time, resulting partially in the stable species [Cu(dmp)2]+ that was also identified by electrospray ionization mass spectrometry at m/z = 479. The in vitro cytotoxicity activity of 3 and 4 was determined in six cancer cell lines; the healthy cell line COS-7 was also included for comparative purposes. MCF-7 cells were more sensitive to compound 3 with an IC50 value of 12 ± 1.2 nmol. The tested compounds did not show lipid peroxidation in the TBARS assay, ruling out a mechanism of action via reactive oxygen species formation. Both compounds inhibited cell migration at 5 µM in wound-healing assays using MCF-7, PC-3, and SKLU-1 cell lines, opening a new window to study the anti-metastatic effect of mixed vanadium–copper(II) systems. Graphical abstract

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“…A search for Cu coordinated by 2-aminopropan-1-ol gave seven hits. In all but one case (CSD refcode BOYPIO;Nieuwpoort et al, 1983;Marsh, 2005), the base coordinates with the OH proton intact, as in Podjed et al (2022).…”

Section: Database Surveymentioning

confidence: 99%

Crystal structures, electron spin resonance, and thermogravimetric analysis of three mixed-valence copper cyanide polymers

Corfield,

Elsayed,

DaCunha

et al. 2024

Acta Crystallogr C

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The crystal structures of three mixed-valence copper cyanide alkanolamine polymers are presented, together with thermogravimetric analysis (TGA) and electron spin resonance (ESR) data. In all three structures, a CuII moiety on a crystallographic center of symmetry is coordinated by two alkanolamines and links two CuICN chains via cyanide bridging groups to form diperiodic sheets. The sheets are linked together by cuprophilic CuI–CuI interactions to form a three-dimensional network. In poly[bis(μ-3-aminopropanolato)tetra-μ-cyanido-dicopper(I)dicopper(II)], [Cu4(CN)4(C3H8NO)2] n , 1, propanolamine bases have lost their hydroxyl H atoms and coordinate as chelates to two CuII atoms to form a dimeric CuII moiety bridged by the O atoms of the bases with CuII atoms in square-planar coordination. The ESR spectrum is very broad, indicating exchange between the two CuII centers. In poly[bis(2-aminopropanol)tetra-μ-cyanido-dicopper(I)copper(II)], [Cu3(CN)4(C3H9NO)2] n , 2, and poly[bis(2-aminoethanol)tetra-μ-cyanido-dicopper(I)copper(II)], [Cu3(CN)4(CH7NO)2] n , 3, a single CuII atom links the CuICN chains together via CN bridges. The chelating alkanolamines are not ionized, and the OH groups form rather long bonds in the axial positions of the octahedrally coordinated CuII atoms. The coordination geometries of CuII in 2 and 3 are almost identical, except that the Cu—O distances are longer in 2 than in 3, which may explain their somewhat different ESR spectra. Thermal decomposition in 2 and 3, but not in 1, begins with the loss of HCN(g), and this can be correlated with the presence of OH protons on the ligands in 2 and 3, which are not present in 1.

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

Abstract: Reactions between [Cu(quin)2(H2O)] (quin– = the anionic form of quinoline-2-carboxylic acid) and a series of aliphatic amino alcohols have yielded structurally very diverse copper(II) complexes, labelled a–g. The single-crystal X-ray...

Cited by 8 publications

References 94 publications

Synthesis, X-ray structures, and magnetic properties of seven polynuclear Cu(ii) complexes containing pyrazole-3,5-dicarboxylate with various ancillary ligands

Synthesis, X-ray structures, and magnetic properties of seven polynuclear Cu(ii) complexes containing pyrazole-3,5-dicarboxylate with various ancillary ligands

Effects of the tetravanadate [V4O12]4− anion on the structural, magnetic, and biological properties of copper/phenanthroline complexes

Crystal structures, electron spin resonance, and thermogravimetric analysis of three mixed-valence copper cyanide polymers

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