Copper(<scp>ii</scp>) cubanes with a {Cu<sub>4</sub>O} core and well defined S = 1 ground state

Escuer, Albert; Mayans, Júlia; Font-Bardı́a, Mercè

doi:10.1039/c5dt03643g

Cited by 6 publications

(1 citation statement)

References 51 publications

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“…This recorded a separation of 3.181(5) Å for O12–Mn1 and O12*–Mn1*. This long separation thus prevented the possibility for further deprotonation from μ 3 -OH groups and resulting in the formation of a {Mn 4 (μ 4 -O)} complex as seen in Cu II -carboxylate chemistry. , Within the {Mn 4 (μ 3 -OH) 2 } butterfly core the Mn3···Mn4 separation is shortest at 2.820 Å compared to known reports for triangular fragments . The other manganese centers are separated from each other by the distances falling in the range from 3.414 to 3.647 Å (Figure S6).…”

Section: Resultsmentioning

confidence: 86%

Dangling and Hydrolyzed Ligand Arms in [Mn₃] and [Mn₆] Coordination Assemblies: Synthesis, Characterization, and Functional Activity

et al. 2017

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Two flexible, branched, and sterically constrained di- and tripodal side arms around a phenol backbone were utilized in ligands HL1 and HL2 to isolate {Mn} and {Mn} coordination aggregates. 2,6-Bis{(1-hydroxy-2-methylpropan-2-ylimino)methyl}-4-methylphenol (HL1) gave trinuclear complex [Mn(μ-HL1)(μ-OCCH)(CHOH)](ClO)·4CHOH (1), whereas 2,6-bis[{1-hydroxy-2-(hydroxymethyl)butan-2-ylimino}methyl]-4-methylphenol (HL2) provided hexanuclear complex [Mn(μ-HL2)(μ-HL3)(μ-OH)(μ-OCCH)](ClO)·2HO (2). Binding of acetates and coordination of {HL1} provided a linear MnMnMn arrangement in 1. A Mn fused diadamantane-type assembly was obtained in 2 from propionate bridges, coordination of {HL2}, and in situ generated {HL3}. The magnetic characterization of 1 and 2 revealed the properties dominated by intramolecular anti-ferromagnetic exchange interactions, and this was confirmed using density functional theory calculations. Complex 1 exhibited field-induced slow magnetic relaxation at 2 K due to the axial anisotropy of Mn centers. Both the complexes show effective solvent-dependent catechol oxidation toward 3,5-di-tert-butylcatechol in air. The catechol oxidation abilities are comparable from two complexes of different nuclearity and structure.

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Section: Resultsmentioning

confidence: 86%

Dangling and Hydrolyzed Ligand Arms in [Mn₃] and [Mn₆] Coordination Assemblies: Synthesis, Characterization, and Functional Activity

et al. 2017

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A Tetranuclear copper(II) Complex with a Pyridine‐2,6‐dicarboxamide Ligand: Structural and Magnetic Properties and In vitro Antiproliferative Activity Against Human Cancer Cells

Mondal,

Saha,

Das

et al. 2024

ChemistrySelect

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A pentadentate diamide ligand, N,N′‐di(pyridine‐2‐yl)pyridine‐2,6‐dicarboxamide (L1H2) and its tetranuclear Cu(II) complex [Cu4(L1)2(μ3‐OH)2(H2O)3(ClO4)](ClO4) ⋅ H2O are reported. X‐ray crystal structure of the complex reveals that it has an open‐book type architecture. Two central copper atoms are connected to each other by two hydroxo bridges. Each of these two hydroxo bridges also connects the two central copper atoms to one of the two terminal copper atoms. Variable temperature susceptibility measurements show that χMT decreases with the temperature, indicating a strong antiferromagnetic behavior. With the help of DFT calculations the magnetic data was analyzed using the spin Hamiltonian H=−2 J1S3 ⋅ S4 −2 J2(S3 ⋅ S1+ S3 ⋅ S2+ S4 ⋅ S1+ S4 ⋅ S2)−2 J3S1 ⋅ S2 (where subscripts 1 and 2 refer to the terminal copper atoms and 3 and 4 refer to the central copper atoms). The best fit was obtained with 2 J1=−322 cm−1, 2 J2=+34.8 cm−1, 2 J3=−8.8 cm−1 and g=2.18, indicating a δ‐type interaction between terminal copper atoms. The complex proves to be an avid binder of ct‐DNA, with apparent binding constant (Kapp) value estimated as 1.536×107 M−1. In vitro experiments indicate that the Cu(II) complex reduced the proliferation of HCT116 cells among other cell lines. This reduction of cell proliferation may be attributed to the enhancement of intracellular ROS, along with modulation and disruption of cell cycle associated proteins. SKC conceptualized the project, arranged funding and involved in overall coordination among collaborators, analyzing the data, and writing the paper. AM was involved in doing the experimental work on synthesis of the compounds, carrying out analytical and spectroscopic measurements, collecting X‐ray crystallographic data and DNA binding experiments. MS, SM and KDS were involved in study of anticancer activities of the complex. SS helped in refining X‐ray structure of the complex. MC did the magnetic measurements and analysis whereas AF did the DFT calculations.

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Structural diversity of copper(II) amino alcoholate complexes

Seppälä

Sillanpää

Lehtonen

2017

Coordination Chemistry Reviews

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Copper(ii) cubanes with a {Cu₄O} core and well defined S = 1 ground state

Cited by 6 publications

References 51 publications

Dangling and Hydrolyzed Ligand Arms in [Mn₃] and [Mn₆] Coordination Assemblies: Synthesis, Characterization, and Functional Activity

Dangling and Hydrolyzed Ligand Arms in [Mn₃] and [Mn₆] Coordination Assemblies: Synthesis, Characterization, and Functional Activity

A Tetranuclear copper(II) Complex with a Pyridine‐2,6‐dicarboxamide Ligand: Structural and Magnetic Properties and In vitro Antiproliferative Activity Against Human Cancer Cells

Structural diversity of copper(II) amino alcoholate complexes

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Copper(ii) cubanes with a {Cu4O} core and well defined S = 1 ground state

Cited by 6 publications

References 51 publications

Dangling and Hydrolyzed Ligand Arms in [Mn3] and [Mn6] Coordination Assemblies: Synthesis, Characterization, and Functional Activity

Dangling and Hydrolyzed Ligand Arms in [Mn3] and [Mn6] Coordination Assemblies: Synthesis, Characterization, and Functional Activity

A Tetranuclear copper(II) Complex with a Pyridine‐2,6‐dicarboxamide Ligand: Structural and Magnetic Properties and In vitro Antiproliferative Activity Against Human Cancer Cells

Structural diversity of copper(II) amino alcoholate complexes

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Copper(ii) cubanes with a {Cu₄O} core and well defined S = 1 ground state

Dangling and Hydrolyzed Ligand Arms in [Mn₃] and [Mn₆] Coordination Assemblies: Synthesis, Characterization, and Functional Activity

Dangling and Hydrolyzed Ligand Arms in [Mn₃] and [Mn₆] Coordination Assemblies: Synthesis, Characterization, and Functional Activity