Synthesis and crystal structure of (μ4-oxido)hexakis(μ-chlorido)tetrakis(2-(3-pyridyl)ethane-1-ol)tetracopper(II)

Crystal structure of hexa-μ2-chlorido-μ4-oxido-tetrakis(1-vinyl-1H-imidazole-κN)tetracopper(II), C20H24Cu4Cl6N8O

“…The first laboratory synthesis of a copper cluster complex with the Cu4OCl 6 structural motif was achieved by Bertrand et al in 1966 [6]. From that time, many copper clusters of this type were reported [7][8][9][10][11][12], and their structural properties and catalytic performance were investigated [13][14][15][16][17]. Systematic investigation of µ4-oxido cluster formation was reported, helping to understand the formation and stability of the µ4-oxido motif in general [18].…”

A Unique Discrete Tetranuclear Cu′–Cu(N-N)2Cu–Cu′ Copper(II) Complex, Built from a μ3-1,2,4-Triazolato-μ-carboxylato Ligand, as an Effective DNA Cleavage Agent

“…Only one atypical Cu(II) cluster, the complex [Cu(HL4)(H 2 O)] 4 (NO 3 ) 4 (HL4 = 3-(pyridin-2-yl)-5-(pyrazin-2-yl)-1,2,4-triazole), has been described with a tetrahedral arrangement of the coppers. The structural role played by the heterocycle in this case is not relevant, in contrast with what happens with cubane or cubane-stepped compounds built from μ-oxido, μ-alkoxide, or μ-halo ligands …”

“…These complexes can be classified in four groups: (i) tetrahedral , (ii) rectangular , (iii) butterfly , and (iv) the “1 + 2 + 1” type. Only one atypical Cu(II) cluster, the complex [Cu(HL4)(H 2 O)] 4 (NO 3 ) 4 (HL4 = 3-(pyridin-2-yl)-5-(pyrazin-2-yl)-1,2,4-triazole), has been described with a tetrahedral arrangement of the coppers. The structural role played by the heterocycle in this case is not relevant, in contrast with what happens with cubane or cubane-stepped compounds built from μ-oxido, μ-alkoxide, or μ-halo ligands A few rectangular examples, which can be regarded as dimers of N 1, N 2-bridged dinuclear units (Cu 2 ···Cu 2 ), have been reported, being among them the [Cu I 2 Cu II 2 (L5) 4 (pic) 2 ] and the [Cu I 4 (L5) 4 ] (L5 = 3,5-bis-(pyridin-2-yl)-1,2,4-triazole, Hpic = picolinic acid = pyridine-2-carboxylic acid) compounds, , both obtained from hydrothermal synthesis.…”

Coordination chemistry beyond Werner: interplay between hydrogen bonding and coordination

“…Some years ago we found an unprecedented change of the Jahn-Teller axis for 2 identical Cu(II) compounds, induced by the H bonding of lattice water molecules. 78 In our own more recent work we have started to add H-bond donor groups (alcohols) at the backside of the ligand, allowing specific intermolecular interaction, like in [Cu 4 (m-Cl) 6 (m 4 -O)L 4 ], 79 with L = 2-(3-pyridyl)ethane-1-ol. We also reported an intramolecular case, where a fluoride is locked in a cavity, which is stabilized by CH 2 groups that are pointing towards the fluoride, 80 as shown in Fig.…”