Abstract
The use of 2-{[2-(2-hydroxybenzylideneamino)phenylimino]methyl}phenol (H2L) in metal transition chemistry has yielded a co-crystal which is composed by one neutral mononuclear, one cationic dinuclear and one perchlorate anion. During the formation of the complex, one of the salicylaldimine groups of one of the molecules of the H2L ligand hydrolyzed to form an asymmetrical ligand with an amino group leading to the molecule (2-((2-aminophenylimino)methyl)phenol (HL'). The complex was formulated as {[Cu(L)].[Cu2(L)(L')]}.(ClO4). The structure of the complex was solved by single crystal X-ray crystallography. In the mononuclear unit, the Cu2+ atom is coordinated by one dideprotonated molecule of the ligand acting in tetradentate fashion. In the dinuclear unit, one the Cu2+ atom is coordinated by one dideprotonated molecule of the ligand acting in tetradentate fashion and the other Cu2+ is coordinated by the monodeprotonated (2-((2-aminophenylimino)methyl)phenol (HL') acting in tridentate fashion. The two Cu2+ are bridged by the two phenoxo oxygen atoms of the dideprotonated molecule of the ligand. The complex crystallizes in the triclinic space group Pī with the following parameters: a = 13.8864 (3) Å, b = 14.2078 (4) Å, c = 14.5007 (4)) Å, α = 64.593 (3), β = 71.353 (2), γ = 71.707 (2)°, V = 2395.80 (13) Å3, Z = 2, R1 = 0.037, wR2 = 0.041. The supramolecular structures are consolidated by multiple hydrogen bonds.
Highlights
Schiff base ligands with multiple coordination sites are the best choices for building multinuclear metal complexes
Much works have been published in recent years to investigate the relationship between structure and physical properties in dinuclear complexes in which the metal centers are bridged by phenoxo oxygen atoms [8-10]
Schiff bases having several salicylaldimine groups are effective in obtaining this type of complexes
Summary
Schiff base ligands with multiple coordination sites are the best choices for building multinuclear metal complexes. Due to the bridging capacity of the phenoxo group, these ligands always show coordination capacity with both transition metal ions and lanthanide ions [17-21]. They can make it possible to obtain mononuclear which can be used as bricks to build other molecular buildings blocks [22-24]. Ligands with salicylaldimine moieties are effective for the construction of hetero-metallic complexes with d-block and f-block elements [2527]. These ligands have made it possible to prepare molecular species containing both s-block and d- or f-block elements [28-30]. Our research group have already used salicylaldimine derivatives to prepare metalloligands and use them to prepare multinuclear complexes [29,30]
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