Novel anion-tunable structural diversity and new topologies in CuII complexes of a Schiff base

Solvent-induced structural transformation from heptanuclear to decanuclear [Co–Ln] coordination clusters: trapping of unique counteranion and understanding of aggregation pathways

The MeCN solvent-induced transformations of heptanuclear LnIII3CoII2CoIII2⁺ cationic aggregates, associated with literature unknown Ln(iii)-pivalate-based counter anions, to decanuclear LnIII3CoII3/2CoIII4/5 clusters have been investigated.

Anion-dependent self-assembly of copper coordination polymers based on pyrazole-3,5-dicarboxylate and 1,2-di(4-pyridyl)ethylene

By utilizing a pyrazole-3,5-dicarboxylic acid (H₃pzdc) and flexible 1,2-di(4-pyridyl)ethylene (dpe) with various copper(ii) salts under the same solvothermal synthetic conditions, six novel coordination polymers, namely, {[Cu₂(pzdc)(dpe)₂]X}_n (X = NO₃^- (1), ClO₄^- (2), BF₄^- (3), SCN^- (4)), {[Cu(ii)₄Cu(i)₄(pzdc)₄(dpe)₆](H₂O)₄}_2n (5), and {[Cu₅(HPO₄)₂ (pzdc)₂(dpe)₃](H₂O)₅}_n (6) were obtained. The structural diversity of compounds 1-6 depends on the starting Cu(ii) salts. Compounds 1-4 are isostructural and exhibit a 3D porous cationic pillar-layered coordination framework with lattice monoanions incorporated into the channels of the framework. When using copper(ii) sulfate as a reagent, a neutral mixed-valence Cu(i,ii) 2D + 2D → 2D parallel interpenetrated layer of 5 was obtained. In the case of a phosphate trianion, compound 6 shows a 3D coordination framework which contains μ₄-HPO₄^2- linking between Cu(ii) centers. The anion-exchange properties of 1-4 were studied. Interestingly, compounds 1-4 exhibit the irreversible chemisorption of the thiocyanate anion instead of anion exchange without the destruction of their structural framework as confirmed by PXRD, IR, UV-Vis, and AA spectroscopy. Moreover, the anion-induced structural transformation of 1-4 was observed when exchanging with an azide anion. The luminescent properties of 1-6 and exchanged products were also investigated.

A family of [Cu2], [Cu4] and [Cu5] aggregates: alteration of reaction conditions, ancillary bridges and capping anions

Enforced coordination by NO₃⁻, ClO₄⁻ and CF₃COO⁻ groups resulted in the formation of [Cu₂] (1), [Cu₄] (2) and [Cu₅] (3) complexes using H₅L1.

Strategic synthesis of [Cu2], [Cu4] and [Cu5] complexes: inhibition and triggering of ligand arm hydrolysis and self-aggregation by chosen ancillary bridges

A new family of Cu^II-based coordination aggregates is synthesized from HL1 with Cu(ClO₄)₂·6H₂O in the absence and presence of a group of carboxylates.

Unique trapping of paddlewheel copper(ii) carboxylate by ligand-bound {Cu2} fragments for [Cu6] assembly

Trapping of paddlewheel {Cu₂(carboxylate)₄} by ligand-bound {Cu₂(μ-H₂L)}³⁺ units resulted in dumbbell-shaped [Cu₆] complexes modulating the tetracarboxylate bridged Cu⋯Cu separations.

Efficient preparation of multimetallic ONO-based Schiff base complexes of nickel(ii) and copper(ii)

Spectroscopy, structures, electrochemical behavior and magnetic properties of a series of readily prepared [(R-ONO)M(μ-4,4′-bipy)M(R-ONO)] complexes (R = anisyl or ferrocenyl; M = Ni, Cu) have been explored.

Mono- and tetra-nuclear copper complexes bearing bis(imino)phenoxide derived ligands: catalytic evaluation for benzene oxidation and ROP of ε-caprolactone

Mono- and tetra-nuclear copper bis(imino)phenoxide complexes have been evaluated as catalysts for benzene oxidation and ROP of ε-caprolactone.