Synthesis, characterization and X-ray structures of the new dinucleating ligand 2,8-dimethyl-1,4,5,6,7,10,11,12-octahydroimidazo[4,5-h] imidazo[4,5-c][1,6]diazecine-5,11-diethanoic acid and its Cu(II) complex; an alternating chain of Cu(II) ions, coupled both intramolecularly and intermolecularly

A dicopper complex with distant metal centers. Structure, magnetic properties, electrochemistry and catecholase activity

“…Identical spectra were obtained whether the solution was prepared dissolving a sample of the isolated solid [Cu 2 dimeim(H 2 O) 4 ](ClO 4 ) 4 , or from equivalent amounts of Cu(ClO 4 ) 2 and dimeim. Similar spectra have been previously assigned to a weak exchange interaction between copper(II) centers in dinuclear complexes with Cu-Cu separations of 7.3-8Å 0 [8,[38][39][40], in which as in the present case, no DMs = ±2 has been observed at half field. This spectrum was successfully simulated using the WINEPR from Brucker Co.…”

“…The magnetic data were fitted in the temperature range 4-300 K leading to the following parameters: J = À7.11 cm À1 , q = 0.003 and TIP = 0.001 emu mol À1 . A similar compound was described by Mendoza-Diaz et al [38], for which a value of J = À6.87 cm À1 was obtained when the data were fit with this same model.…”

Solvent and pH effects on the redox behavior and catecholase activity of a dicopper complex with distant metal centers

“…1. It is relevant to mention that at least twelve other crystal structures of dicopper complexes with diazecine ligands have been described in the literature [5,13,[21][22][23][24][25], one of them (in Ref. [13]) with this same ligand and a different anion, and in each and every one of them copper ions exhibit a square pyramidal coordination geometry.…”

Electrochemical studies of a dinuclear copper complex with imidazole derivative ligand H3bphenim

“…12(a). This plot is compared with that obtained for another of the complexes in the ongoing study, Cu 2 glymeim 2+ [34] (Fig. 12(b)), the structure of which includes two copper sites analogous to Cu II B .…”

“…With this intention, we have recently prepared a series of dinuclear copper complexes with imidazole derivative ligands [17,34]. This particular paper describes the complete electrochemical study of one of these complexes, Cu 2 bphenim + .…”