Oxidative nitrogen ⋯ nitrogen coupling of nitriles at a dicopper site and the structure of a pentanuclear copper–triazolyl complex containing two-co-ordinate and three-co-ordinate copper(I)

Abstract

Reaction of a di-copper(i1) complex of a macrocyclic ligand with acetonitrile in the presence of O2 and H20 affords a pentanuclear complex containing two-co-ordinate and three-co-ordinate copper(1) atoms linked via triply bridging 3,5-dimethyl-I ,2,4-triazolate groups.

Bis(acetonitrile-κN)diaquabis(perchlorato-κO)copper(II)

“…For details of the changing Cu(II/I) redox potential with increasing acetonitrile contents in water-acetonitrile solution, see: Cox et al (1988); Verma & Sood (1979); Sumalekshmy & Gopidas (2005); Ajayakumar et al (2009); Drew et al (1985). For the dependence of the luminescent properties (emission energy) of the 3-cyano-4-dicyanomethylene-5-oxo-4,5dihydro-1H-pyrrol-2-olate (A)-based salts depend on the molecular environment around (A), see: Tafeenko et al (2009Tafeenko et al ( , 2010.…”

“…-acetonitrile-water mixture causes reduction of copper(II) to copper(I), as it was documented that i) copper(II) salt solution in acetonitrile-water mixture is a powerful oxidizer of organic molecules (Verma et al, 1979;Cox et al,1988;Sumalekshmy et al, 2005;Ajayakumar et al, 2009); ii) acetonitrile can reduce Cu 2+ to Cu + (Drew et al, 1985).…”

Bis(3,5-dimethyl-1,2,4-triazolato-κN4)bis(pivalic acid-κO)copper(II) dihydrate

“…Indeed, many structures of coordination complexes have been reported, showing a variety of coordination modes (Haasnoot, 2000). Rare examples of structures containing the bridging 3,5-dimethyl-1,2,4-triazole ligand include N 1 ,N 2 bridging (Yi et al, 2004) and N 1 ,N 2 ,N 4 bridging (Drew et al, 1985;Zhang et al, 2004). Here, we report the title copper(II) complex, (I), with the 3,5-dimethyl-1,2,4-triazole ligand exhibiting a monodentate N 4 coordination mode.…”

Tetraimine Schiff base macrocycles derived from heterocyclic dicarbonyls

“…0.80 R appear not to generate macrocyclic complexes with L . Furthermore neither Cu(II) nor Ni(II) act as templates for this group of 'This lecture is presented in memoriam Martin Nelson (1928Nelson ( -1985 Pb cation as template a [20] ± [18] ring contraction occurred to give the Pb complex of the oxazolidone-containing macrocycle (8) N atoms and bridged by the anion, (Fig. 2).…”