title: Copper(I/II) complexes of a bis(tetrathiafulvalene)-2,2'-bipyridine: synthesis, characterization, magnetic and electrochemical properties.
abstract: The coordination ability of the electroactive TTF-based chelating ligand 5,5'-bis(4,5-bis(thiomethyl)-4'-carbamoyltetrathiafulvalene)-2,2'-bipyridine (L) has been tested with Cu(I) and Cu(II) centres. [(L)2Cu(I)](PF6), [(L)2Cu(II)](OTf)2 and [(L)Cu(II)(DMF)3](OTf)2 have been synthesized. A single-crystal X-ray analysis was performed on [(L)Cu(II)(DMF)3](OTf)2, showing a distorted octahedral geometry around the Cu(II) centre, and the formation of dimeric units in the solid state through weak coordination in apical position of an amide oxygen atom from a neighbouring complex. Magnetic data show that the paramagnetic metallic centres are isolated, in agreement with the solid-state structure. Electrochemical measurements were performed on the three complexes and in all cases the Cu(I)/Cu(II) and TTF/TTF+*/TTF2+ redox processes were observed.
authors.affiliation: Laboratoire Chimie, Ingénierie Moléculaire et Matériaux d'Angers, UMR 6200 CNRS-Université d'Angers, Bât. K, 2 Boulevard Lavoisier, 49045, Angers, France.
authors.forename: Thomas
authors.initials: T
authors.lastname: Devic
authors.forename: David
authors.initials: D
authors.lastname: Rondeau
authors.forename: Yücel
authors.initials: Y
authors.lastname: Sahin
authors.forename: Eric
authors.initials: E
authors.lastname: Levillain
authors.forename: Rodolphe
authors.initials: R
authors.lastname: Clérac
authors.forename: Patrick
authors.initials: P
authors.lastname: Batail
authors.forename: Narcis
authors.initials: N
authors.lastname: Avarvari