title: Switchable platinum-based tweezers with Pt-Pt bonding and selective luminescence quenching.
abstract: Molecular tweezers incorporating peripheral platinum salphen complexes and a central chelating terpyridine group have been synthesized. The terpyridine can be switched upon metal binding between a free 'W' shaped form and a coordinated 'U' form. The crystallographic structure of the zinc-closed molecular tweezers was obtained and presented a strong π-stacking between the Pt-salphen units associated with a Pt-Pt bond. The luminescence properties, notably in response to selected guest ions (Zn(2+), Pb(2+), Hg(2+)) and the resulting mechanical motion, have been investigated by UV-Vis and emission spectroscopy. While ion coordination to the terpy resulted in no significant changes in the luminescence, a selective intercalation of a second Hg(2+) associated with a large differential quenching was observed.
authors.affiliation: Sorbonne Universités, UPMC Univ Paris 06, UMR 8232, Institut Parisien de Chimie Moléculaire, 4 place Jussieu, 75005, Paris, France. bernold.hasenknopf@upmc.fr guillaume.vives@upmc.fr.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Doistau
authors.forename: Caroline
authors.initials: C
authors.lastname: Rossi-Gendron
authors.forename: Arnaud
authors.initials: A
authors.lastname: Tron
authors.forename: Nathan D
authors.initials: ND
authors.lastname: McClenaghan
authors.forename: Lise-Marie
authors.initials: LM
authors.lastname: Chamoreau
authors.forename: Bernold
authors.initials: B
authors.lastname: Hasenknopf
authors.forename: Guillaume
authors.initials: G
authors.lastname: Vives