DOISTAU, Benjamin; TRON, Arnaud; DENISOV, Sergey A.; JONUSAUSKAS, Gediminas; MCCLENAGHAN, Nathan D.; GONTARD, Geoffrey; MARVAUD, Valérie; HASENKNOPF, Bernold; VIVES, Guillaume

doi:10.1002/chem.201404064

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DOISTAU, Benjamin
Institut Parisien de Chimie Moléculaire [IPCM]

TRON, Arnaud
Institut des Sciences Moléculaires [ISM]

DENISOV, Sergey A.
Institut des Sciences Moléculaires [ISM]
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Article de revue

Ce document a été publié dans

Chemistry - A European Journal. 2014, vol. 20, n° 48, p. 15799-15807

Wiley-VCH Verlag

Résumé en anglais

The design and synthesis of switchable molecular tweezers based on a luminescent terpy(Pt-salphen)2 (1; terpy=terpyridine) complex is reported. Upon metal coordination, the tweezers can switch from an open “W”-shaped conformation to a closed “U”-shaped form that is adapted for selective recognition of cations. Closing of the tweezers by metal coordination (M=Zn2+, Cu2+, Pb2+, Fe2+, Hg2+) was monitored by 1H NMR and/or UV/Vis titrations. During the titration, exclusive formation of the 1:1 complex [M(1)] was observed, without appearance of an intermediate 1:2 complex [M(1)2]. The crystallographic structure of the 1:1 complex was obtained with Pb2+ and showed a distorted helical structure. Selective intercalation of Hg2+ cations by the closed “U” form was observed. The tweezers were reopened by selective metal decoordination of the terpyridine ligand by using tris(2-aminoethyl)amine (tren) as a competitive ligand without modification of the Pt–salphen complex. Detailed photophysical studies were performed on the open and closed tweezers. Structured emission was observed in the open form from the Pt–salphen moieties, with a high quantum yield and a long lifetime. The emission is slightly modified upon closing with 1 equivalent of Zn2+ or Hg2+, whereas a dramatic quenching was obtained upon intercalation of additional Hg2+.< Réduire

Mots clés en anglais

molecular tweezers

Platinum

salphen

Phosphorescence

Cooperativity

DOI

http://dx.doi.org/10.1002/chem.201404064

Project ANR

Initiative d'excellence de l'Université de Bordeaux - ANR-10-IDEX-0003

Origine

Importé de hal

Unités de recherche

Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798