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- Title
Terpy(Pt-salphen)<sub>2</sub> Switchable Luminescent Molecular Tweezers.
- Authors
Doistau, Benjamin; Tron, Arnaud; Denisov, Sergey A.; Jonusauskas, Gediminas; McClenaghan, Nathan D.; Gontard, Geoffrey; Marvaud, Valérie; Hasenknopf, Bernold; Vives, Guillaume
- Abstract
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+.
- Subjects
HELICAL structure; CATIONS; CRYSTALLOGRAPHY; AMINES; COORDINATION compounds
- Publication
Chemistry - A European Journal, 2014, Vol 20, Issue 48, p15799
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201404064