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• W2136074893 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=Zn(2+), Cu(2+), Pb(2+), Fe(2+), Hg(2+)) was monitored by (1)H 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 Pb(2+) and showed a distorted helical structure. Selective intercalation of Hg(2+) 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 Zn(2+) or Hg(2+), whereas a dramatic quenching was obtained upon intercalation of additional Hg(2+)." @default.
• W2136074893 created "2016-06-24" @default.
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• W2136074893 date "2014-10-06" @default.
• W2136074893 modified "2023-10-18" @default.
• W2136074893 title "Terpy(Pt-salphen)₂Switchable Luminescent Molecular Tweezers" @default.
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• W2136074893 doi "https://doi.org/10.1002/chem.201404064" @default.
• W2136074893 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25286882" @default.
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