title: Synthesis and Photophysical Studies of Calixarene-Based Alkynylplatinum(II) Terpyridine Complexes with Various Receptor Sites for Colorimetric and Luminescence Sensing of Anions.
abstract: A series of mononuclear and dinuclear platinum(II) terpyridine complexes with amide-, sulfonamide-, and urea-containing ligands (1-9) has been successfully designed and synthesized, and their photophysical and anion-binding properties have been studied. The anion-binding properties of the complexes were studied by electronic absorption, emission, and (1)H NMR spectroscopy. Upon the binding with anions, the dinuclear complexes 1-3 exhibit large electronic absorption and emission spectral changes, while for the mononuclear analogues 4-6 much smaller spectral changes were observed. Interesting colorimetric responses towards different anions were observed in dinuclear complexes 1-3. Dinuclear complexes 7-9 are found to be insensitive to anion-binding, which could be attributed to the presence of intramolecular Pt⋅⋅⋅Pt interactions and/or π-π stacking in the complexes that led to the reduced anion-binding affinity.
authors.affiliation: Institute of Molecular Functional Materials (Areas of Excellence Scheme, University Grants Committee, Hong Kong) and, Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China), Fax.
authors.forename: Franky Ka-Wah
authors.initials: FK
authors.lastname: Hau
authors.affiliation: Institute of Molecular Functional Materials (Areas of Excellence Scheme, University Grants Committee, Hong Kong) and, Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China), Fax.
authors.forename: Hiu-Suet
authors.initials: HS
authors.lastname: Lo
authors.affiliation: Institute of Molecular Functional Materials (Areas of Excellence Scheme, University Grants Committee, Hong Kong) and, Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China), Fax. wwyam@hku.hk.
authors.forename: Vivian Wing-Wah
authors.initials: VW
authors.lastname: Yam
keywords: host-guest systems; luminescence; molecular recognition; platinum; sensors