title: Design and synthesis of calixarene-based bis-alkynyl-bridged dinuclear Au(I) isonitrile complexes as luminescent ion probes by the modulation of Au..Au interactions.
abstract: Two calixarene-based bis-alkynyl-bridged Au(I) isonitrile complexes with two different crown ether pendants, [{calix[4]arene-(OCH(2)CONH-C(6)H(4)C[triple bond]C)(2)}{Au(CNR)}(2)] (R=benzo[15]crown-5 (1); R=benzo[18]crown-6 (2)), together with their related crown-free analogue 3 (R=C(6)H(3)(OMe)(2)-3,4) and a mononuclear gold(I) complex 4 with benzo[15]crown-5 pendant, have been designed and synthesized, and their photophysical properties have been studied. The X-ray structure of the ligand, calix[4]arene-(OCH(2)CONH-C(6)H(4)C[triple bond]CH)(2) has been determined. The cation-binding properties of these complexes with various metal ions have been studied using UV/Vis, emission, (1)H NMR, and ESI-MS techniques, and DFT calculations. A new low-energy emission band associated with AuAu interaction could be switched on upon formation of the metal ion-bound adduct in a sandwich fashion.
authors.affiliation: Centre for Carbon-Rich Molecular and Nano-Scale Metal-Based Materials Research, Department of Chemistry and HKU-CAS Joint Laboratory on New Materials, The University of Hong Kong, Pokfulam Road, Hong Kong, China.
authors.forename: Xiaoming
authors.initials: X
authors.lastname: He
authors.forename: Wai Han
authors.initials: WH
authors.lastname: Lam
authors.forename: Nianyong
authors.initials: N
authors.lastname: Zhu
authors.forename: Vivian Wing-Wah
authors.initials: VW
authors.lastname: Yam