Ben Wai-Kin Chu

Anion Binding Properties of Alkynylplatinum(II) Complexes with Amide-Functionalized Terpyridine: Host–Guest Interactions and Fluoride Ion-Induced Deprotonation

Molecular sensors able to detect ions are of interest due to their potential application in areas such as pollutant sequestration. Alkynylplatinum(II) terpyridine complexes with an amide-based receptor moiety have been synthesized and characterized. Their anion binding properties based on host–guest interactions have been examined with the use of UV-vis absorption and emission spectral titration studies. Spectral changes were observed for both complexes upon the addition of spherical and nonspherical anions. Their titration profiles were shown to be in good agreement with theoretical results predicting a 1:1 binding model, and the binding constants were determined from the experimental data. Drastic color changes from yellow to orange–red were observed for one of the complexes upon titration with fluoride (F−) ion in acetone. These changes were ascribed to the deprotonation of the amide functionalities induced by F− ion, and this was confirmed by the restoration of spectral changes upon addition of trifluoroacetic acid to the F− ion–complex mixture as well as by electrospray ionization mass spectrometry (ESI-MS) data.

Synthesis, structure, luminescence and electrochemical studies of a novel class of ruthenium(II) polypyridine complexes with orthometallated aminocarbene ligands

A series of ruthenium(II) orthometallated aminocarbene complexes have been synthesized and characterized. Their electrochemistry, electronic absorption, emission, and the crystal structures of [Ru(phen)2{C(CH2Ph)NHC6H4}]CF3SO3, [Ru(bpy)2{C(CH2Ph)NMeC6H4}]PF6 and [Ru(bpy)2{C(CH2C4H3S)NHC6H4}]CF3SO3 have been studied. The nature of the electronic transitions and the origin of the emission are discussed and an assignment of a 3MLCT emission has been supported by EHMO studies.

Unprecedented luminescence behaviour and structural characterization of a novel class of ruthenium(II) 2,2′-bipyridine complexes with orthometallated aminocarbene ligands

Novel luminescent ruthenium(II) bipyridine complexes with orthometallated aminocarbene ligands have been prepared and their photophysical properties studied.

Syntheses, crystal structures, photophysics and cation-binding studies of luminescent functionalized ruthenium polypyridine complexes with orthometallated aminocarbene ligands

A series of luminescent functionalized ruthenium polypyridine complexes with orthometallated aminocarbene ligands has been synthesized and their photophysical properties studied. The cation-binding properties of one crown-ether functionalized complexes have also been studied. The X-ray crystal structures of [Ru(bpy)2C(CH2–B15C5)NHC6H3Br]OTf and [Ru(5,5′-Me2bpy)2C(CH2Ph)NHC6H3Br]OTf have been determined (bpy = 2,2′-bipyridine; 5,5′-Me2bpy = 5,5′-dimethyl-2,2′-bipyridine; B15C5 = benzo-15-crown-5).

CCDC 213863: Experimental Crystal Structure Determination

Related Article: Vivian Wing-Wah Yam, Chi-Chiu Ko, Ben Wai-Kin Chu, Nianyong Zhu|2003|Dalton Trans.||3914|