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

ChemistryOpen

Dr. Margaret Ching-Lam Yeung¹  Dr. Ben Wai-Kin Chu¹ 

[1] Institute of Molecular Functional Materials (Areas of Excellence Scheme, University Grants Committee) and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong (P. R. China)

关键词: host–guest systems;    luminescence;    molecular recognition;    platinum;    sensors;   

DOI  :  10.1002/open.201402019

来源: Wiley

【 摘 要 】

Abstract

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.

【 授权许可】

CC BY-NC-ND   
© 2014 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.

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