Platinum(II)‐directed Self‐assembly Loop Complexes for Anion Recognition and Sensing. Issue 1 (7th December 2017)

• Record Type: Journal Article
• Authors: Chang, Kai‐Chi; Chen, Chan‐Yu; Lin, Tzu‐Pin; Ku, Po‐Jen; Chen, Chun‐Lin; Wang, Chih‐Ming; Lin, Hsiu‐Mei; Tseng, Mei‐Chun; Singh, Ashutosh S.; Sun, Shih‐Sheng
• Is Part Of: Journal of the Chinese Chemical Society. Volume 65:Issue 1(2018)
• Page Start: 141
• Page End: 148
• Publication Date: 2017-12-07
• Subjects: Self‐assembly -- Anion recognition -- Platinum(II) complexes; Chemistry -- Periodicals; Electronic journals; 540.5
• DOI: 10.1002/jccs.201700275
• Languages: English
• ISSNs: 0009-4536

Abstract

Abstract : Two structurally simple Pt(II)‐directed self‐assembly loop complexes were prepared by reactions of cis ‐(PEt3 )2 Pt(OTf)2 and the corresponding pyridylamide‐functionalized pyridyl ligands. Both Pt(II)‐based complexes exhibit singlet fluorescence, indicating that the platinum metal serves only as a structural, rather than a direct photophysical role within the loop framework. The crystal structure of complex1 shows a distorted loop conformation with a hydrophobic pocket defined by the bridging ligands. The anion binding affinities of these two complexes were investigated with a range of anions. Such studies using UV–vis absorption, fluorescence, and 1 H NMR titrations showed that complex1 exhibits excellent binding sensitivity and selectivity for benzoate over acetate in solution via a combination of electrostatic, hydrogen‐bonding, and π–π interactions, whereas complex2 shows comparable binding affinities toward acetate and benzoate due to the lack of favorable aromatic π–π interaction. Abstract : Two Pt(II)‐directed self‐assembly loop complexes bridged by bis‐pyridyl pyridine‐2, 6‐dicarboxamide ligands have been prepared. The smaller loop complex1 displayed superior selectivity for benzoate over acetate in solution due to a combination of electrostatic, hydrogen‐bonding, and π–π interactions, whereas the larger loop complex2 showed comparable binding affinities toward acetate and benzoate due to the lack of favorable aromatic π–π interaction.