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Platinum(II)‐directed Self‐assembly Loop Complexes for Anion Recognition and Sensing
Author(s) -
Chang KaiChi,
Chen ChanYu,
Lin TzuPin,
Ku PoJen,
Chen ChunLin,
Wang ChihMing,
Lin HsiuMei,
Tseng MeiChun,
Singh Ashutosh S.,
Sun ShihSheng
Publication year - 2018
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201700275
Subject(s) - chemistry , affinities , hydrogen bond , platinum , titration , fluorescence , crystallography , binding affinities , selectivity , crystal structure , proton nmr , stereochemistry , metal ions in aqueous solution , ion , photochemistry , molecule , inorganic chemistry , organic chemistry , catalysis , receptor , biochemistry , physics , quantum mechanics
Two structurally simple Pt(II)‐directed self‐assembly loop complexes were prepared by reactions of cis ‐(PEt 3 ) 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 complex 1 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 complex 1 exhibits excellent binding sensitivity and selectivity for benzoate over acetate in solution via a combination of electrostatic, hydrogen‐bonding, and π–π interactions, whereas complex 2 shows comparable binding affinities toward acetate and benzoate due to the lack of favorable aromatic π–π interaction.