Luminescent Anion Sensing by Transition‐Metal Dipyridylbenzene Complexes Incorporated into Acyclic, Macrocyclic and Interlocked Hosts
| Autor: | Richard C. Knighton, Sophie M. Dapin, Paul D. Beer |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Rotaxane
chemistry.chemical_element 010402 general chemistry 01 natural sciences Chloride Catalysis Metal chemistry.chemical_compound Amide Polymer chemistry medicine platinum ruthenium dipyridylbenzene sensing Host–Guest Systems Full Paper 010405 organic chemistry Chemistry Organic Chemistry General Chemistry Full Papers Ligand (biochemistry) 0104 chemical sciences Ruthenium visual_art Intramolecular force [2]rotaxane visual_art.visual_art_medium Platinum medicine.drug |
| Zdroj: | Chemistry (Weinheim an Der Bergstrasse, Germany) |
| ISSN: | 1521-3765 0947-6539 |
| Popis: | A series of novel acyclic, macrocyclic and mechanically interlocked luminescent anion sensors have been prepared by incorporation of the isophthalamide motif into dipyridylbenzene to obtain cyclometallated complexes of platinum(II) and ruthenium(II). Both the acyclic and macrocyclic derivatives 7⋅Pt, 7⋅Ru⋅PF6, 10⋅Pt and 10⋅Ru⋅PF6 are effective sensors for a range of halides and oxoanions. The near‐infra red emitting ruthenium congeners exhibited an increased binding strength compared to platinum due to the cationic charge and thus additional electrostatic interactions. Intramolecular hydrogen‐bonding between the dipyridylbenzene ligand and the amide carbonyls increases the preorganisation of both acyclic and macrocyclic metal derivatives resulting in no discernible macrocyclic effect. Interlocked analogues were also prepared, and preliminary luminescent chloride anion spectrometric titrations with 12⋅Ru⋅(PF6)2 demonstrate a marked increase in halide binding affinity due to the complementary chloride binding pocket of the [2]rotaxane. 1H NMR binding titrations indicate the interlocked dicationic receptor is capable of chloride recognition even in competitive 30 % aqueous mixtures. A series of acyclic, macrocyclic and mechanically interlocked luminescent anion sensors have been prepared by incorporation of the isophthalamide motif into dipyridylbenzene to obtain cyclometallated complexes of PtII and RuII. Anion titrations with the ruthenium [2]rotaxane demonstrate a marked increase in chloride binding affinity and indicate the interlocked receptor is capable of chloride recognition even in competitive 30 % aqueous mixtures (see figure). |
| Databáze: | OpenAIRE |
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