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Homogeneous and Heterogeneous Anion Sensing by a Molecular Cobalt–Vanadium Oxide
Author(s) -
Heiland Magdalena,
Seliverstov Andrey,
Schwarz Benjamin,
Anjass Montaha H.,
Streb Carsten
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201605392
Subject(s) - carboxylate , chemistry , ion , halide , cluster (spacecraft) , cobalt , vanadium , inorganic chemistry , oxide , homogeneous , vanadium oxide , stereochemistry , organic chemistry , physics , computer science , thermodynamics , programming language
Spectroscopic anion sensing is a vital non‐invasive tool in chemistry and biology. Here, a molecular cobalt–vanadium‐oxide cluster was shown to be capable of selectively binding and detecting various mono‐anions in solution and immobilized on a solid support. The cluster anion [Co(X)V 4 O 12 ] 3− (X=mono‐anion, for example, halide, pseudohalide, carboxylate, etc.) was formed spontaneously upon anion addition by self‐assembly in solution. The cluster showed distinct spectral changes upon anion binding that could be followed spectroscopically and visually owing to a significant change of the solution color. DFT computations showed that the anion binding observed experimentally was correlated to the relative cluster stabilities. Competitive‐binding studies showed that selective anion binding was possible from a mixture of anions. Immobilization of the anion sensor on silica strips provided access to single‐use dip‐stick sensors for the facile detection of anions in solution. The system presented enables the development of homogeneous or heterogeneous molecular anion sensors with possible applications in chemistry, bio‐medical scenarios, and under harsh environmental conditions.