Abstract
The metal(II) coordinating anion 2-(5-amino-3,4-dicyano-2H-pyrrol-2-ylidene)-1,1,2-tricyanoethanide (C11N7H −2 , L′, λmax = 570 nm) has been incorporated by impregnation as the sodium salt in a membrane (0.1 mm thick) of crosslinked polyvinylformal (PVF) at a concentration 1.5 × 10−3 M. The L′-doped PVF membrane, soaked in a concentrated aqueous solution of Cu2+ (0.1 M), changes colour from violet to blue on formation of the corresponding pure bis-pyrrolizinato complex CuL2 (λmax = 660 nm). The CuL2-doped PVF membrane reacts in the gas phase on exposure to species (X) that are copper-coordinating ligands stronger than L, generating the reverse colour change to violet. The remarkable stability towards water of CuL2/PVF is a promising indication for prospective use of ML2 complexes, incorporated in polymeric membranes, for the detection of (X) species in the atmosphere even in the presence of moisture, or directly in aqueous solutions.
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Abbreviations
- \(\overline {MW} \) :
-
average molecular weight;
- wt:
-
weight
- min:
-
minutes
- max:
-
maximum
- M:
-
molar
- c:
-
concentration
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Petrilli, L., Flamini, A. & Poli, N. Incorporation of 2-(5-amino-3,4-dicyano-2H-pyrrol-2-ylidene)-1,1, 2-tricyanoethanide in crosslinked polyvinylformal: Formation and properties of the Copper(II) complex in the matrix. J Incl Phenom Macrocycl Chem 24, 311–323 (1996). https://doi.org/10.1007/BF01041116
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DOI: https://doi.org/10.1007/BF01041116