Photochemistry of the adduct between [Co(CN)5H2O]2- and the polyammonium macrocyclic receptor [32]ane-N8: evidence for the supramolecular structure

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Abstract

The photochemistry of aqueous solutions of [Co(CN)5H2O]2- in the presence of the polyammonium macrocyclic receptor [32]ane-N8H88+ was studied. The quantum yield for cyanide release in free [Co(CN)5H2O]2- (Φ=0.003 at 313 nm, pH 1.5) is reduced approximately threefold in the presence of the protonated macrocycle, which provides evidence for the formation of a supramolecular structure. Further evidence for the supramolecular structure is obtained from the thermal anation of [Co(CN)5H2O]-2 with Br- (40 °C, pH 1.0), the rate of which is increased in the presence of [32]ane-N8H88+, suggesting that the ligand water is not involved in hydrogen bonds with the macrocycle. These results are interpreted in terms of possible supramolecular structures.

Original languageEnglish
Pages (from-to)337-343
Number of pages7
JournalJournal of Photochemistry and Photobiology, A: Chemistry
Volume66
Issue number3
DOIs
Publication statusPublished - 30 Jun 1992

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