Abstract
N, N′-Bis(tropon-2-yl)diazacrown ethers (2) were found to display unique absorption spectral changes in the presence of guest cations. X-ray crystallographic analysis indicated that 2a·zinc and 2c·calcium thiocyanate complexes consist of an ion pair with zinc tetrathiocyanate anion and 2a·zinc cation, and with calcium hexathiocyanate anion and 2c·H2O·calcium cation, respectively. Complexation gave rise to deconjugation between the tropone ring and the lone pair electrons of the nitrogen atom to cause spectral changes.
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