Azidocryptands–synthesis, structure, and complexation properties
作者:Christina Tönshoff、Klaus Merz、Götz Bucher
DOI:10.1039/b413395a
日期:——
Cryptands bearing an intraannular azido substituent have been synthesized and characterized spectroscopically. Their complexation properties were investigated by picrate extraction analysis. The oxygen-containing cryptands were found to be good ligands for alkali cations, with a preference for Li(+) and Na(+). The molecularstructure of the complex with KBr was determined by X-ray crystallography.
Photochemistry of an Azido-Functionalized Cryptand: Controlling the Reactivity of an Extremely Long-Lived Singlet Aryl Nitrene by Complexation to Alkali Cations
Photolysis of the cryptand 1, bearing an intraannular azido substituent, results in a complexphotochemistry. Low-temperature photolysis yields the triplet nitrene (3)2, which has been characterized by EPR spectroscopy. Small differences in ZFS parameters are detected between the uncomplexed nitrene-functionalized ligand (in EtOH: D' = 0.93 cm(-1)) and its sodium (NaBr@(3)2 in EtOH: D' = 0.88 cm(-1))