Abstract
Hydrazino-crown ethers have been synthesized in only 3 or 4 steps starting from 1,2-diacetylhydrazine. The X-ray crystal structure of protonated hydrazino-19-crown-7 (2) showed that one of the hydrazino nitrogen atoms was directed outside the ring cavity. A solvent methanol molecule is held in the cavity of the host ligand by three hydrogen bonds involving two hydrogen atoms bonded to nitrogens of the ligand and the alcohol hydrogen of the methanol. The logK values for the interaction of2 with CH3NH 3+ , Ag+, Pb2+, and Cd2+ were much less than those for the interaction of symmetrical triaza-l8-crown-6 (5) with the same cations. Hydrazino-crown2 reduced silver ions to silver metal when a solution of2 and silver ions in DMSO was allowed to stand for several days.
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Dalley, N.K., Jiang, W., Krakowiak, K.E. et al. Synthesis and structural studies of hydrazino-crown ethers and thermodynamic studies of their interaction with transition, and post-transition metal ions and methyl ammonium ion. J Incl Phenom Macrocycl Chem 8, 299–308 (1990). https://doi.org/10.1007/BF01041886
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DOI: https://doi.org/10.1007/BF01041886