Answers are grounded in this paper and cite their sources.
Twelve new proton-ionizable, picrylamino-type chromogenic lariat ethers derived from dibenzo-14-crown-4, dibenzo-16-crown-5 and dibenzo-19-crown-6 demonstrate good selectivity and remarkable color response upon extraction of alkali metal cations from basic aqueous solutions into chloroform.
No takes yet. Share an insight, caveat, or question.
Talanova et al. (2001) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: