title: Transition metal ion selective ortho-ester diazophenylcalix[4]arene.
abstract: New chromogenic dizophenylcalix[4]arene 1 showing selective color change to transition metal ions over other alkaline and alkaline earth metal ions has been prepared in the cone conformation and tested for its usefulness.
authors.affiliation: School of Chemistry, Seoul National University, Seoul 151-747, Republic of Korea.
authors.forename: Tae Hyun
authors.initials: TH
authors.lastname: Kim
authors.forename: Su Ho
authors.initials: SH
authors.lastname: Kim
authors.forename: Le Van
authors.initials: le V
authors.lastname: Tan
authors.forename: Yu Jin
authors.initials: YJ
authors.lastname: Seo
authors.forename: Sun Young
authors.initials: SY
authors.lastname: Park
authors.forename: Hasuck
authors.initials: H
authors.lastname: Kim
authors.forename: Jong Seung
authors.initials: JS
authors.lastname: Kim