Metal Ion Sensing Novel Calix[4]crown Fluoroionophore with a Two-Photon Absorption Property

• Published in: Journal of organic chemistry 2006-10, Vol.71 (21), p.8016-8022
• Main Authors: Kim, Jong Seung, Kim, Hyun Jung, Kim, Hwan Myung, Kim, Su Ho, Lee, Jeong Won, Kim, Sung Kuk, Cho, Bong Rae
• Format: Article
• Language: English
• Subjects: Alicyclic compounds; Alicyclic compounds, terpenoids, prostaglandins, steroids; Calixarenes - chemistry; Chemistry; Coordination compounds; Exact sciences and technology; Inorganic chemistry and origins of life; Organic chemistry; Phenols - chemistry; Preparations and properties
• ISSN: 0022-3263; 1520-6904
• DOI: 10.1021/jo0610098

1,3-Alternate calix[4]arene-based fluorescent chemosensors bearing two-photon absorbing chromophores have been synthesized, and their sensing behaviors toward metal ions were investigated via absorption band shifts as well as one- and two-photon fluorescence changes. Free ligands absorb the light at 461 nm and weakly emit their fluorescence at 600 nm when excited by UV−vis radiation at 461 nm, but no two-photon excited fluorescence is emitted by excitation at 780 nm. Addition of an Al3+ or Pb2+ ion to a solution of the ligand causes a blue-shifted absorption and enhanced fluorescence due to a declined resonance energy transfer (RET) upon excitation by one- and two-photon processes. Addition of a Pb2+ ion to a solution of 1·K+ results in a higher fluorescence intensity than the original 1·Pb2+ complex regardless of one- or two-photon excitation, due to the allosteric effect induced by the complexation of K+ with a crown loop.