Fluorescent Photoinduced Electron Transfer (PET) Sensing Molecules with p-Phenylenediamine as Electron Donor
摘要:
Fluorescent photoinduced electron-transfer sensors were made from p-phenylenediamine-substituted azacrown ethers attached with a dansyl group, in which the p-phenylenediamine moiety serves as electron donor and the dansyl group acts as the acceptor. Chelation-enhanced fluorescence was observed upon addition of metal salts. Selective fluorescence response was observed for Mg2+ and/ or Ca2+ versus Na+ and K+ due to size match and charge density sensitivity of the p-phenylenediamine moiety.
Fluorescence and NMR Binding Studies of <i>N</i>-Aryl-<i>N</i>‘-(9-methylanthryl)diaza-18-crown-6 Derivatives
作者:Anthony J. Pearson、Wenjing Xiao
DOI:10.1021/jo030060y
日期:2003.6.1
N-Aryl-N'-(9-methylanthryl)diaza-18-crown-6 derivatives perform as fluorescent photoinduced electron-transfer (PET) sensors with very selective response toward Ca(2+) versus Mg(2+), Na(+), and K(+). The fluorescence intensity was increased by a factor of up to 170 in the presence of Ca(ClO(4))(2). (1)H NMR studies show that metal cations affect these molecules very differently: Ca(2+) has a global
Fluorescent Photoinduced Electron Transfer (PET) Sensing Molecules with <i>p</i>-Phenylenediamine as Electron Donor
作者:Anthony J. Pearson、Wenjing Xiao
DOI:10.1021/jo030059z
日期:2003.6.1
Fluorescent photoinduced electron-transfer sensors were made from p-phenylenediamine-substituted azacrown ethers attached with a dansyl group, in which the p-phenylenediamine moiety serves as electron donor and the dansyl group acts as the acceptor. Chelation-enhanced fluorescence was observed upon addition of metal salts. Selective fluorescence response was observed for Mg2+ and/ or Ca2+ versus Na+ and K+ due to size match and charge density sensitivity of the p-phenylenediamine moiety.
Preparation of <i>N</i>-Aryl Azacrown Ether Derivatives, Using Arene−Iron Chemistry
作者:Anthony J. Pearson、Wenjing Xiao
DOI:10.1021/jo020527p
日期:2003.3.1
m- or p-phenylenediamine and m- or p-chlorophenyl-substituted azacrown ether derivatives were synthesized through sequential nucleophilic substitution of [(eta(5)-cyclopentadienyl)(eta(6)-(m- or p-dichlorobenzene))]iron hexafluorophosphate by azacrown ethers and cyclohexaamines. Monoarylation is the main reaction for diazacrown ethers. The overall yield from the starting complex is 50-96% for multiple