Synthesis of neutral, water-soluble calix[4]arenes

Novel neutral water-soluble calix[4]arenes were synthesized via chlorosulfonylation of lower rim functionalized calix[4]arenes followed by reaction with hydroxyl group containing amines. The solubility of these calix[4]arenes sulfonamides in water varies from ∼ 10-5 to 3.1⋅10-1 M. A route via hydrophobically protected amines improves the purification

Near-infrared luminescence of Yb3+, Nd3+, and Er3+ azatriphenylene complexes

Near-infrared luminescent ytterbium(III), neodymium(III), and erbium(III) complexes containing novel organic chromophores derived from azatriphenylene have been prepared and spectroscopically studied. The complexes can be excited from 350 to 450 nm, leading after intramolecular energy transfer to intense lanthanide luminescence in acetonitrile. Quenching of the luminescence of the complexes by molecular oxygen reveals information on the rate of energy transfer from the “antenna” to the lanthanide ion

Diazatriphenylene complexes of Eu3+ and Tb3+; promising light-converting systems with high luminescence quantum yields

Diazatriphenylene (1) displays the unique property that it sensitizes the long lived luminescence of both Tb3+ and Eu3+ with high efficiency (quantum yields of 0.55 and 0.41, respectively) while allowing near UV excitation ( <340 nm), which makes the lanthanide complexes of 1 very suitable for time-resolved multi-probe detection

Diazatriphenylene complexes of Eu3+ and Tb3+; promising light-converting systems with high luminescence quantum yields

Diazatriphenylene (1) displays the unique property that it sensitizes the long lived luminescence of both Tb3+ and Eu3+ with high efficiency (quantum yields of 0.55 and 0.41, respectively) while allowing near UV excitation ( <340 nm), which makes the lanthanide complexes of 1 very suitable for time-resolved multi-probe detection

Water-soluble neutral calix[4]arene-lanthanide complexes: synthesis and luminescence properties

Water-soluble calix[4]arenes 10a,b with chromophores ("antenna") attached to the lower rim via a short spacer are described. In the neutral lanthanide complexes of 10a,b photoexcitation of the antenna induces lanthanide emission via intramolecular energy transfer. Calix[4]arene 10b with a chrysene moiety as sensitizer shows strong lanthanide emission for Eu3+ with an excitation maximum at ^ = 363 nm