Calix[4]resorcinarenes functionalized with pendant α-acetates or α-(diethyl acetamides) [(n-C11H23)4−C[4]R−(OCH2COX)8; 1, X = OMe; 2, X = NEt2] have been shown to incorporate terbium(III) ions into
Langmuir−Blodgett films. Energy-transfer luminescence from a single monolayer on quartz has been
demonstrated. An excitation wavelength of 280 nm, corresponding to the chromophore of the ligands
aromatic rings, was used. Emission was observed at 489, 545.5, 586, and 620 nm, corresponding to the
known transitions of terbium (5D4 → 7F6, 5D4 → 7F5, 5D4 → 7F4, and 5D4 → 7F3, respectively). It was
demonstrated that a multilayer LB film of 1 and a monolayer film of 2 readily abstract terbium(III) from
2 × 10-4 M aqueous solutions of TbCl3 and that energy-transfer luminescence was subsequently exhibited.
Three-dimensional transesophageal ultrasound of the spinal cord is a new and promising imaging modality that could easily be used clinically for real-time evaluation of the spinal cord anatomy or for intraoperative guidance.
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