Browsing by Author "Teixeira, Carlos M."
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- A fluorescente bicyclic Calix[4] Arene-Oxacyclophane with planar chirality: Resolution, chiroptical, properties, and absolute configuration.Publication . Prata, José Virgílio; Costa, Alexandra; Pescitelli, Gennaro; Teixeira, Carlos M.A new inherently chiral calix[4]arene ICC 1 has been disclosed. The dissymmetry of 1 is generated from a chirality plane in the quinol moiety of a 1,3-bridged bicyclic calix[4]arene. ICC 1 has been resolved by enantioselective HPLC, and the chiroptical properties of both isolated antipodes (pS)-1 and (pR)-1 confirm their enantiomeric nature. The absolute configuration of the (pS)-1/(pR)-1 enantiomeric pair was established through time-dependent density functional theory (TDDFT) calculations of electronic circular dichroism (CD) spectra. (C) 2014 Elsevier Ltd. All rights reserved.
- A new fluorescent double-cavity calix[4]arene: synthesis and complexation studies toward nitroanilinesPublication . Teixeira, Carlos M.; Costa, Alexandra; Prata, José VirgílioA novel bicyclic calix[4]arene (4) molecular receptor has been synthesized, and its sensory abilities toward noxious aromatic nitroamines evaluated in apolar media. Molecular host guest interactions examined through fluorescence and H-1 NMR spectroscopies showed the formation of 1:1 type endo-inclusion complexes with all the nitroaniline guests. The potential of 4 as a chemical sensor is established. (C) 2013 Elsevier Ltd. All rights reserved.