Naslov
UV-Vis and ESI MS/MS Study of Calix[4]arene Derivatives and Their Lanthanide Complexes

Autori
Tranfić Bakić, Marina ; Espinosa, Mariela Soledad ; Cindro, Nikola ; Frkanec, Leo ; Babay, Paola Alejandra ; Galić, Nives

Izvornik
Croatica chemica acta (0011-1643) 90 (2017), 4; 679-687

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
calixarenes, lanthanides, electrospray mass spectrometry, UV-Vis spectroscopy

Sažetak
: Coordination properties of calix[4]arenes bearing substituents on the lower rim: tetraethyl ester (1), tetraethylamide (2), and newly synthesized tetraethylmethylamide derivative (3), towards selected lanthanide cations (La3+, Eu3+, Yb3+) were studied by spectrophotometric titrations. No complexation was observed with ester derivative, while amide derivatives formed 1:1 complexes and bound lanthanide cations very efficiently (lgKLa2 = 5.1 ; lgKEu2 ≥ 6 ; lgKYb2 ≥ 6 ; lgKLa3 ≥ 6 ; lgKEu3 ≥ 6 ; lgKYb3 ≥ 6). The ligands and complexes were also analysed by ESI MS and MS/MS spectrometry. Both inductive cleavage and proton rearrangement fragmentation reactions were observed. Corresponding fragmentation pathways were proposed. The results obtained by MS analysis were in accordance with those obtained by spectrophotometric titrations.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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