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Fast atom bombardment of some asymmetric compartmental [1 +1] Schiff bases

✍ Scribed by Martina D'Alpaos; Sergio Tamburini; Patrizia Tomasin; Pietro Alessandro Vigato; Pietro Traldi

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
193 KB
Volume
11
Category
Article
ISSN
0951-4198

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✦ Synopsis

New compartmental ligands (L), containing a N 2 O 2 or N 3 O 2 Schiff base and an O 2 O 4 , O 2 O 5 or O 2 O 6 'crown like' coordination site, have been prepared by reaction of the appropriate diformyl-and polyamine precursors. The related amine derivatives have been obtained by reduction of the imine analogues with NaBH 4 . The mass spectrometric behaviour of these compounds has been studied by fast atom bombardment mass spectrometry, which mainly leads to the facile production of protonated [MH] + and cationized [MNa] + molecules. The mass analysed ion kinetic energy spectra of these ionic species show that the primary fragmentation patterns strongly depend on the crown dimensions and on the imine-amine structure of the nitrogen-containing chain. Macrocyclic rare earth complexes Me(L)(H 2 O) 4 (Cl) 3 (Me = Ce, Y), prepared by a template procedure, have been also studied under the same experimental conditions, proving that the presence of the metal ion leads to a strong reduction of the number of primary decomposition pathways.

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