Fast atom bombardment mass spectrometry of new polydentate Schiff bases. 3. The case of mono- and bis aldimine containing benzo-5-crown-5 groups

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Eur. J. Mass Spectrom. 1, 65 - 72 (1995)

Fast atom bombardment mass spectrometry of new polydentate Schiff bases. 3. The case of mono- and bis aldimine containing benzo-5-crown-5 groups

Elvio Bullita, Sergio Tamburini, Pietro Alessandro Vigato
Istituto di Chimica e Tecnologie Inorganiche e dei Materiali Avanzati, CorsoStati Uniti 4, I- 35020 Padova, Italy
Massimo Carbini
Istituto di Chimica Industriale, Facoltà di Ingegneria, via Marzolo 9, I-35100 Padova, Italy
Silvia Catinella and Piero Traldi^*
CNR, Area di Ricerca, Corso Stati Uniti 4, I-35020 Padova, Italy

ABSTRACT:

The mass spectrometric behaviour of five polydentate Schiff bases derived from the condensation of formyl or diformyl precursors(2,3-dihydroxybenzaldehyde, 2-hydroxy-3-methoxybenzaldehyde, 4-methyl-2,6-diformylphenol, 2,6- diformyl-pyridine or 2,2-(ethylenedioxy)dibenzaldehyde with 4-amino-benzo-5-crown-5 has been investigated by fast atom bombardment and metastable ion studies. The mass spectra mainly exhibit the results of decomposition processes related to the crown moiety. Only for two compounds have cleavages of the aldimine group been demonstrated. This behaviour is explained either by protonation on specific sites or by the occurrence of resonance phenomena.

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