In:
Rapid Communications in Mass Spectrometry, Wiley, Vol. 23, No. 13 ( 2009-07-15), p. 1927-1933
Abstract:
Some newly synthesized 10 B nido ‐carborane derivatives, i.e., 7,8‐dicarba‐ nido‐ undecaborane monoanions ([7‐Me‐8‐R‐C 2 B 9 H 10 ] ‐ K + , R = H, butyl, hexyl, octyl and decyl), have been fully characterised and examined by electrospray ionization and Fourier transform ion cyclotron resonance mass spectrometry with liquid chromatographic separation (LC/ESI‐FTICR‐MS). These boron‐containing compounds exhibit abundant molecular ions ([M] − ) at m/z 140.22631 [C B 9 H 14 ] − , m/z 196.28883 [C B 9 H 22 ] − , m/z 224.32032 [C B 9 H 26 ] − , m/z 252.35133 [C B 9 H 30 ] − and m/z 280.38354 [C B 9 H 34 ] − at the normal tube lens voltage setting of −90 V, which was an instrumental parameter value selected in the tuning operation. Additional [M– n H 2 ] − ( n = 1−4) ions were observed in the mass spectra when higher tube lens voltages were applied, i.e., −140 V. High‐resolution FTICR‐MS data revealed the accurate masses of fragment ions, bearing either an even or an odd number of electrons. Collision‐induced dissociation of the [M– n H 2 ] − ions ( n = 0–4) in the quadrupole linear ion trap (LTQ) analyzer confirmed the loss of hydrogen molecules from the molecular ions. It is suggested that the loss of H 2 molecules from the alkyl chain is a consequence of the stabilization effect of the nido ‐carborane charged polyhedral skeleton. Copyright © 2009 John Wiley & Sons, Ltd.
Type of Medium:
Online Resource
ISSN:
0951-4198
,
1097-0231
Language:
English
Publisher:
Wiley
Publication Date:
2009
detail.hit.zdb_id:
2002158-6
detail.hit.zdb_id:
58731-X
SSG:
11
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