Optimization of fast atom bombardment (FAB) mass spectra of arsenobetaine and arsenocholine

1995 ◽  
Vol 9 (8) ◽  
pp. 719-720
Author(s):  
M. H. Florêncio ◽  
M. F. Duarte ◽  
A. Bettencourt
Keyword(s):  
Mass Spectra ◽  
Fast Atom Bombardment ◽  
Fab Mass Spectra

Fast Atom Bombardment Mass Spectrometry of the Vitamin B12 Analogues Hydrogenobalamin and Cupribalamin

1984 ◽  
Vol 39 (2) ◽  
pp. 248-251 ◽  
Author(s):  
Lutz Grotjahn ◽  
Volker B. Koppenhagen ◽  
Ludger Ernst
Keyword(s):  
Mass Spectrometry ◽  
Mass Spectrum ◽  
Mass Spectra ◽  
Fast Atom Bombardment ◽  
Metal Clusters ◽  
Cobalt Atom ◽  
Vitamin B ◽  
Metal Free ◽  
Characteristic Fragment ◽  
Fab Mass Spectra

Hydrogenobalam in (metal-free vitamin B12) and cupribalamin are characterized by their fast atom bombardment (FAB) mass spectra which show molecular ion and characteristic fragment ion peaks. These spectra and the high-resolution FAB mass spectrum of cobalamin (vitamin B12) show that the (M+H)+-CN-59 peak for the latter is due to loss of acetamide and not of the central cobalt atom. In the FAB mass spectrum of cupribalamin metal clusters are observed

Ligand Exchange in FAB Mass Spectrometry of Monomerie and Dimeric Corrinoids

1984 ◽  
Vol 39 (11) ◽  
pp. 1548-1552 ◽  
Author(s):  
Lutz Grotjahn ◽  
Ludger Ernst
Keyword(s):  
Mass Spectrometry ◽  
Ligand Exchange ◽  
Mass Spectra ◽  
Fast Atom Bombardment ◽  
Molecular Ions ◽  
Negative Ion ◽  
Fab Mass Spectrometry ◽  
Fab Mass Spectra

Abstract In the Fast Atom Bombardment (FAB) mass spectra of monomeric and dimeric corrinoids, exchange of metal-bound ligands against matrix particles is observed which leads to pseudo molecular ions. Negative ion FAB mass spectra in particular, give distinct information on the intact molecular units.

Fast-atom Bombardment (FAB) Mass Spectra of Nitrile or Cyanamide Complexes with the {M(Ph2PCH2CH2PPh2)2}n+ (M=Fe or Re) Metal Sites. Application to Reactions Induced under FAB Conditions

1996 ◽  
Vol 10 (4) ◽  
pp. 447-454 ◽  
Author(s):  
Luísa M. D. R. S. Martins ◽  
M. Fátima C. Guedes da Silva ◽  
Indalécio Marques ◽  
Joäo J. R. Fraústo da Silva ◽  
M. Cândida N. Vaz ◽  
...  
Keyword(s):  
Mass Spectra ◽  
Fast Atom Bombardment ◽  
Fab Mass Spectra

Fast atom bombardment (FAB) mass spectra of protein digests: Hen and duck egg-white lysozymes

1984 ◽  
Vol 11 (11) ◽  
pp. 549-556 ◽  
Author(s):  
Toshifumi Takao ◽  
Masakuni Yoshida ◽  
Yeong-Man Hong ◽  
Saburo Aimoto ◽  
Yasutsugu Shimonishi
Keyword(s):  
Mass Spectra ◽  
Fast Atom Bombardment ◽  
Egg White ◽  
Protein Digests ◽  
Duck Egg ◽  
Fab Mass Spectra

A comparison of the electron impact and fast atom bombardment mass spectra of some group IV organometallic halides

1985 ◽  
Vol 63 (8) ◽  
pp. 2308-2312 ◽  
Author(s):  
Jack M. Miller ◽  
Adrian Fulcher
Keyword(s):  
Electron Impact ◽  
Condensed Phase ◽  
Mass Spectra ◽  
Fast Atom Bombardment ◽  
Group Iv ◽  
Major Exception ◽  
Positive Ion ◽  
Fab Mass Spectra ◽  
Primary Ionization

The positive ion fast atom bombardment (FAB) mass spectra of a series of group IV organometallic halides, (phenyl)3MCl (M = Ge, Sn, Pb), (phenyl)3PbX (X = Cl, Br, I) and Sn(phenyl)nCl4−n are reported in a sulfolane matrix, and compared to their corresponding EI spectra. The use of other matrix liquids such as glycerol thioglycerol, diamylphenol, 18-crown-6/tetraglyme, and p-nitrophenyloctylether are discussed. Disappointingly FAB, like EI, does not produce significant parent ions for group IV organometallics. The FAB and EI spectra are remarkably similar with one major exception. In EI, the loss of a phenyl is preferred over the loss of a halide, while in FAB the reverse is the case, strongly suggesting that the primary ionization occurs in the condensed phase.

Synthesis and fast atom bombardment mass spectrometry of the coordination complexes of the ligand 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane

1989 ◽  
Vol 67 (5) ◽  
pp. 797-803 ◽  
Author(s):  
Cindy Lee MacLaurin ◽  
Jack Martin Miller ◽  
Mary Frances Richardson
Keyword(s):  
Mass Spectrometry ◽  
Mass Spectra ◽  
Fast Atom Bombardment ◽  
Spectroscopic Properties ◽  
Coordination Complexes ◽  
Negative Ion ◽  
Successful Technique ◽  
Negative Ion Mode ◽  
Positive Ion ◽  
Fab Mass Spectra

Metal complexes containing the ligand 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazatetradecane were synthesized and characterized using electron impact (EI) and fast atom bombardment (FAB). The FAB mass spectra were obtained in positive and negative ion mode. FAB in the positive ion mode proved to be the most successful technique for the identification of these compounds. The majority of the FAB spectra obtained were structurally informative, although not all showed molecular (M+) or quasimolecular ([M + H]+) ions. The fragmentations observed were characteristic of the ligands and the metal, and were interpreted based on the chemical and spectroscopic properties of these compounds. Keywords: FAB mass spectroscopy, tetraazacyclotetradecane complexes.

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