Complexes of bivalent metal cations in electrospray mass spectra of common organic compounds

2002 ◽  
Vol 37 (6) ◽  
pp. 617-622 ◽  
Author(s):  
Tomasz Bie?kowski ◽  
Agnieszka Brodzik-Bie?kowska ◽  
Witold Danikiewicz
Keyword(s):  
Organic Compounds ◽  
Mass Spectra ◽  
Metal Cations ◽  
Bivalent Metal

Mass Spectrometric Behaviour of Carboxylated Polyethylene Glycols and Carboxylated Octylphenol Ethoxylates

2003 ◽  
Vol 9 (3) ◽  
pp. 165-173 ◽  
Author(s):  
Magdalena Frańska ◽  
Agnieszka Zgoła ◽  
Joanna Rychłowska ◽  
Andrzej Szymański ◽  
Zenon Łukaszewski ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Alkali Metal ◽  
Mass Spectra ◽  
Secondary Ion Mass Spectrometry ◽  
Metal Cations ◽  
Mass Spectrometric ◽  
Polyethylene Glycols ◽  
Alkali Metal Cations ◽  
Secondary Ion

The mass spectrometric behaviour of mono- and di-carboxylated polyethylene glycols (PEGCs and CPEGCs) and carboxylated octylphenol ethoxylates (OPECs) is discussed. The tendency for ionisation (deprotonation, protonation and cationisation by alkali–metal cations) of carboxylated PEGs was compared with that of non-carboxylated analogues by using both secondary-ion mass spectrometry (SIMS) and electrospray ionisation (ESI). The fragmentation of the PEGCs and CPEGCs is discussed and also compared with their neutral analogues, PEGs. B/E linked-scan mass spectra were recorded, using secondary-ion mass spectrometry as a method for ion generation, for deprotonated and protonated molecules as well as for molecules cationised by alkali–metal cations. The fragmentation behaviour of PEGs is found to be different from that of CPEGCs, The presence of carboxyl groups may be confirmed not only by the determination of molecular weights of the ethoxylates studied, but also on the basis of the fragment ions formed. The metastable decomposition of the [OPEC-H]− ions proceeds through the cleavage of the bond between the octylphenol moiety and the ethoxylene chain and leads to the octylphenoxyl anions. It permits determination of the mass of the hydrophobic moiety of the studied carboxylated alkylphenol ethoxylate. ESI mass spectra recorded in the negative-ion mode were found to be more suitable than SI mass spectra for the determination of the average molecular weight of carboxylated ethoxylates.

Approach for structural interpretation of laser microprobe mass spectra of organic compounds

1985 ◽  
Vol 57 (14) ◽  
pp. 2944-2951 ◽  
Author(s):  
Luc. Van Vaeck ◽  
Jan. Claereboudt ◽  
Johan. De Waele ◽  
Eddy. Esmans ◽  
Renaat. Gijbels
Keyword(s):  
Organic Compounds ◽  
Mass Spectra ◽  
Structural Interpretation ◽  
Laser Microprobe ◽  
Laser Microprobe Mass

Some Specific Molecular Rearrangements in the Mass Spectra of Organic Compounds

1959 ◽  
Vol 63 (11) ◽  
pp. 1861-1868 ◽  
Author(s):  
J. H. Beynon ◽  
G. R. Lester ◽  
A. E. Williams
Keyword(s):  
Organic Compounds ◽  
Mass Spectra ◽  
Molecular Rearrangements

Synthesen mit aliphatischen Dialdehyden, XXVII [1] Eine „non-template“-Synthese zur Darstellung metallfreier 1.4.8.11-Tetraaza [14] annulen-Derivate / Syntheses with Aliphatic Dialdehydes, XXVII [1] A Non-Template Synthesis for the Preparation of Metal-Free 1,4,8,11-Tetraaza[14]annulene Derivatives

1978 ◽  
Vol 33 (9) ◽  
pp. 1012-1015 ◽  
Author(s):  
Christian Reichardt ◽  
Wolfgang Scheibelein
Keyword(s):  
Acetic Acid ◽  
Template Synthesis ◽  
Mass Spectra ◽  
Metal Cations ◽  
Metal Free ◽  
Ethanol Acetic Acid ◽  
Chelate Ligands

The reaction of 2-substituted malonaldehydes (7) with aromatic 1,2-diamines (5 or 6) in ethanol/acetic acid (10:1) leads to 6,13-disubstituted 1,4,8,11 -tetraaza[14]annulene derivatives (8 or 9) even in the absence of coordinating metal cations ("non-template" synthesis), and not to 3-substituted 1,5-benzodiazepines such as 4. Cobalt(II), nickel(II), and copper(II) complexes of the macrocyclic chelate ligands 8 and 9 have been observed by subsequent metallization with the corresponding acetates in N,N-dimethylformamide. The structures of 8-11 have been assigned mainly by their mass spectra.

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