End-group characterization of poly(methylphenylsilane) by alkali metal salts doped MALDI-TOF mass spectra

1996 ◽  
Vol 197 (9) ◽  
pp. 2615-2625 ◽  
Author(s):  
Giorgio Montaudo ◽  
Maurizio S. Montaudo ◽  
Concetto Puglisi ◽  
Filippo Samperi ◽  
Maurice Sepulchre
Keyword(s):  
Alkali Metal ◽  
Mass Spectra ◽  
Metal Salts ◽  
Alkali Metal Salts ◽  
Maldi Tof ◽  
Maldi Tof Mass Spectra ◽  
End Group

scholarly journals Characterization of aliphatic hyperbranched polyesters by MALDI-TOF mass spectrometry

2007 ◽  
Vol 61 (6) ◽  
pp. 333-341
Author(s):  
Jasna Vukovic ◽  
Slobodan Jovanovic ◽  
Manfred Lechner
Keyword(s):  
Mass Spectrometry ◽  
Mass Spectra ◽  
Degree Of Polymerization ◽  
Side Reactions ◽  
Maldi Tof Ms ◽  
Hyperbranched Polyesters ◽  
Maldi Tof ◽  
Maldi Tof Mass Spectra ◽  
Tof Ms

In this work, MALDI-TOF mass spectrometry was used for the characterization of aliphatic hyperbranched polyesters (AHBP), synthesized from 2,2-bis(hydroxymethyl)propionic acid (bis-MPA) and di-trimethylolpropane. From the obtained results it was concluded that it was not possible to take complete advantages of MALDI-TOF MS in this particular case, since the AHBP used in this work were polydisperse. The intensity of the signals from the high mass tail of these samples (pseudo generation higher than four) was underestimated and insufficient to distinguish it from the baseline and to use it for the analysis of the spectra. As a consequence of that, lower values of the Mn were obtained. At the same time, Mw were also underestimated, which led to very low values of the polydispersity index. On the other hand, it was possible to obtain molar masses of individual molecules from the MALDI-TOF mass spectra of AHBP and to qualitatively determine the extent of cyclization (side reactions) at each degree of polymerization. Using the adequate set of equations and results obtained from MALDI-TOF mass spectra of AHBP, every signal from the spectra was identified. The obtained results show that formation of poly(bis-MPA), intramolecular esterification and intramolecular etherification occurred as side reactions during the synthesis of these polyesters. The relative amount of the cycles increases with the number of pseudo generation (from the second up to the fifth pseudo generation). It was also observed that the relative proportion of the signals which represent cyclic structures increases with the increasing degree of polymerization. In this work the basic principles of MALDI-TOF MS are also presented, as well as, a review of adequate published articles.

Design, synthesis and isolation of a new 1,2,5-selenadiazolidyl and structural and magnetic characterization of its alkali-metal salts

2019 ◽  
Vol 43 (41) ◽  
pp. 16331-16337
Author(s):  
Nikolay A. Semenov ◽  
Ekaterina A. Radiush ◽  
Elena A. Chulanova ◽  
Alexandra M. Z. Slawin ◽  
J. Derek Woollins ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Alkali Metal ◽  
Electron Acceptor ◽  
Radical Anion ◽  
Metal Salts ◽  
Alkali Metal Salts ◽  
Magnetic Characterization ◽  
Design Synthesis

A new electron acceptor is synthesized and reduced into its radical-anion isolated in the form of two salts with different structures and magnetic properties.

Synthesis and Characterization of Alkali-Metal Salts of 2,2′- and 2,4′-Bipyridyl Radicals and Dianions

2009 ◽  
Vol 48 (17) ◽  
pp. 8304-8316 ◽  
Author(s):  
Edward Gore-Randall ◽  
Mark Irwin ◽  
Mark S. Denning ◽  
Jose M. Goicoechea
Keyword(s):  
Alkali Metal ◽  
Metal Salts ◽  
Synthesis And Characterization ◽  
Alkali Metal Salts
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