Journal of the Mass Spectrometry Society of Japan
Online ISSN : 1880-4225
Print ISSN : 1340-8097
ISSN-L : 1340-8097
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Volume 56, Issue 6
Displaying 1-4 of 4 articles from this issue
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INTEGRATED PAPER
  • Application of Mass Spectrometry to Coordination Chemistry
    Ryuichi ARAKAWA
    2008 Volume 56 Issue 6 Pages 247-262
    Published: December 01, 2008
    Released on J-STAGE: December 15, 2008
    DOIhttps://doi.org/10.5702/massspec.56.247
    JOURNAL FREE ACCESS
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    Application of electrospray ionization mass spectrometry (ESI-MS) to coordination chemistry has been extended in recent years. Here, we examined a number of polynuclear ruthenium(II), rhodium(III), and cobalt(III) bipyridine complexes by ESI-MS. It was shown that ESI-MS is a useful tool for identifying metal complexes and detecting contamination, because ESI mass spectra for the complexes displayed a mass pattern simple enough for easy structural assignment. In coordination chemistry, the actual advantages of ESI-MS are as follows: (1) ionic metal complexes exhibit simple mass spectra that can be analyzed easily using the characteristic isotope distribution of transition metals, (2) the metal complexes yield multiply charged ions with loss of counter ions so that the multinuclearity of polymetallic complexes and self-assembled complexes in a solution can be determined, and (3) most importantly, since preformed ions in bulk solution are extracted to the gas phase in the soft ESI process, the observed mass spectra qualitatively reflect only the intact ions in the solution. We detected unstable species of Se or W complexes that exists only in very strongly basic or acidic solvents using the nanospray technique. Moreover, we also studied the application of chiral recognition using antimony potassium tartrate and the characterization of the self-assembly of ferrocenedicarboxylic acid in a solution by ESI-MS. The ESI technique combined with a flow-through reaction cell is a powerful tool for the detection of reaction intermediates and primary products. Finally, photosubstitution of Ru(II) complexes, photo-induced metal release/inclusion of crowned malachite green leuconitrile derivatives, and electrolytic oxidations of Ru(II) and Os(II) complexes were investigated using online ESI-MS systems.
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COMMENTARIES
  • Why Can Reflectron Mode in Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry Perform MS/MS-like Analysis?
    Koichi TANAKA, Ken-ichi YOSHINO, Tomoya KINUMI, Mitsuo TAKAYAMA
    2008 Volume 56 Issue 6 Pages 263-268
    Published: December 01, 2008
    Released on J-STAGE: December 15, 2008
    DOIhttps://doi.org/10.5702/massspec.56.263
    JOURNAL FREE ACCESS
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    By measurement of post-source decay (PSD) product ion mass spectrum, matrix-assisted laser desorption/ionization (MALDI) time-of-flight mass spectrometry (TOFMS) enable mass spectrometry/mass spectrometry (MS/MS)-like analysis to obtain structural information. We will explain the basics of MS/MS-like analysis in reflectron mode of MALDI TOFMS by comparing post-source decay product ion mass spectrum acquired by the standard reflectron and the curved field reflectron.
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  • Units of Atomic Mass; “u,” “Da,” “amu,” and “mmu”
    Ken-ichi YOSHINO
    2008 Volume 56 Issue 6 Pages 269-274
    Published: December 01, 2008
    Released on J-STAGE: December 15, 2008
    DOIhttps://doi.org/10.5702/massspec.56.269
    JOURNAL FREE ACCESS
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    The unified atomic mass unit (unit symbol: u) is a non-SI unit of mass, defined as one-twelfth the mass of a single 12C atom in its ground state. [SI: Le Système International d'Unités; The International System of Units] This definition was agreed upon by both the International Union of Pure and Applied Physics (IUPAP) and the International Union of Pure and Applied Chemistry (IUPAC) in the early 1960s to resolve a longstanding difference between two scales of the atomic mass unit. The term “atomic mass unit” (unit symbol: amu) has been used as a unit of mass defined as one-sixteenth the mass of a single atom 16O [m(16O)=16 amu] in physics and as one-sixteenth the isotope-averaged atomic mass (equivalent to the atomic weight) of oxygen [Ar(O)=16 amu] in chemistry.
    The unit dalton (unit symbol: Da) is also a non-SI unit of mass defined as “1 Da=1 u,” and is accepted as a unit for use by the SI in the 8th edition of the SI brochure (2006). Therefore, both the unified atomic mass unit and dalton are authorized units for mass of ions and molecules.
    It is a common mistake to use the deprecated term “atomic mass unit” and the deprecated unit symbol “amu” for the unit of mass defined as one-twelfth the mass of single atom 12C. The unit symbol “mmu,” meaning a millimass unit, is also an appropriate unit in SI. Instead of “mmu,” “mDa” or and “10-3 u” should be used.
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Letter to the Editor
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