Identification of luminescent europium beta-diketonates using high-resolution emission spectrometry and direct-inlet electron ionization mass spectrometry.
The high-resolution emission spectra measured using a microscope Raman spectrometer and direct-inlet electron ionization mass spectrometry (DI-EIMS) were studied for the rapid analysis of a trace amount of various europium beta-diketonates in order to utilize them as fluorescent markers. Five kinds of europium beta-diketonates were distinguished from the emission spectra obtained using the Raman spectrometer. For DI-EIMS, the electron ionization mass spectra of the europium beta-diketonates showed the characteristic fragment ion peaks due to the isotope effect of 151Eu and 153Eu. The DI-EIMS was very useful for identifying the compounds compared with spectrofluorometry. The scan and selected ion-monitoring modes of DI-EIMS showed the detection limits of the samples at levels of hundreds and tens of nanograms (ng), respectively.
Kurata
S
S
Criminal Investigation Laboratory, Metropolitan Police Department, Chiyoda, Tokyo 100-8929, Japan.
Nagai
M
M
D005063:Europium / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D007202:Indicators and Reagents; D009942:Organometallic Compounds / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D021241:Spectrometry, Mass, Electrospray Ionization; D013059:Spectrum Analysis, Raman
D005456:Fluorescent Dyes; D007202:Indicators and Reagents; D009942:Organometallic Compounds; D005063:Europium