ScienceAsia 21 (1995): 051-061 |doi: 10.2306/scienceasia1513-1874.1995.21.051

GAS CHROMATOGRAPHY- MASS SPECTROMETRY OF SOME VOLATILE METAL - DIKETONATES

WANNA SRICHUANCHUENSKUL,^a MONGKON RAYANAKORN,^b,* SURASAK WATANESK,^b PRASAK THAVORNYUTIKARN^b AND PISAN KITSAWATPAIBOON^b

ABSTRACT: A gas chromatographic-mass spectrometric method was investigated for use in the study of the analytical characteristics of some volatile aluminium and chromium -diketonates employing acetylacetone and trif!uoroacetylacetone as ligands. Aluminium and chromium chelates were well separated on a fused silica capillary column of 25 m length and 0.20 mm i.d. Mass spectra, obtained via an electron impact ionization source with a quadrupole mass analy:ar under normal operating conditions, yielded the unique base peak pattern corresponding to the loss of one ligand from the molecular ion. Chromium (III) as 1,1,1-trifluoroacetylacetonate complex alone exhibited a pair of chromatographic peaks which were found to produce nearly identical mass spectra, suggesting the existence of the chromium chelate as two geometrical isomers.

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a Department of Chemistry, Faculty of Science, Mahasarakham University, Mahasarakham 44000, Thailand.
b Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand.

Received November 21, 1994