Abstract The compounds 1, 1, 1-trichloro-2, 4-pentanedione, Cu (II) tca 2, Co (II) tca 2, Mn (II) tca 2, Al (III) tca 3, Cr (III) tca 3 and Fe (III) tca 3 (tca [TRIPLE BOND] 1, 1, 1-trichloro-2, 4- pentanedionato,[CCl 3 COCHCOCH 3]−) have been prepared and their mass spectra have been obtained. The mass spectral results have been compared with findings for comparable fluorinated and nonhalogenated compounds. Comparisons are made in terms of internal ...