Beta-diketonates, fluorinated

The major breakthrough that transformed metal chelate GC into a useful analytical technique was the introduction of fluorinated beta-diketone ligands, which formed complexes of greater volatility and thermal stability. Trifluoroacetylacetone (l,l,l-trifluoro-2,4-pentanedione—HTFA) and hexafluoro-acetylacetone (l,l,l,5,5,5-hexafluoro-2,4,-pentanedione—HHFA) are the fluorinated ligands most frequently employed. HTFA extended the range of metals that may be gas chromatographed with little or no evidence of decomposition to include Ga3+, In3+, Sc3+, Rh3+ and V4+. An example of a recent application is the analysis for beryllium in ambient air particulates. After filter sampling and extraction/chelation, packed column GC with electron capture detection allowed ppm level beryllium quantitation in collected particulates which corresponded to levels of 2-20 x 10 5 pg/m3 in the sampled air. 

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Martin-Ramos P, Silva MR, Coya C, Zaldo C, Alvarez AL, Alvarez-Garcia S, Matos Beja AM, Martin-Gil J (2013) Novel erbium(iii) fluorinated [small beta]-diketonate complexes with N, N-donors for optoelectronics from synthesis to solution-processed devices. J Mater Chem C 1 (15) 2725-2734... 

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