Mass spectrometric study of superheated vapors of lanthanide tris(hexafluoroacetylacetonates) |
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| Authors: | G V Girichev N V Tverdova N P Kuz’mina I G Zaitseva V V Rybkin |
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| Institution: | (1) Ivanovo State University of Chemistry and Technology, pr. Engel’sa 7, Ivanovo, 153000, Russia;(2) Moscow State University, Vorob’evy gory, Moscow, 119992, Russia |
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| Abstract: | Superheated vapors of La(hfa)3, Nd(hfa)3, Sm(hfa)3, Gd(hfa)3, Dy(hfa)3, Ho(hfa)3, Yb(hfa)3, and Lu(hfa)3 have been studied by mass spectrometry using a double two-temperature effusion cell in order to identify the molecular species present in the vapor at different degrees of superheating and the temperature of complete decomposition of the complexes. For equal temperatures of the upper and low compartments of the cell and for moderate superheating, the vapors of the listed complexes are highly oligomerized (mono-, di-, and trimers were detected). Vapor superheating shows low thermal stability of oligomers, whose stability decreases along the series La-Lu. The metal nature is shown to have an effect on the volatility and the fragmentation pattern of the chelates. The conditions of existence of monomeric complexes are identified. |
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