Abstract
New lithium complexes with fluorinated and non-fluorinated methoxy-substituted β-diketonates LF = 1,1,1-trifluoro-5-methoxy-5-methyl-hexane-2,4-dionato, L = 2-methoxy-2,6,6-trimethyl-heptane-3,5-dionato were prepared. X-ray analysis indicates the crystal structure of these complexes is molecular built of cyclic tetramers [LiL]4 and [LiLF]4. Li atoms are bonded to four oxygens in a tetrahedral environment. Methoxy groups of the ligands are involved in the coordination. The crystallographic data for [LiL]4: C44H76Li4O12, P21/n, a = 14.2759(9) Å, b = 11.9116(7) Å, c = 17.5870(11) Å, β = 90.948(2)°, Z = 4, d = 1.101 g/cm3; for [LiLF]4: C32H40F12Li4O12, P2/n, a = 9.5710(5) Å, b = 10.9946(17) Å, c = 18.8476(10) Å, β = 103.2212(10)°, Z = 2, d = 1.385 g/cm3. Thermal properties were investigated with TG-DTA, sublimation test. It was established that the complexes are volatile and sublime upon heating in a vacuum (170 °C, ∼10–2 Torr). As it was established by mass spectrometric technique, the tetrameric structure is retained in the gas phase under vaporization of the complexes.
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