The reactivity of metal β-diketonates in the thermal decomposition reaction

Standard molar enthalpies of formation of eight lanthanide(III) 2,2,6,6-tetramethyl-3, 5-heptanedione chelates in the crystalline and gaseous states: mean Ln–O bond dissociation enthalpies

“…The standard molar enthalpies of formation of complexes in the gaseous state f H o m of lanthanide(III) dipivaloylmethanates 829 were calculated using the literature values of the standard molar enthalpies of sublimation of chelates determined by a Bourdon spoon gauge method (17) and the results are presented in table 6. The other available values of the standard molar enthalpies of sublimation (16) in kJ · mol −1 are for: La(DPM) 3 , (107.9 ± 4.6); Pr(DPM) 3 , (104.3 ± 2.6); Nd(DPM) 3 , (92.9 ± 2.5); Gd(DPM) 3 , (78.8 ± 1.5). These values not only differ considerably from those of Sicre's et al (17) but also vary in the opposite direction.…”

“…Over the last three decades the thermochemistry of both β-diketones and metal-β-diketonates has been progressively and extensively investigated. (12)(13)(14)(15)(16) This work deals with thermochemical data of the chelate formation between the bidentate ligand dipivaloylmethane (2,2,6,6-tetramethyl-3,5-heptanedione, HDPM), and lanthanide cations (Ln). Chelates of this type, Ln(DPM) 3 , are easily prepared from solution and purified by sublimation techniques.…”

Surface Modification of Detonation Nanodiamonds with Platinum and Palladium Nanoparticles

“…In the absence of DND, the platinum and palladium acetylacetonates, being volatile (Vargas Garcia & Takashi Goto, 2003;Morozova et al, 2001), are completely sublimated within the temperature range where the spontaneous ignition of their mixtures with DND occurs, while Na(acac) does not undergo substantial changes. The average ignition temperature of the DND mixtures with М(асас) n is lower than the temperature of their own pyrolysis of the metal salts (Tsiganova & Dyagileva, 1996), indicating the catalytic character of the reaction. In this case, the mechanism of DND catalytic action is most likely because of their ability to adsorb oxygen on the surface.…”

“…According to (Tsiganova & Dyagileva, 1996). Reactivity of β-diketonates in the reaction of thermal decomposition in the case of metal acetylacetonates thermal decomposition in a vacuum into the gas phase either thermally stable Hacac or acac-radical is released.…”

Thermochemical studies of 2,2,6,6-tetramethyl-3,5-heptanedione chelates of scandium group elements

“…(4)(5)(6) On the other hand, the volatility, thermal stability, and resistance to oxidation of the metal in this class of chelates are fundamental factors related to their use in the technology of films. (7) In a To whom correspondence should be addressed.…”