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  • 2,2,6,6-tetramethyl-3,5-heptanedione  (1)
  • Thermochemistry  (1)
  • enthalpy of cavity formation  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Enthalpic determinations of aliphatic ester-solvent systems with correlations (1995)
    Springer
    Journal of solution chemistry 24 (1995), S. 39-50 
    Details
    ISSN: 1572-8927
    Keywords: enthalpy of solution ; enthalpy of cavity formation ; enthalpy of interaction ; aliphatic ester ; 1,2-dichloroethane ; n-hexane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Calorimetric measurements were carried out on ester-solvent systems where the esters were H(CH2)xCOO(CH2)yH, with x and y varying from 1 to 5, and the solvents were n-hexane and 1,2-dichloroethane. Calculation of the enthalpies of cavity formation enabled the enthalpies of interaction to be determined. Both enthalpies correlated with number of carbon atoms N, equal to x+y in the esters, giving for 1,2-dichloroethane $$\begin{gathered} \Delta _{cav} H_m^O = 29.4 \pm 2.3 + 4.7 \pm 0.4N \hfill \\ \Delta _{int} H_m^O = - 53.9 \pm 2.5 - 8.2 \pm 0.5N \hfill \\ \end{gathered} $$ and for n-hexane $$\begin{gathered} \Delta _{cav} H_m^O = 8.8 \pm 1.1 + 3.4 \pm 0.2N \hfill \\ \Delta _{int} H_m^O = - 20.0 \pm 2.1 - 8.3 \pm 0.4N \hfill \\ \end{gathered} $$ From these linear correlations enthalpies of an aliphatic ester, for example, the enthalpy of vaporization can be calculated by using a thermochemical cycle. The presence of chloro atoms in the aliphatic solvent causes a large interactive effect between the ester and 1,2-dichloroethane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00973048
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  • 2
    Electronic Resource
    Electronic Resource
    The mean enthalpy of the lanthanide-oxygen bond in 2,2,6,6-tetramethyl-3,5-heptanedione chelates of praseodimium and holmium (1993)
    Springer
    Structural chemistry 4 (1993), S. 323-325 
    Details
    ISSN: 1572-9001
    Keywords: Thermochemistry ; 2,2,6,6-tetramethyl-3,5-heptanedione ; mean enthalpy ; β-diketonates ; lanthanide elements ; lanthanide-oxygen bond
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The general thermochemical reaction LnCl3·6H2O(c)+3Hthd(1)+73.92H2O(1) = Ln(thd)3(c) +3HCl·26.64H2O(aq); ΔrHm (Ln = Pr, Ho and thd = 2,2,6,6-tetramethyl-3,5-heptanedionate) was employed to determine through solution-reaction calorimetry at 298.15 K the standard molar enthalpies of formation of crystalline chelates, −2434.3±11.5 (Pr) and −2384.8±11.5 (Ho) kJ mol−1. These values and the corresponding molar enthalpies of sublimation enabled the determination of the standard molar enthalpies of chelates in the gaseous phase. From these values the mean enthalpies of the lanthanide-oxygen bond, 265±10 (Pr) and 253±10 (Ho) kJ mol−1 were calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00681206
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