Mass spectrometric study of the thermodynamic properties of mixed-ligand Mn(III) complexes

• Published in: Inorganic materials Vol. 47; no. 3; pp. 324 - 328
• Main Authors: Kamkin, N. N., Dement’ev, A. I., Yaryshev, N. G., Alikhanian, A. S., Kharchenko, A. V.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01.03.2011
• Subjects: Chemistry; Chemistry and Materials Science; Enthalpy; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Inorganic materials; Mass spectrometry; Materials Science; Mathematical analysis; Spectroscopy; Sublimation; Thermodynamic properties; Vapor phases; Mass Spectrometric Study; Standard Enthalpy; Acac; Mixed Ligand Complex; Bond Dissociation Enthalpy
• ISSN: 0020-1685; 1608-3172
• DOI: 10.1134/S0020168511030125

We have synthesized Mn(thd) 3 (thd = dipivaloylmethane, or 2,2,6,6-tetramethyl-3,5-heptanedione) and evaluated its enthalpy of sublimation (89.0 ± 7.0 kJ/mol) and its saturated vapor pressure as a function of temperature from mass spectrometry data. Exchange reactions between Mn(acac) 3 (acac = acetylacetonate, or 2,4-pentanedione) and Mn(thd) 3 have been performed using an in situ technique. We have calculated the enthalpies of the exchange reactions and the enthalpies of formation of Mn(acac) 2 (thd) and Mn(acac)(thd) 2 in the vapor phase: −1417.5 ± 15.0 and −1590.6 ± 15.0 kJ/mol, respectively.