ABSTRACT

The present work deals with the investigation of the thermal properties of bimetallic volatile Cs-containing compounds of MI[YL4] type. The influence of ligand (MI = Cs, L = CF3COCHCOR, R = tBu ptac, CF3 hfac, Me tfac, Ph btfac) and alkali metal (L = ptac, MI = Na, K, Cs) on thermal properties of this type of complexes was investigated using thermogravimetry, differential scanning calorimetry and two independent methods of vapour pressure measurement, viz. flow (transpiration) and Knudsen s effusion. Thermal decomposition of Cs[Y(ptac)4] was studied in vacuum and in the presence of oxygen by means of in situ high-temperature mass spectrometry. The routes of vapour decomposition on a heated surface are proposed. Complex Cs[Y(ptac)4] was found to be perspective precursor for production of Cs-containing films by Metal Organic Chemical Vapour Deposition (MOCVD). The low-pressure MOCVD experiments have shown that films containing caesium oxide could be deposited using this precursor.

Compounds

#	Formula	Name
1	C32H40CsF12O8Y	cesium tetrakis(1,1,1-trifluoro-5,5-dimethyl-2,4-hexanedionato-O,O')yttrate(1-)
2	C32H40F12NaO8Y	sodium tetrakis(1,1,1-trifluoro-5,5-dimethyl-2,4-hexanedionato-O,O')yttrate(1-)
3	C32H40F12KO8Y	potassium tetrakis(1,1,1-trifluoro-5,5-dimethyl-2,4-hexanedionato-O,O')yttrate(1-)
4	C20H4CsF24O8Y	cesium tetrakis(1,1,1,5,5,5-hexafluoro-2,4-pentanedionato-O,O')yttrate(1-)
5	C20H16CsF12O8Y	cesium tetrakis(1,1,1-trifluoro-2,4-pentanedionato-O,O')yttrate(1-)
6	C40H24CsF12O8Y	cesium tetrakis(4,4,4-trifluoro-1-phenyl-1,3-butanedionato-O,O')yttrate(1-)

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Phase	Method	#Points
POMD	1	Normal melting temperature, K ; Crystal		Crystal Liquid Air at 1 atmosphere	DTA	1
POMD	1	Molar enthalpy of transition or fusion, kJ/mol ; Crystal		Crystal Liquid Air at 1 atmosphere	DSC	1
POMD	1	Vapor or sublimation pressure, kPa ; Crystal	Temperature, K; Crystal	Crystal Gas	Transpiration method	11
POMD	1	Vapor or sublimation pressure, kPa ; Crystal	Temperature, K; Crystal	Crystal Gas	Calculated from knudsen effusion weight loss	11
POMD	2	Vapor or sublimation pressure, kPa ; Crystal	Temperature, K; Crystal	Crystal Gas	Transpiration method	4
POMD	3	Vapor or sublimation pressure, kPa ; Crystal	Temperature, K; Crystal	Crystal Gas	Transpiration method	10
POMD	4	Triple point temperature, K ; Crystal 2		Crystal 2 Crystal 1 Air at 1 atmosphere	DTA	1
POMD	4	Normal melting temperature, K ; Crystal 1		Crystal 1 Liquid Air at 1 atmosphere	DTA	1
POMD	4	Molar enthalpy of transition or fusion, kJ/mol ; Crystal 2		Crystal 2 Crystal 1 Air at 1 atmosphere	DSC	1
POMD	4	Vapor or sublimation pressure, kPa ; Crystal 2	Temperature, K; Crystal 2	Crystal 2 Gas	Transpiration method	12
POMD	5	Triple point temperature, K ; Crystal 2		Crystal 2 Crystal 1 Air at 1 atmosphere	DTA	1
POMD	5	Normal melting temperature, K ; Crystal 1		Crystal 1 Liquid Air at 1 atmosphere	DTA	1
POMD	5	Molar enthalpy of transition or fusion, kJ/mol ; Crystal 2		Crystal 2 Crystal 1 Air at 1 atmosphere	DSC	1
POMD	5	Molar enthalpy of transition or fusion, kJ/mol ; Crystal 1		Crystal 1 Liquid Air at 1 atmosphere	DSC	1
POMD	5	Vapor or sublimation pressure, kPa ; Crystal 1	Temperature, K; Crystal 1	Crystal 1 Gas	Transpiration method	7
POMD	6	Normal melting temperature, K ; Crystal		Crystal Liquid Air at 1 atmosphere	DTA	1
POMD	6	Molar enthalpy of transition or fusion, kJ/mol ; Crystal		Crystal Liquid Air at 1 atmosphere	DSC	1
POMD	6	Vapor or sublimation pressure, kPa ; Crystal	Temperature, K; Crystal	Crystal Gas	Calculated from knudsen effusion weight loss	6
POMD	6	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	Calculated from knudsen effusion weight loss	4

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Volatile caesium-containing compounds of Cs[Y(.beta.-diketonato)4] type: Thermal behaviour in condensed and gas phases

Vikulova, E. S.[Evgeniia S.], Zherikova, K. V.[Kseniya V.], Zelenina, L. N.[Ludmila N.], Trubin, S. V.[Sergey V.], Sysoev, S. V.[Sergey V.], Semyannikov, P. P.[Pyotr P.], Asanov, I. P.[Igor P.], Morozova, N. B.[Natalia B.], Igumenov, I. K.[Igor K.]

ABSTRACT