ABSTRACT

The thermodynamic stability of complexes formed between N, N {dimethylaniline (DMANI) and three ketones, namely, acetophenone (ACP), 4 {chloroactophenone (ClACP) and 4 {methylacetophenone (MACP) in n {hexane is extensively investigated by spectral and ultrasonic methods. The ultrasound scan was carried out in the temperature range 208.15 {313.15 K and at atmospheric pressure on solutions containing equimolar concentrations of components ranging from 0.025 to 0.2 M. The existence of solute !V solute interactions has also been confirmed through electronic absorption spectra analyzed with Benesi {Hildebrand theory at 303.15 K. The stability constants of the donor acceptor complexes determined both by spectroscopic and ultrasonic methods are comparable and follow similar trend. The trend in the formation constants is discussed with structures of the components. The thermodynamic behaviour of the systems was explained through the computed values of the free energy ( 'G), enthalpy ( 'H) and entropy ( 'S) changes for complex formation are computed and discussed. Keywords: thermodynamic properties, CT complexes, N, N-dimethylaniline, aryl ketones, ultrasonic, spectral methods

Compounds

#	Formula	Name
1	C8H11N	N,N-dimethylaniline
2	C8H8O	acetophenone
3	C8H7ClO	4'-chloroacetophenone
4	C9H10O	4'-methylacetophenone
5	C6H14	hexane

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	Constraint	Phase	Method	#Points
POMD	2 5 1	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid Amount concentration (molarity), mol/dm3 - 2; Liquid Amount concentration (molarity), mol/dm3 - 1; Liquid	Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	32
POMD	2 5 1	Speed of sound, m/s ; Liquid	Temperature, K; Liquid Amount concentration (molarity), mol/dm3 - 1; Liquid Amount concentration (molarity), mol/dm3 - 2; Liquid	Pressure, kPa; Liquid	Liquid	Linear variable-path acoustic interferometer	32
POMD	2 5 1	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Amount concentration (molarity), mol/dm3 - 2; Liquid Amount concentration (molarity), mol/dm3 - 1; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	32
POMD	3 5 1	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid Amount concentration (molarity), mol/dm3 - 3; Liquid Amount concentration (molarity), mol/dm3 - 1; Liquid	Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	32
POMD	3 5 1	Speed of sound, m/s ; Liquid	Temperature, K; Liquid Amount concentration (molarity), mol/dm3 - 1; Liquid Amount concentration (molarity), mol/dm3 - 3; Liquid	Pressure, kPa; Liquid	Liquid	Linear variable-path acoustic interferometer	32
POMD	3 5 1	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Amount concentration (molarity), mol/dm3 - 3; Liquid Amount concentration (molarity), mol/dm3 - 1; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	32
POMD	5 1 4	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid Amount concentration (molarity), mol/dm3 - 4; Liquid Amount concentration (molarity), mol/dm3 - 1; Liquid	Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	32
POMD	5 1 4	Speed of sound, m/s ; Liquid	Temperature, K; Liquid Amount concentration (molarity), mol/dm3 - 1; Liquid Amount concentration (molarity), mol/dm3 - 4; Liquid	Pressure, kPa; Liquid	Liquid	Linear variable-path acoustic interferometer	32
POMD	5 1 4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Amount concentration (molarity), mol/dm3 - 4; Liquid Amount concentration (molarity), mol/dm3 - 1; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	32

Thermodynamics Research Center / ThermoML | Thermochimica Acta

THERMODYNAMIC PROPERTIES OF DONOR ACCEPTOR COMPLEXES OF TERTIARY AMINE WITH ARYL KETONES IN HEXANE MEDIUM

Kumar, R., Jayakumar, S., Kannappan, V.

ABSTRACT