ABSTRACT

Liquid-crystalline properties of the homologous series of 4-octyloxybenzylidene-4 -alkyloxyaniline are described. Based on the polarization microscopy (POM and TOA methods) and the calorimetric (DSC) measurements a rich polymorphism was detected. Investigated compounds exhibit nematic, smectic C, smectic I and smectic G mesophases with their characteristic configurations. The presence of all mesophaseswas confirmed by the miscibilitymethod, using 4-heptyloxybenzilidene-4 -pentylaniline (I), 4-octyl-4 -decyloxyazobenzene (II) and 4-octyl-4 -undecyloxyazobenzene (III) as the mesophase standards. The influence of an alkyl chain length on the mesophase sequence and the entropic effects are extensively discussed.

Compounds

#	Formula	Name
1	C22H29NO2	4-octyloxybenzylidene-4'-methyloxyaniline
2	C23H31NO2	4-ethoxy-N-[[4-(octyloxy)phenyl]methylene]benzenamine
3	C24H33NO2	4-octyloxybenzylidene-4'-propyloxyaniline
4	C25H35NO2	benzenamine, 4-butoxy-N-[[4-(octyloxy)phenyl]methylene]-
5	C26H37NO2	4-octyloxybenzylidene-4'-pentyloxyaniline
6	C27H39NO2	4-octyloxybenzylidene-4'-hexyloxyaniline
7	C28H41NO2	4-octyloxybenzylidene-4'-heptyloxyaniline
8	C29H43NO2	4-octyloxybenzylidene-4'-octyloxyaniline
9	C30H45NO2	4-octyloxybenzylidene-4'-nonyloxyaniline
10	C31H47NO2	4-octyloxybenzylidene-4'-decyloxyaniline
11	C33H51NO2	4-octyloxybenzylidene-4'-dodecyloxyaniline

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	Phase	Method	#Points
POMD	1	Triple point 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	2	Triple point temperature, K ; Crystal	Crystal Nematic liquid crystal Air at 1 atmosphere	DTA	1
POMD	2	Triple point temperature, K ; Nematic liquid crystal	Nematic liquid crystal Liquid Air at 1 atmosphere	DTA	1
POMD	2	Molar enthalpy of transition or fusion, kJ/mol ; Crystal	Crystal Nematic liquid crystal Air at 1 atmosphere	DSC	1
POMD	2	Molar enthalpy of transition or fusion, kJ/mol ; Nematic liquid crystal	Nematic liquid crystal Liquid Air at 1 atmosphere	DSC	1
POMD	3	Triple point temperature, K ; Crystal	Crystal Nematic liquid crystal Air at 1 atmosphere	DTA	1
POMD	3	Triple point temperature, K ; Nematic liquid crystal	Nematic liquid crystal Liquid Air at 1 atmosphere	DTA	1
POMD	3	Molar enthalpy of transition or fusion, kJ/mol ; Crystal	Crystal Nematic liquid crystal Air at 1 atmosphere	DSC	1
POMD	3	Molar enthalpy of transition or fusion, kJ/mol ; Nematic liquid crystal	Nematic liquid crystal Liquid Air at 1 atmosphere	DSC	1
POMD	4	Triple point temperature, K ; Crystal	Crystal Nematic liquid crystal Air at 1 atmosphere	DTA	1
POMD	4	Triple point temperature, K ; Nematic liquid crystal	Nematic liquid crystal Liquid Air at 1 atmosphere	DTA	1
POMD	4	Molar enthalpy of transition or fusion, kJ/mol ; Crystal	Crystal Nematic liquid crystal Air at 1 atmosphere	DSC	1
POMD	4	Molar enthalpy of transition or fusion, kJ/mol ; Nematic liquid crystal	Nematic liquid crystal Liquid Air at 1 atmosphere	DSC	1
POMD	5	Triple point temperature, K ; Crystal	Crystal Smectic liquid crystal Air at 1 atmosphere	DTA	1
POMD	5	Triple point temperature, K ; Smectic liquid crystal	Smectic liquid crystal Nematic liquid crystal Air at 1 atmosphere	DTA	1
POMD	5	Triple point temperature, K ; Nematic liquid crystal	Nematic liquid crystal Liquid Air at 1 atmosphere	DTA	1
POMD	5	Molar enthalpy of transition or fusion, kJ/mol ; Crystal	Crystal Smectic liquid crystal Air at 1 atmosphere	DSC	1
POMD	5	Molar enthalpy of transition or fusion, kJ/mol ; Smectic liquid crystal	Smectic liquid crystal Nematic liquid crystal Air at 1 atmosphere	DSC	1
POMD	5	Molar enthalpy of transition or fusion, kJ/mol ; Nematic liquid crystal	Nematic liquid crystal Liquid Air at 1 atmosphere	DSC	1
POMD	6	Triple point temperature, K ; Crystal	Crystal Smectic liquid crystal Air at 1 atmosphere	DTA	1
POMD	6	Triple point temperature, K ; Smectic liquid crystal	Smectic liquid crystal Nematic liquid crystal Air at 1 atmosphere	DTA	1
POMD	6	Triple point temperature, K ; Nematic liquid crystal	Nematic liquid crystal Liquid Air at 1 atmosphere	DTA	1
POMD	6	Molar enthalpy of transition or fusion, kJ/mol ; Crystal	Crystal Smectic liquid crystal Air at 1 atmosphere	DSC	1
POMD	6	Molar enthalpy of transition or fusion, kJ/mol ; Smectic liquid crystal	Smectic liquid crystal Nematic liquid crystal Air at 1 atmosphere	DSC	1
POMD	6	Molar enthalpy of transition or fusion, kJ/mol ; Nematic liquid crystal	Nematic liquid crystal Liquid Air at 1 atmosphere	DSC	1
POMD	7	Triple point temperature, K ; Crystal	Crystal Smectic liquid crystal Air at 1 atmosphere	DTA	1
POMD	7	Triple point temperature, K ; Smectic liquid crystal	Smectic liquid crystal Nematic liquid crystal Air at 1 atmosphere	DTA	1
POMD	7	Triple point temperature, K ; Nematic liquid crystal	Nematic liquid crystal Liquid Air at 1 atmosphere	DTA	1
POMD	7	Molar enthalpy of transition or fusion, kJ/mol ; Crystal	Crystal Smectic liquid crystal Air at 1 atmosphere	DSC	1
POMD	7	Molar enthalpy of transition or fusion, kJ/mol ; Smectic liquid crystal	Smectic liquid crystal Nematic liquid crystal Air at 1 atmosphere	DSC	1
POMD	7	Molar enthalpy of transition or fusion, kJ/mol ; Nematic liquid crystal	Nematic liquid crystal Liquid Air at 1 atmosphere	DSC	1
POMD	8	Triple point temperature, K ; Crystal	Crystal Smectic liquid crystal Air at 1 atmosphere	DTA	1
POMD	8	Triple point temperature, K ; Smectic liquid crystal	Smectic liquid crystal Nematic liquid crystal Air at 1 atmosphere	DTA	1
POMD	8	Triple point temperature, K ; Nematic liquid crystal	Nematic liquid crystal Liquid Air at 1 atmosphere	DTA	1
POMD	8	Molar enthalpy of transition or fusion, kJ/mol ; Crystal	Crystal Smectic liquid crystal Air at 1 atmosphere	DSC	1
POMD	8	Molar enthalpy of transition or fusion, kJ/mol ; Smectic liquid crystal	Smectic liquid crystal Nematic liquid crystal Air at 1 atmosphere	DSC	1
POMD	8	Molar enthalpy of transition or fusion, kJ/mol ; Nematic liquid crystal	Nematic liquid crystal Liquid Air at 1 atmosphere	DSC	1
POMD	9	Triple point temperature, K ; Crystal	Crystal Smectic liquid crystal Air at 1 atmosphere	DTA	1
POMD	9	Triple point temperature, K ; Smectic liquid crystal	Smectic liquid crystal Nematic liquid crystal Air at 1 atmosphere	DTA	1
POMD	9	Triple point temperature, K ; Nematic liquid crystal	Nematic liquid crystal Liquid Air at 1 atmosphere	DTA	1
POMD	9	Molar enthalpy of transition or fusion, kJ/mol ; Crystal	Crystal Smectic liquid crystal Air at 1 atmosphere	DSC	1
POMD	9	Molar enthalpy of transition or fusion, kJ/mol ; Smectic liquid crystal	Smectic liquid crystal Nematic liquid crystal Air at 1 atmosphere	DSC	1
POMD	9	Molar enthalpy of transition or fusion, kJ/mol ; Nematic liquid crystal	Nematic liquid crystal Liquid Air at 1 atmosphere	DSC	1
POMD	10	Triple point temperature, K ; Crystal	Crystal Smectic liquid crystal Air at 1 atmosphere	DTA	1
POMD	10	Triple point temperature, K ; Smectic liquid crystal	Smectic liquid crystal Nematic liquid crystal Air at 1 atmosphere	DTA	1
POMD	10	Triple point temperature, K ; Nematic liquid crystal	Nematic liquid crystal Liquid Air at 1 atmosphere	DTA	1
POMD	10	Molar enthalpy of transition or fusion, kJ/mol ; Crystal	Crystal Smectic liquid crystal Air at 1 atmosphere	DSC	1
POMD	10	Molar enthalpy of transition or fusion, kJ/mol ; Smectic liquid crystal	Smectic liquid crystal Liquid Air at 1 atmosphere	DSC	1
POMD	11	Triple point temperature, K ; Crystal	Crystal Smectic liquid crystal Air at 1 atmosphere	DTA	1
POMD	11	Triple point temperature, K ; Smectic liquid crystal	Smectic liquid crystal Nematic liquid crystal Air at 1 atmosphere	DTA	1
POMD	11	Molar enthalpy of transition or fusion, kJ/mol ; Crystal	Crystal Smectic liquid crystal Air at 1 atmosphere	DSC	1
POMD	11	Molar enthalpy of transition or fusion, kJ/mol ; Smectic liquid crystal	Smectic liquid crystal Nematic liquid crystal Air at 1 atmosphere	DSC	1

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Liquid-crystalline properties of 4-octyloxybenzylidene-4?-alkyloxyaniline and their mixtures with 4-pentyloxybenzylidene-4?-heptylaniline

Godzwon, J.[Joanna], Sienkowska, M. J.[Monika J.], Galewski, Z.[Zbigniew]

ABSTRACT