Ystalline phase. Thus, the first transition within the cooling cycle immediately after heating all all salts is identified because the clearing (T ) from within the cooling cycle after heating forfor salts is identified as the clearing point point (Tc) c in the isotropic melt in to the mesophase and also the subsequent transition melting point the isotropic melt into the mesophase plus the subsequent transition as the as the melting point (Tm clearing and and melting points are summarized in Table 1. Olesoxime Mitochondrial Metabolism Primarily based on data, an (Tm ). The). The clearingmelting points are summarized in Table 1. Primarily based on thisthis information, a rise ofclearing pointspoints (the initial transition) inside eachthe 3-pyridinium enhance with the the clearing (the initial transition) within every single series of series with the 3pyridinium salts 5-pyridinium derivatives (2d-f) is observed. Thus, rising clearing salts (1d-f) plus the (1d-f) along with the 5-pyridinium derivatives (2d-f) is observed. Therefore, rising growing chain with are observed and could are observed appealing van points with clearing points Polmacoxib inhibitor lengthincreasing chain length be explained by and could be explained by eye-catching van der between the hydrocarbon chains contributing to the der Waals forces plus the interactions Waals forces and the interactions in between the hydrocarbon chains contributing for the regional structure and hence, inducing neighborhood structure and thus, inducing micro-segregation among hydrophobic alkyl chains micro-segregation amongst hydrophobic alkyl chains and charged ionic regions [22]. and charged ionic regions [22]. Besides this trend, by comparing the regioisomers with In addition to this trend, by comparing the regioisomers with each other when are very related. each other when bearing the exact same alkyl chain length, the clearing points bearing the exact same alkyl chain length, the clearing points are rather similar. Only the the 1f and points (the Only the salts 1f and 2f differ in order of 14 C. On the other hand,saltsmelting 2f differ in order of 14 . However, the melting points (the for 2d) transitions) are fairly second transitions) are really equivalent within the series (except second but differ based similar within the series in the perfluoroheptyl chain as well as the pyridinium moieties around the of the reciprocal position (except for 2d) but differ based from the reciprocal position on the perfluoroheptyl chain and fact, the 3-pyridinium salts (1d-f) possess greater melting interspacing oxadiazole ring. Inside the pyridinium moieties around the interspacing oxadiazole ring. than the corresponding 5-pyridinium derivatives. pointsIn truth, the 3-pyridinium salts (1d-f) possess higher melting points than the The following discussion about the liquid crystalline phase behavior will concentrate corresponding 5-pyridinium derivatives. only on the transitions upon cooling. For this, the temperature of each transition, the corresponding enthalpy values and also the recommended phase transitions are summarized in Table two. Because the modify in structural ordering of the phase is proportional for the magnitude of the enthalpy change, the enthalpies in Table 2 can be compared with literature values to establish the type of phase. The enthalpy for the melting transition from a crystalline solid-state to a liquid crystalline phase (Cr – LC) or an isotropic liquid (Cr – I) phase is 30 to 50 kJ mol-1 , whereas the enthalpy for any liquid crystalline phase to a liquid crystallineAppl. Sci. 2021, 11,8 ofphase (LC – LC) along with a liquid crystalline phase to an.