Partial Molar Volumes of N,N′-1,2-Ethyl-bis(salicyladimine) Schiff Base (Salen) in Organic Solvents at T = (283.15 to 318.15) K

Abstract

Densities of N, N′-1,2-ethyl-bis(salicyladimine) Schiff base (salen) in dimethylsulfoxide (DMSO), N,Ndimethylformamide (DMF), N,N-dimethylacetamide (DMA), dichloromethane (CH 2 Cl 2 ), and chloroform (CHCl 3 ) binary mixtures have been measured in dilute concentration regions of salen at T ) (283.15 to 318.15) K under ambient pressure. Apparent molar volumes, V φ , and standard partial molar volumes, V φ 0 , have been calculated from the measured densities. The V φ 0 values in DMSO have larger values corresponding to the high polarity of this solvent. The results show that their values would be increased slightly with an increase in temperature. The partial molar expansivities, E φ 0 , and the isobaric thermal expansion coefficients, R*, have been calculated from the temperature dependence of V φ 0 values. The Hepler's constant values, (∂ 2 V φ 0 /∂T 2 ) p , were found to be positive or very small and negative which indicate that salen Schiff base is predominately a structure maker in all organic solvents studied.

Effect of ionic liquid on the solvation behavior of nonaqueous N,N′-salicylidenephenylediamine Schiff base (Salophen) solutions at 298.15K

“…The values of V 0 / and S v for Salophen are given in table 4. The calculated V 0 / values of Salophen are in agreement with those of Salen Schiff base obtained in our previous paper, the V 0 / values of Salophen Schiff base are greater than their values for salen Schiff base due to the higher intrinsic volume of Salophen [26]. The values of V 0 / for Salophen in the investigated solutions have the order: DMA < DMSO as shown in figure 2.…”

“…c m IL shows the molality of ionic liquid in organic solvents. [26]. concentration of the ionic liquid.…”

Volumetric and Viscometric Studies of N,N′-Bis(salicylaldehyde)-1,3-diaminopropane Schiff Base (Salpr) in Ionic Liquid + DMF solutions

“…The V 0 φ value of Salpr is also greater that of the salen Schiff base due to its higher intrinsic volume [24]. The structure of Salpr is shown in Fig.…”

Thermophysical study of the binary mixtures of N , N -dimethylacetamide with 1-propanol and 1-butanol

“…The experimental density, speed of sound, refractive index and kinematic viscosity values, of the pure components at work temperatures and at p =0.1 MPa are collected in Table 2 along with isobaric expansibility values, calculated from our density measurements, and molar heat capacity values taken from literature [12][13]. For comparison, some values found in the literature [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] are also included in this Table.…”

“…Another density measurements and calculated excess molar volumes were given only at T = 298. 15 K by two authors [4,5], and finally the refractive indices and their deviations at T = 298. 15 K [5] were reported too.…”