against of Fig. 2 for

different wjk’s are made by utilizing fitting procedure upon the

experimental data. It is observed that in the lower concentration region graphs

are slightly deviated from linearity expecting accurate measurement of

experimental data. From Fig. 3 and 4, ratio of slopes of – wjk and – wjk curves are used respectively to

calculate t . Highly convex nature of parabolic graphs of and against wjk’s

are indicating maximum absorption of electric

energy contributing to highest polarization. The nonlinear behavior of’s with wjk in a binary mixture is an

indication of the occurrence of microscopic inhomogeneity in them. Due to

uniqueness of the method, all the graphs of Fig. 3 and 4 are based fitted

through the experimental data. From Fig. 5,t ‘s are also estimated using slope of – linear

equation. It is observed that in Fig. 5, straight lines

are not exactly linear with experimental data revealing the fact that ratio of

slope method eliminates polar-polar interaction compare to linear slope method

for the systems under observation. The estimated and are compared

with the most probable and

measured t ‘s from ratio of slope and linear slope. ‘s of all systems agree well with t from ratio of slopes and Higasi’s method 9. This signifies double

relaxation phenomenon produces macroscopic as well as microscopic relaxation times

for all the systems showing their molecular non-rigidity under microwave field.

The influence of microscopic

inhomogeneity arising from bonding of proton donor (amine) and proton

acceptor (acetonitrile) plays a significant role in predicting double relaxation

behavior. It is evident from TABLE I that relaxation time ? increases with

increasing acidity of proton donor (amine) in complex systems. But in nitriles

with N, N-dimethyl amine systems, the ? values are less than the other amine

complexes due to steric hindrance and inductive effect. . ‘s agree with the measured and reported’s. This indicates the existence of symmetric (Cole –

Cole) distribution of relaxation behavior rather than asymmetric (Cole –

Davidson) distribution in liquid mixture. The values of symmetric distribution

parameter’s are very small in comparison to

the asymmetric distribution parameter’s as shown in TABLE II validating the symmetric

distribution of relaxation behavior in them.The addition of theoretical c1

& c2 and experimental c1

& c2 for all systems are 1 and greater than 1 respectively as

shown in TABLE II validating the existence of more than two Debye type

dispersions in liquid mixture.. The graphical plot reveals that the and curves of Fig.

6 are all parabola in nature exhibiting a minimum at a certain wjk’s

of solutes. Like curve, curves are also

concave in nature with the increase of wjk which is consistent with

the earlier observation 6. This signifies the possible formation of

solute-solute (dimer) or solute-solvent (monomer) molecular association in the

higher concentration region.

Fig. 2. The variations of against for different wjk’s of amine and

acetonitrile mixture in benzene at 30°C under microwave

field. (I)¾¾ (II)¾·¾ (III)¾¾ for N-methyl aniline, aniline,

N, N-dimethyl aniline mixed with acetonitrile respectively.

Fig. 3. The variations of against wjk’s of amine and

acetonitrile mixture in benzene at 30°C under microwave field. (I)¾¾ (II)¾·¾ (III)¾¾ for N-methyl aniline, aniline, N, N-dimethyl aniline

mixed with acetonitrile respectively.