Dielectric behavior of some mesogenic-, non-mesogenic- and organic molecules

Vasan, S.T.; Sannaninganavar, F.M.; Ayachit, N. H.; Deshpande, D. K.

doi:10.1016/j.molliq.2006.10.001

Cited by 10 publications

(6 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…But the observed values do not support this point and indicate that this method gives physically meaningless results. But, the ground state dipole moment values for these molecules determined by an independent method (modified Guggenheim) reported elsewhere [2] do not seem to contradict these values if not supporting them. Thus, it may be said that the single concentration -twofrequency method can serve as giving some qualitative trends.…”

Section: Resultsmentioning

confidence: 56%

“…The dielectric studies on aromatic molecules have been reported from our laboratory earlier [1][2][3][4][5][6][7][8] and others , as dielectric approach forms one of the powerful tools for the determination of molecular structure [9]. For example, in the case of some derivatives of sydnones rather high values of electric dipole moments could be explained in a satisfactory way by assigning cyclic meso-ionic structures rather than an improbable bicyclic structure.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dielectric studies on some mesogenic, non-mesogenic and organic molecules

Sannaninganavar¹,

Ayachit

Deshpande

2009

Physics and Chemistry of Liquids

Self Cite

View full text Add to dashboard Cite

Two important molecular parameters, namely, the dielectric relaxation time and electric dipole moment are highly useful in having insight into the molecular structure, size, shape, apart from the inter-and intra-molecular forces, etc. With these in view dielectric measurements in benzene at room temperature on the pure samples of o-ethyl phenol, 2-n-butylphenol, 4-n-butylphenol, 2,6-dimethoxyphenol and 3,4-difluorophenol were carried out at a frequency of 9.98 GHz by employing concentration variation method. Similar measurements, on a single weight fraction of each of them at 9.98 GHz and also at 8.74 GHz are carried out. Measurements on a single weight fraction in benzene of each of the liquid crystal samples, namely, EPCP.car (Butyl-p-(p-ethoxy phenoxy corbonyl)-phenyl carbonate), PPPB (p-pentylphenyl-p-propyl benzonate), EPAP.Hp (p-(p-ethoxyphenyl azo) phenyl heptenate) and EPAP. Und (p-(p-ethoxyphenyl azo) phenyl undecylenate were also carried out at the said two frequencies. Using the obtained values of " 0 , " 00 relaxation time and dipole moment were determined using different methods. The obtained results are compared with earlier results wherever available.

show abstract

Section: Resultsmentioning

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Dielectric studies on some mesogenic, non-mesogenic and organic molecules

Sannaninganavar¹,

Ayachit

Deshpande

2009

Physics and Chemistry of Liquids

Self Cite

View full text Add to dashboard Cite

show abstract

“…These values, namely, a D , a ve , a SR and a M respectively are given in table 1 for each molecule along with the high frequency limiting rigidity modulus G 1 . The values for p-bromonitrobenzene and m-bromonitrobenzene are presented from the earlier works of the author [5].…”

Section: Resultsmentioning

confidence: 99%

“…The work on aromatic molecules in general, and liquid crystal samples in particular is being carried out by the authors and others from this laboratory [1][2][3][4][5][6][7][8]. This paper aims to build upon these studies.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Viscoelastic studies of some phenols from dielectric measurements

Ayachit

Sannaninganavar²,

Deshpande

2007

Physics and Chemistry of Liquids

View full text Add to dashboard Cite

The variation of dielectric relaxation time with the viscosity of the medium is being exploited in drawing certain quantitative conclusions regarding molecular motion and intermolecular forces in liquids, liquid mixtures, dilute solutions and multi-component polar solutes in dilute solution. With no perfect empirical or theoretical equation in place for the variation of dielectric relaxation time with viscosity, the experimental investigations on different systems only can give an insight. In the present study the results of dielectric measurements carried out on pure samples of o-ethyl phenol, 2-n-butylphenol, 4-n-butylphenol, and 2,6-butylphenol in dilute solutions in different mixed solvents (benzene þ paraffin) and on binary mixtures (1 : 1) of p-2-n-butylphenol þ 4-nbutylphenol and p-bromonitrobenzene þ 2,6-butylphenol, are reported. For comparison, the results on p-bromonitrobenzene þ m-bromonitrobenzene as an example of mixture of nonassociative liquids was also carried out and the results are presented. Different parameters determined using these dielectric measurements are also presented using different models and these studies indicate that the dielectric behavior at microwave frequencies favor the concept of dynamic viscosity and a single viscoelastic relaxation time for the system under study.

show abstract