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Intermolecular Interaction of Methyl Formate with 1-butanol,  1-Pentanol and 1-Hexanol at 303K

Sampandam Elangovan* and Dereje Wakgari Amente

Department of Physics, Wollega University, Nekemte-395, Ethiopia

 

Corresponding author Email: elangovan.physics@rediffmail.com

DOI : http://dx.doi.org/10.13005/msri/140220

ABSTRACT:

Intermolecular interaction among methyl formate with selected primary alcohols studied using Time Domain reflectometry at 303K. Dielectric constants, dielectric loss, were determined. The parameters changed with concentration and chain length of alcohols in methylformate system. Strength of intermolecular interaction of alcohols with methyl formate determined as 1-butanol<1-pentanol<1-hexanol

KEYWORDS: Methyl formate; alcohols and dielectric relaxation

Copy the following to cite this article:

Elangovan S, Amente D. W. Intermolecular Interaction of Methyl Formate with 1-butanol, 1-Pentanol and 1-Hexanol at 303K. Mat.Sci.Res.India;14(2)


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Elangovan S, Amente D. W. Intermolecular Interaction of Methyl Formate with 1-butanol, 1-Pentanol and 1-Hexanol at 303K. Mat.Sci.Res.India;14(2). Available from: http://www.materialsciencejournal.org/?p=6624


Introduction

Intermolecular interaction among the liquid mixtures takes place a vital role in chemical industries and reseaech field.1-3. The dielectric relaxation studies take a vital role to elucidate the nature of interactions in a liquid system with polar and non polar molecules. 4,5 Methyl formate is used in various chemical and pharmaceutical industries.

Alcohols are highly polar and self associated through hydrogen bonding. The carbonyl group (C=O) exist in the methyl formate tends to form hydrogen bonding with hydroxyl (OH-) group of selected alcohols. The present work is an attempt to elucidate the molecular interactions between of methyl formate with1-butanol, 1-pentanol and1-hexanol using time domain reflectometry technique at 303K.

Materials and Methods

Methylformate and alcohols of AR grade were obtained from E-Merck India and used with out further purification. The purity of liquids analysed with the standard physical quality values. Dielectric constant (ε) and dielectric loss (ε’’ ) were obtained using oscillator of frequency 9.36 GHz at 303K. Abbe’s refractometer was used to determine refractive indices (µ) of the binary liquid system. Viscosities of the liquid mixture were measured by Ostwald’s viscometer. Densities were measured by using 5cc specific gravity bottle.

Methods

Higasi’s Method

Dielectric relaxation time (τ) was determined using Higasi’s method 6.Considering  є0 є,є’’ , є linearly changewith concentration of solute. The slopes a0,a,a’’and a were determined by the experimental results. Here

Formula

Mean relaxation time(τ0), dielectric relaxation ΔF τ and viscous flow were determined by  Eyring’s equation 7

Formula

Cole-Cole Method:

Determined values of  ε0, ε, ε’’ and ε are fitted in a graph. Diameter angle with respect to centre from  εpoint and abscissaaxis is equal to πα/2. Relaxation time τ was determined by

(ωτ)1-α =  V/U                                                                                                                          —–(5)

Result and Discussion

Dielectric parameters of the liquid mixtures have been determined as shown in the Table-1. The relaxation time varies with nature of bonding present in the  liquid system.

In this study, relaxation time (τ) changed with concentration and carbon chain length of alcohols. It shows that formation of hydrogen bond in carbonylgroup of methyl formate and hydroxyl group of the alcohols. More over the ε0 value changed with concentration of the alcohols. It reveals that decrease in the molar volume of the rotated molecules reduces the number of dipoles in the liquid mixture. It signifies that molar free energy of activation for viscous flow (ΔFη) is greater than dielectric relaxation (ΔFτ). It may elucidates that viscous flow involved in rotational and translation vibration of molecules 8-10. Hence strength of molecular interaction changed with proton donating ability of alcohols which was in the order of l-Butanol<1-Pentanol<1-Hexanol.

Table 1: Dielectric constant (ε0), relaxation time (τ) of methylformate with alcohols at 303K

 

Volume % of alcohols

 

 

ε0

 

 

ε

 

 

ε’’

 

 

ε

 

Relaxation Time  τ (ps)

Activation energy

 

Higasi’s

Cole-Cole

ΔF τ

kJ/mol

ΔF η

kJ/mol

τ (1)

τ (2)

τ (0)

τ

System : Methylformate + 1-Butanol

0

25

50

75

100

3.3800

3.2946

3.2204

3.1217

3.0594

2.7382

2.7627

2.7669

2.7515

2.734

0.9513

2.3334

9.957

12.834

11.28

4.5509

7.213

3.3800

0.966

2.3306

10.37

13.212

11.714

4.9086

7.514

3.2946

0.9863

2.3453

11.637

13.73

12.645

6.9302

7.871

3.2204

0.9765

2.3376

10.132

13.786

11.833

7.6757

7.577

3.1217

0.9688

2.3264

9.845

12.708

11.196

8.0992

7.143

3.0594

System : Methylformate + 1-Pentanol

0

3.2582

2.6675

1.624

2.9277

11.875

17.111

14.297

16.1191

7.465

3.2582

25

3.1609

2.6661

0.9114

2.8304

10.594

13.94

12.162

11.4032

7.297

3.1609

50

3.1595

2.6654

0.9121

2.8304

10.307

15.256

12.561

16.8527

5.974

3.1595

75

3.0846

2.6514

0.903

2.7548

9.88

11.777

10.79

10.8985

6.835

3.0846

100

3.0832

2.6577

0.9044

2.7527

9.866

12.519

11.119

17.6591

7.045

3.0832

System : Methylformate + 1-Hexanol

0

3.2428

2.6892

0.931

2.3488

12.932

20.107

16.152

18.9415

7.36

3.2428

25

3.1343

2.6717

0.9114

2.3425

11.854

16.866

14.15

14.9606

7.143

3.1343

50

3.1098

2.6724

0.9086

2.3446

11.959

16.747

14.164

19.7304

7.304

3.1098

75

3.0923

2.6675

0.9051

2.3369

11.063

14.045

12.47

14.6169

6.667

3.0923

100

3.0335

2.6241

0.9009

2.3362

11.014

13.24

12.078

20.5235

6.912

3.0335

 

Conclusion

Dielectric relaxation parameters have been determined for methylformate with 1-Butanol,1- Pentanol and 1- Hexanol prepared with various concentrations at 303K. Relaxation time changed with increasing proton donor in the liquid systems. The deviation of dielectric parameters with alcohols signifies that strength of molecular interaction of alcohols with methylformate was in the order of 1-Butanol<1-Pentanol<1-Hexanol.

Acknowledgment

The authors thank to Research and Development Centre, Department of Physics, Wollega University for provided the necessary facilities.

Conflict of interest

There is no conflict of interest between the authors.

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