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IRJET- Kinetic Study of the Reaction of 5-Chlorosalicyaldehyde with M- Toluidine Spctrophotometrically
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1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 929 KINETIC STUDY OF THE REACTION OF 5-CHLOROSALICYALDEHYDE WITH M- TOLUIDINE SPCTROPHOTOMETRICALLY Bhausaheb K.Magar1, Vijay N Bhosale2, Anil S. Kirdant3 1,2Department of Chemistry, Shivaji Arts Commerce and Science College, Kannad, Dist. Aurangabad, Maharashtra, India. 3Baburaoji Adaskar Mahavidyalaya, Kaij Dist. Beed, Maharashtra, India. ----------------------------------------------------------------------***--------------------------------------------------------------------- ABSTRACT: The second order reaction rate constant for the reaction of 5-Chlorosalicylaldehyde with m-toluidine have been reported in ethanol at temperature range 303 to 318 k .The rate of reaction is first order with respect to 5- Chlorosalicylaldehyde and m-toluidine. The rate of reaction increases with increases in temperature. The thermodynamic parameters are used to explain the nature of reaction. Suitable reaction mechanism has been suggested for the formation of the Schiff base. From the effect of temperature on the rate of reaction various thermodynamic parameter have been evaluated. Keywords: Schiff base, 5-Chlorosalicylidene - m-toluidine, kinetics. 1. INTRODUCTION: The Schiff bases are also called as imines1, anilis and azomithines. The kinetic studies of Schiff base formation as well as other carbonyl addition reaction have been interested chemists for some time. Schiff bases derived from m- toluidiens and its derivative with aromatic aldehyde have a wide variety of applications in biological2,3 and analytical4 chemistry. Schiff bases are known to be neoplasm inhibitors5,6 antiviral7, anticonvulsants 8, antimicrobial 9, anticancer10, plant growth regulator 11 and antituburecular12, agents. The study of kinetics of formation and hydrolysis of Schiff bases has received a considerable attention due to its relevance to the transformation (conversion) of >C=0 to > C=N and vice versa in biochemical processes13-17.Schiff bases formation involves a two step reaction between the carbonyl compound and the amino compound. First, addition takes place to form a carbinolamine which then undergoes dehydration18 .Both step are reversible and subject to general acid – base catalyst 19. Literature survey reveals that a great deal of work has been reported on the complexation of metal ions with Schiff bases for the study of structure and stability of the complexes. The catalytic effect of hydrogen, hydroxyl and metal ions on the formation and hydrolysis of imines have been studied by several workers 16, 17, 20-23. In the present work we reported here kinetic study and mechanism of the formation of Schiff base, 5-Chlorosalicylaldehyde m-toluidine in ethanol medium spectrophotometrically. 2. EXPERIMENTAL AND METHODS: 2.1 Experimental Schiff base were prepared by refluxing equimolar quantity of 5-Chlorosalicylaldehyde and m-toluidine in ethanol medium for about three hours. The mixture was cooled and filtered to obtain solid Schiff base and recrystallised from ethanol. The purity was checked by melting point(880C) and TLC. Cl OH CH3 H2 N Cl Refiux EtOH CH3 C H O + OH C H N H2O+ 5-Chlorosalicylaldehyde m-toluidine Schiff base
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 930 2.2 kinetic measurements: lambert-beer’s law: The rate of formation of Schiff base was followed by spectrophotometer at λmax. By using UV-VIS, 1601 Shimuadzu Spectrophotometer. The basis of the spectrophtometry is Beer’s law. This relates the absorbancy of a solution to the concentration of the species present. The prerequisite of the spectrophtometry is the validity of the Beer’s law. It is possible to ascertain the concentration of a given species in solution if it absorbs radiation of a particular wavelength and obeys Beer’s law. True variation of this law can arise when moderately concentrated solutions are used. The law is obeyed only in dilute solutions. 2.3 Standard curves: The solution of Schiff base of various concentrations (0.001 M to 0.005 M) was prepared using ethanol solvent. Using 0.005 M solution, λmax was determined. The absorbance of each coloured solution was then measured, at this λmax 447.5 nm. The readings are recorded in Table-1.The plot of absorbance (optical density) versus concentration of the Schiff bases has been obtained as a straight line (Fig-1). The plot was used as standard curve for the determination of concentration of Schiff bases for the kinetic measurements. Table: 1. Optical Density at λmax 447.5 nm. Fig-1 : Standard Curve O.D Vs Concentration 2.4 Experimental procedure for kinetic measurements: 5-Chlorosalicylaldehyde solution (25ml) of desired molarity was taken into 50 ml flask. In another 50 ml flask m- toluidien solution (25 ml) of desired molarity were taken. Both the flasks were then allowed to stand in thermostatic water bath to attain the required temperature. Then content of the flask having m-toluidien solution transferred to the flask containing 5-Chlorosalicylaldehyde. Thus obtained reaction mixture was thoroughly shaken and kept in thermostatic water bath at desired temperature. After mixing, the reaction mixture was transferred to a quartz cell and the increase of absorbance due to Schiff base formation with time was followed against the blank kept in another quartz cell at λmax. At different time intervals solution was employed to determine optical density. From this optical density, concentration (x) of Schiff base present at particular time was determined with the help of the standard curve. It was observed that this method gave reproducible and quantitative result. Conc. Of SB O.D 0.000 0.000 0.001 0.264 0.002 0.435 0.003 0.648 0.004 0.838 0.005 1.055
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 931 2.5. Methods of calculations of the rate constant For the equimolar quantities of reactants, value of second order rate constant were calculated using relation 1 x k = at (a-x) If concentrations of reactants are different, the values of second order rate constants have been calculated by using relation 2.303 b(a-x) k = log (a-b)t a(b-x) Where, t = time in second. a = initial concentration of 5-Chlorosalicylaldehyde. b = initial concentration of m-toluidien. x = amount of Schiff base formed in time t. Graphical k values were obtained from the slope of the linear plot of 1/ (a-x) versus time (t) for equal concentration and plot of log [(a-x) / (b-x)] versus time (t) for unequal concentrations. 2.6 Order of reaction with respect to 5-Chlorosalicylaldehyde To determine the order of reaction with respect to 5-Chlorosalicylaldehyde, the reaction has been carried out at different concentrations of 5-Chlorosalicylaldehyde by keeping the concentration of m-toluidien constant at a particular temperature. van’t Hoff’s differential method24 was applied to determine the order with respect to 5-Chlorosalicylaldehyde by equation25-27. dc dc log Ι-log ΙΙ dt dt n = logcΙ-logcΙΙ The amount of product formed (x) was plotted against the time in minutes. From the curve, the values of dc/dt have been calculated. 2.7. Order of reaction with respect to m-toluidien The order of reaction with respect to m-toluidien was determined by varying concentration of m-toluidien by keeping the concentration of 5-Chlorosalicylaldehyde constant at a particular temperature. The order with respect to m- toluidien was determined by applying van’t Hoff’s differential method. The values of dc/dt were evaluated by plotting amount of product formed (x) against time (t) in minutes. From the effect of temperature on the reaction rate the energy of activation Ea, enthalpy of activation (ΔH*), entropy of activation (ΔS*), free energy (ΔG*) and frequency factor (A) were calculated.
4.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 932 3. RESULT AND DISCUSSION Kinetics of formation of Schiff bases was caried out at equal concentrarion.The second order rate constant was calculated by using equation of second order at equal concentration and graphical k valuses determined from the stiright line plots of 1/(a-x) verses time. 3.1. Reaction order: The kinetic study is carried out at different concentration of 5-Chlorosalicylaldehyde (1×10-3 to 5×10-3 mol dm-3) at constant concentration of m-toluidien (5×10-3 mol dm-3) in ethanol medium at 303 k .The plot of dc/dt against log [Cl- S.A] is liner and slope of plot was found to be nearly one, indicates the order with respect to 5-Chilorosalicylaldehyde is first order. Similarly the kinetic study is carried out at different concentration of m-toluidien (1×10-3 to 5×10-3 mol dm-3) at constant concentration of 5-Chlorosalicylaldehyde (5×10-3 mol dm-3) in ethanol medium at 303 k .The plot of dc/dt against log [m-toluidien] is liner and slope of plot was found to be nearly one, indicates the order with respect to m-me aniline is first order. 3.2. Effect of temperature on the rate of reaction: Kinetic measurements were carried out at four different temperatures 303,308,313 and 318 k at constant concentration of [Cl-S.A] (5×10-3 mol dm-3) and m-toluidien (5×10-3 mol dm-3) in ethanol. The second order rate constant depends on the reaction temperature 28-29 The thermodynamic parameters like energy of activation (Ea), enthalpy of activation (ΔH*), entropy of activation (ΔS*), free energy (ΔG*) and frequency factor (A) were calculated (Table 5). From the value of thermodynamic parameter it is observed that ΔH*and ΔS*are the important parameter in controlling the rate of reactions. The negative value of entropy of activation indicates that activated complex is less probable and rate is slower. The negative values of entropy of activation show that the intermediate transition state is rigid. The relatively small values of ΔH* and the negative ΔS* values are consistent with the reactions which generally proceeds through highly organized transitions stats 30. If both the reactants are likely charged, the charge density on the surface in the transitions state will be more and hence there can be increase in solvation leading again to a negative ΔS*31. Table: 2. Rate constant. Fig-2: Plot of 1/ (a-x) versus t Temp. (k) k×103 (dm3mol-1 s-1) 303 466.86 308 83.399 313 88.472 318 114.824
5.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 933 The rate constant values of Schiff base formation at different temperature are listed in the Table-4.The rate of formation of Schiff bases increases with increasing temperature. The plot of log k versus 1/T is straight line (Fig.3) Table 3. Thermodynamic parameters. Fig-3: Plot of log k versus 1/T Schiff bases formation involves a two step reaction between the carbonyl compound and the amino compound. First addition takes place to form a carbinolamine which then undergoes dehydration. Both steps exhibit general acid base catalysis 32, 33. Cl OH CH3 H2N Cl fast CH3 OH H C H O + OH C H N 5-Chlorosalicyaldehyde Carbnolamine(Unstable)m-toluidine Cl H + CH3 OH2 H slow OH C H N + Ea 48.355 kJ A 1.01 x 107 ΔH* 45.835 kJ ΔS* -110.981 JK-1 mol-1 ΔG* 79.463 kJ mol-1 Cl CH3 OH H OH C H N
6.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 934 Cl CH3 OH2 H OH C H N + Cl -H2O CH3 H H OH2 OH C N + Cl CH3 H H OH C N Cl CH3 H H -H+ slow OH C N + Schiff base (Scheme.1) It was found that the reaction was first order in the carbonyl compounds and first order in amine. Spectroscopic studies have revealed that, under mild acidic condition there is a fast disappearance of the carbonyl function followed by a slow appearance of the product 34. Under mild acidic condition, rapid addition of amine to the carbonyl compound followed by the acid-catalysed dehydration of the adduct is the rate-controlling step. An increase in acidity would promote the reaction because it increases the rate of dehydration step. But with a further increase in acidity the nucleophile (RNH2) may get protonated (RN+H3) and, thus deprived of its lone pair of electrons and is no longer in a position to attack the positive carbonyl carbon ( Scheme.1). REFERENCES [1] Jerry March; Advanced Organic Chemistry, Mechanism and Methods of Determining Them, 4th ed. Wiley India Pvt, Ltd. 1992. [2] S.M Jadhav. V.A Shelke. A.S Munde. S.G Shankarwar. T.K Chondhekar. J. Coord. Chem., 2010, 63, 4153. [3] V.A Shelke. S.M Jadhav. S.G Shankarwar. A.S Munde. T.K Chondhekar. J. Korean Chem. Soc., 2011, 55, 436. [4] P.R Patel and S Zele. Ind. Chem., 1999, 38A, 563. [5] S.P Chatterjee. B Sur and SR Chaudhary. Oncology., 1990, 47(5), 433. [6] V.S Jolly. Orient J. Chem. 1994, 10(3), 297. [7] P.H Wag. J.G Keck and L Michael. J. Med. Chem., 1990, 33(2), 608. [8] A.L Cates and Rasheed. Pharm. Res., 1984, 6, 271. [9] V.A Shelke. S.M Jadhav. S.G Shankarwar. A.S Munde. T.K Chondhekar. Bull. Chem. Soc.Ethiop., 2011, 25(3), 1. [10] K.P Sharma. VS Jolly and Phatak. Ultra Sci.Phys.Sci., 1998, 10(2), 263. [11] Gaodeng Xuexiao Huaxe Xuebao and D Yin. 1996, 7(1), 91. [12] Polasa H. Indian .J. Pharm.Sci., 1985, 47, 202. [13] D.V Prabhu and N.B. Laxmeshwar J. Indian Chem. Soc., 1995, 72, 323. [14] V. Willi, Helv. Chem. Acta., 1956, 39,1193. [15] T.A Behme and E.H. Cordes. J. Am. Chem. Soc.,1965, 87, 260.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 935 [16] L. Reeves. J. Org. Chem., 1965, 30, 3129. [17] L. Doamaral, WA. Sandstorm and E.H. Cordes. J. Am. Chem. Soc., 1966, 88, 2225. [18] A. Lapworth. J. Chem. Sco., 1903 P Bartlett. J. Am. Chem. Sco., 1932, 54, 2881. [19] Kyu Sun Bai and D.L Leussing. J. Am. Chem. Soc., 1967, 89, 24. [20] Anil S Kirdant, Bhausaheb K Magar,and Trimbak K Chondhekar ,Der Chemica Sinica,2012,3(1),52-58. [21] Anil S Kirdant, Bhausaheb K Magar, and Trimbak K Chondhekar, J.Chem.Bio.Phy. Sci.Sec.A, Nov.2011-Jan.2012, Vol.2, No.1, 147-153. [22]Bhausaheb K Magar, Vijay N. Bhosale Anil S Kirdant and Trimbak K Chondhekar , ,J.Chem.Bio.Phy.Sci.Sec.A,Nov.2011- Jan.2012,Vol.2,No.1,127-131. [23] A.C Dash. B. Dash and P.K. Mohapatra. J. Chem. Soi. Dalton Trans., 1983, 1503, 1505. [24] Bauer and Exner. Angew Chem. Int. Ed. Eng. 1974, 13, 376. [25] B .K Magar ,A.S Kirdanta, V.A. Shelke, S.G. Shankarwar, and T.K Chondhekar, J. Chem.Pharm. Res., 2011, 3(5), 116-123. [26] Bhausaheb K Magar,Anil S Kirdant and Trimbak K Chondhekar ,Der Chemica Sinica,2011,2(6),250-257. [27] Bhausaheb K Magar,Anil S Kirdant and Trimbak K Chondhekar , ,J.Chem.Bio.Phy.Sci.Sec.A,Nov.2013-Jan.2014 Vol.4,No.1,70-77. [28] R.S Shettar and S.T Nandibewoor. Int. J. Chem. Soc. 2004, 2(3), 419. [29] Rajeev Kumar Singh and Kaushaiendra Kumar. Int. J. Chem. Sci., 2004, 2(1), 52. [30] M.R Bruce. J. Phy. Chem., 1964, 68, 1369 [31] M.U Khan. Sanjaykumar Singh. H.D Gupta and P.K Singh. Asian Journal of Chem., 2003, 14(2), 595 [32] W.P Jencks. Progr. Phys. Org. Chem., 1964, 2, 63. [33] T.C Bruice and S.J Benkovic Bioorganic Mechanisms, WA Benjamin. Inc. New York,N.Y. 1966. [34] Santly. H Pine. Organic Chemistry 5th Edition Tata McGraw Hill, Publishing Company Limited New Delhi. 2007, 248.
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