Reaction Chalcone Study With differences Schiff Bases and Find Reaction Rate Constant by Using Florescence Technology

Abstract

This research include kinetics study (3) compound for new substituted Chalcones derived from drugs [ 1- ( 4-aminophenyl )-3-( furan-2-yl ) prop - 2-en-1-one ( C1 ), 3-methyl-4-(4- nitrobenzylidene)-1-phenyl-1H-pyrazol-5(4H)-one(C2) , 5-(3-phenylacryloyl)3H-spiro [benzofuran-2,1-cyclopropan]-3-one(C3) ] with different substituent Schiff bases [(E)-N-(4- nitrobenzylidene)-1-phenylmethanamine (B1), (E)-N-benzylidene-1-(4-bromophenyl) methanamine (B2), (E) -4- (binzylimino) methyl) -2-methoxyphenol (B3)] in alkaline media, such as potassium hydroxide solution in presence of 1,2.dichloromethane by using fluorescence technology to determine the rate constants of reaction , (the preparation of newly derivatives of Chalcones, through the reaction of each of compounds of pharmaceutical ketones and aldehydes by using Clesin -Schmidt condensation in the presence of ethanol solvent Furthermore, The structures of all compounds were identified by the physical and spectroscopic methods) , extensive kinetics measurement had been performed for the study of the interactions between Chalcones and Schiff bases ,applying two kinetics model pseudo first order for the product and second order for the intermediate state , through application of Arrhenius equation at different temperature (293-323K) It was obtained on the activation energies and A factors values, also the entropies of activation were calculated.it was found that the all measured rates and estimated energy factors were affected by many factors such as substituent and steric factors , the functioning confirms through which the nucleophile reaction.