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Nalawade R.A.,Shivaji University | Nalawade R.A.,Lalbahadur Shastri College | Nalawade A.M.,Lalbahadur Shastri College | Londhe B.S.,Karmaveer Bhaurao Patil Mahavidyalaya | Shejwal R.V.,Lalbahadur Shastri College
Research Journal of Chemistry and Environment | Year: 2015

Nowadays eco-friendly green synthetic methodologies are in great demand. A series of new Schiff's base derivative of thiocarbonohydrazide were synthesized by condensation of thiocarbonohydrazide with different substituted aromatic aldehydes and ketone under microwave irradiation without catalyst and under solvent free condition as a green chemistry approach. Within few minutes, reaction proceed selectively giving high yields of the products. The structures of these products were confirmed by spectral analysis. Source

Nalawade R.A.,Shivaji University | Nalawade R.A.,Lalbahadur Shastri College | Nalawade A.M.,Lalbahadur Shastri College | Kamble G.S.,Shivaji University | Anuse M.A.,Shivaji University
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2015

Abstract A rapid and simple spectrophotometric method was developed for the determination of copper(II) by using newly synthesized chromogenic reagent, N″,N⌄-bis[(E)-(4-fluorophenyl)methylidene]thiocarbonohydrazide [bis(4-fluoroPM)TCH]. The reagent is highly sensitive and it forms yellow colored ternary complex with copper(II) in presence pyridine having composition 1:1:2 (M:L:Py) in the acidic pH range. Absorption of colored complex in amyl acetate is measured with reagent as a blank at kmax 375 nm. The synergistic effect is observed due to pyridine forming adduct with reagent in the organic phase. Beer's law was obeyed in the concentration range from 2.0 to 14 μg mL-1 for copper(II)-[bis(4-fluoroPM)TCH]-Py complex. Molar absorptivity and Sandell's sensitivity values for Cu(II)-bis(4-fluoroPM)TCH]-Py complex are 0.42545 × 105 and 0.0014 μg/cm2, respectively. The selectivity of the developed method was checked in the presence of various foreign ions. The developed method showed relative standard deviation (R.S.D.) of 0.13% for n = 10. The composition of Cu(II)-[bis(4-fluoroPM)TCH]-Py complex was determined by known methods such as Job's method of continuous variation, mole ratio method and slope ratio method. It is found that the ternary complex is stable for more than 24 h. Various factors influencing on the degree of complexation, such as, effect of pH, reagent concentration, synergent concentration, solvent etc. were studied. The accuracy and reliability of method was verified by AAS. This method is found to be simple, rapid and reproducible. © 2015 Published by Elsevier B.V. Source

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