Distinctive Spectral and Potentiometric Studies of Some phenylhydrazonos Schiff base with metal complexes | ||||
| Journal of Basic and Environmental Sciences | ||||
| Volume 5, Issue 1, January 2018, Page 25-33 PDF (498.03 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jbes.2018.369756 | ||||
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| Authors | ||||
| N.M. Ali; M. M. Moustafa; E.H. El-Mossalamy; F.M. El-Naggar | ||||
| Chemistry Department, Faculty of Science, Benha University, Benha, 13518, Egypt. | ||||
| Abstract | ||||
| The spectral behavior of some Schiff base compounds derived from 2-((2,4-dihydroxyphenyl) (hydroxy)methyl)-2- phenylhydrazono)propanal,2-(2-(hydroxy(2-hydroxy-4-methoxyphenyl)methyl)-2-phenylhydrazono)propanal,3-(2-(hydroxy (2-hydroxy-4-methoxyphenyl)methyl)-2-phenylhydrazono)butan-2-one and 2-(-(2,4-dihydroxybenzylidene) hydrazono)-1,2- diphenylethanone to investigate the acid ionization constants (pKH) of these ligands using Half-height method and Modified limiting absorbance method. A series of new metal chelates of Co(II), Cu(II), Gd(III), Sm(III) and Tb(III) with Schiff base ligands derived from condensation of glyoxal, biacetyl or benzyl bishydrazone with 2,4 – dihydroxybenzaldhyde and 4- methoxysaliycaldhyde in ethanol and characterized via potentiometric titrations. Stability constants of these metal complexes were determined using a potentiometric method by calculating the values of n̅ A, n̅ and pL and found in the order Co(II)<Cu(II)<Tb(III)<Sm(III)<Gd(III). It has been found that ligand forms complexes in 1:1 ratio. | ||||
| Keywords | ||||
| Schiff base complexes; Potentiometry; Spectrophotometry; Stability constant | ||||
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