Potentiometric Determination of the Stability Constants of 3-Thioacetyl-, and 2-benzoyl-3-amino-1, 4-naphthoquinone Chelates with Co(II), Ni(II) and Cu(II) Ions | ||||
| Assiut University Journal of Multidisciplinary Scientific Research | ||||
| Volume 48, Issue 1, June 2019, Page 35-41 PDF (782.61 K) | ||||
| Document Type: Novel Research Articles | ||||
| DOI: 10.21608/aunj.2019.220882 | ||||
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| Abstract | ||||
| The acid dissociation constant of the two ligands 3-thioacetyl-3-amino-1.4-naphthoquinone [L1] and 2-benzoyl-3-amino-1.4-naphthoquinone [L2] in ethanolic solution was determined by pH-metric technique at different temperatures (25, 35°C), and at various ionic strengths (I= 0.02, 0.1, 0.15 M NaCl) The stability constants of the formed chelates between L1 and L2 and Co(II) , Ni(II) and Cu(II) at two temperature degrees (25, 35°C) have been investigated . It has been found that it increase in the order Co (II) < Ni (II) < Cu (II) .The thermodynamic parameters (ΔGo, ΔHo, ΔSo ) of the chelates were deduced. | ||||
| Keywords | ||||
| Azo 2; 6-diaminopyridine; transition metal complex; antibacterial activity | ||||
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