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pH-metric and spectroscopic properties of new 4-hydroxysalicylidene-2-aminopyrimidine Schiff-base transition metal complexes

✍ Scribed by Abd El-Fatah Ouf; Mayada S. Ali; Eman M. Saad; Sahar I. Mostafa

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
343 KB
Volume
973
Category
Article
ISSN
0022-2860

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✦ Synopsis

The new complexes, cis-[WO 2 (Hsap) 2 ], [Ru(PPh 3 ) 2 (Hsap) 2 ], [Pd(Hsap)

and [Cu(Hsap)Cl(H 2 O)] are reported, where H 2 sap is 4-hydroxysalicylidene-2-amino pyrimidine Schiff-base. The complexes were characterized by elemental analyses, spectroscopic (IR, NMR, UV-vis, ESR and mass) and physical techniques (conductivity, magnetic and thermal measurements). The Schiff-base H 2 sap behaves as a bidentate chelate with the deprotonated 2-hydroxy and azomethine nitrogen centers with the pendant pyrimidine cyclic nitrogen functionality playing no role in coordination. The dissociation constants of H 2 sap and the stability constants of the metal complexes have been determined pH-metrically at various temperatures, and the thermodynamic activation parameters (DS Ã , DG Ã , DH Ã ) calculated.

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## Abstract It is shown that ligand **1**, designed to span __trans__‐positions, under appropriate conditions also gives __cis__‐mononuclear complexes of platinum (II). The structure of __cis__‐[PtCl~2~ **(1)**] **(2)** has been determined by single‐crystal X‐ray diffraction. The major distortion f