Mixed ligand complexes of palladium(II) and platinum(II) with methionine and 2,4-disubstituted pyrimidines |
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Authors: | Badar Taqui Khan K. Murali Mohan G. Narsa Goud |
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Affiliation: | (1) Department of Chemistry, University College of Science, Osmania University, 500 007 Hyderabad, India;(2) Department of Chemistry, Nizam College, Osmania University, 500 001 Hyderabad, India |
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Abstract: | Summary Mixed ligand complexes ofcis-[M(MetH)Cl2] (M=Pd2+ and Pt2+; MetH=methionine) with 2,4-disubstituted pyrimidines were prepared and characterised. Thecis-[Pd(MetH)Cl2] complex reacted with cytosine (2-hydroxy-4-aminopyrimidine), isocytosine (2-amino-4-hydroxypyrimidine) and thiocytosine (2-thio-4-amino-pyrimidine) to form ternary complexes.cis-[Pt(MetH)Cl2] however reacted with cytosine, uracil (2,4-pyrimidine dione or 2,4-dihydroxypyrimidine) to yield the corresponding mixed ligand complexes. The primary ligand, methionine, binds to the metal ion through sulphur and amino nitrogenvia a six membered chelate ring. The secondary ligands (substituted pyrimidines) bind to the Pd2+ or Pt2+ metal ion through the ring nitrogen (N3), as monodentate ligand. Thiocytosine however acts as a bidentate ligand, coordinating to the metal ion through-SH and ring nitrogen (N3). All complexes are 11 electrolytes, except the thiocytosine complex, which is a 12 electrolyte. |
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