Stereospecific ligands and their complexes. Part XVII. Synthesis and characterization of ethylenediamine-N,N′-di-S,S-2-(3-methyl)butanoic acid and its platinum(IV) complex with bromido ligands. Crystal structure of s-cis-[PtBr<inf>2</inf>(S,S-eddv)]·H<inf>2</inf>O

Abstract

The synthesis of novel platinum(IV) complex of formula [PtBr 2(S,S-eddv)]·H2O (S,S-eddv = ethylenediamine-N, N′-di-S,S-2-(3-methyl)butanoate ion) is reported. The complex has been obtained by direct reaction of potassium-hexabromidoplatinate(IV) with neutralized ethylenediamine-N,N′-di-S,S-2-(3-methyl)butanoic acid (H 2-S,S-eddv). The ligand and complex were characterized by elemental analysis, infrared, 1H and 13C NMR spectroscopy. The spectroscopically predicted geometrical configuration of the obtained complex was confirmed by X-ray analyses of the crystal structure of the s-cis-[PtBr 2(S,S-eddv)]·H2O. The asymmetric unit of the complex contains three crystallographically independent s-cis-[PtBr 2(S,S-eddv)] and water molecules. The Pt(IV) atom in each complex molecule exhibits a distorted octahedral coordination geometry, built up by two cis-coordinated bromido ligands and one cis-N,N′ and trans-O,O′ coordinated S,S-eddv ligand (configuration index: OC-6-33). In the crystal structure, intermolecular N-H-O hydrogen bonds are found between the complex and water molecules. © 2014 Elsevier Ltd. All rights reserved.