Abstract
Pyrazole-3,5-dicarboxylate-bridged dinuclear ruthenium(II) and osmium(II) complexes of 2,2 ′-bipyridine of composition [(bpy) 2Ru(pzdc)Ru(bpy) 2](ClO 4) · H 2O ( 1) and [(bpy) 2Os(pzdc)Os(bpy) 2](ClO 4) · H 2O ( 2) have been obtained in high yield and have been separated to their homochiral (ΛΛ/ΔΔ) rac ( 1a, 2a) and heterochiral (ΛΔ/ΔΛ) meso ( 1b, 2b) diastereoisomers. The distinctive structural features of these diastereoisomers have been characterized by 1-D and 2-D 1H NMR spectroscopy. The X-ray crystal structure of rac-[(bpy) 2Os(pzdc)Os(bpy) 2](ClO 4) · H 2O ( 2a) has been determined. The electrochemical and electronic spectral studies have established that there remain difference in properties and hence difference in intermetallic communication between the diastereoisomeric forms in each case.
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