Backbonding Effects of Osmium(III): The Crystal Structure of µ-Pyrazinedecaammine-diosmium(II) Chloride Dihydrate

Avi Bino, Peter A. Lay, Henry Taube and James F. Wishart

Inorg. Chem. 24, 3969-3970 (1985)

Abstract:

The molecular structure of [(NH₃)₅Os(pyz)Os(NH₃)₅]Cl₆°2H₂O, which crystallizes in space group P2₁/n, is reported. The short Os-N(pyz) bond length (2.101(7)Å) as compared to the Os-N(ammine) bonds is indicative of strong pi-backbonding. Comparison of the data with the isostructural ruthenium complex shows that pi-backbonding for Ru(III) is weak in comparison to Os(III).