A Lead-μ₂-Tetrylide Complex with Osmium(IV) Terminal Components.

Area of Science:

• Organometallic Chemistry
• Main Group Chemistry

Background:

• A bare lead atom acts as a σ-donor ligand.
• Lead can linearly bond and stabilize polyhydride complexes with high-valent metal centers.

Purpose of the Study:

• To prepare and characterize a novel μ2-tetrylide complex involving lead and osmium.
• To investigate the bonding interactions between lead and osmium in the complex.

Main Methods:

• Reaction of OsH6(PiPr3)2 with Pb{N(SiMe3)2}2.
• Characterization of the resulting μ2-tetrylide complex.

Main Results:

• Successful synthesis and characterization of (PiPr3)2H4Os═Pb═OsH4(PiPr3)2.
• Pb-Os bonds show electrostatic interactions and significant dative σ bonding from lead to osmium.
• Weak π-backdonation from osmium to lead was also observed.

Conclusions:

• A bare lead atom can effectively stabilize polyhydride complexes.
• The bonding in the Os-Pb-Os complex is primarily governed by dative σ bonds.
• This work expands the understanding of lead as a ligand in organometallic chemistry.