Air and water stable germacarbonyl compounds

Area of Science:

• Organometallic Chemistry
• Main Group Chemistry

Background:

• Germacarbonyl compounds are germanium analogs of carbonyls, typically requiring inert atmospheres due to unstable Ge[double bond, length as m-dash]E bonds.
• Previous attempts to stabilize these compounds under ambient conditions were hindered by the lability of the germanium-element double bonds.

Purpose of the Study:

• To synthesize and characterize novel germacarbonyl compounds that are stable under ambient conditions.
• To explore the reactivity of these stabilized compounds with copper(I) halides.

Main Methods:

• Synthesis of various germacarbonyl compounds (thiogermanone, selenogermanone, thiogermacarboxylic acid, selenogermacarboxylic acid, thiogermaester, selenogermaester, thiogermaamide, selenogermaamide) utilizing dipyrromethene ligand stabilization.
• Reaction of synthesized thiogermaamide and selenogermaamide with copper(I) halides (CuCl, CuBr, CuI) under atmospheric conditions.

Main Results:

• Successful isolation of several germacarbonyl compounds, including thiogermanone, selenogermanone, thiogermacarboxylic acid, selenogermacarboxylic acid, thiogermaester, selenogermaester, thiogermaamide, and selenogermaamide, exhibiting stable Ge[double bond, length as m-dash]E bonds (E = S, Se).
• Formation of air and water-stable monomeric and dimeric copper(I) complexes from the reaction of thiogermaamide and selenogermaamide with copper(I) halides.
• Observed selectivity in binding, with thiogermaamide binding CuCl and selenogermaamide binding CuBr when treated with a mixture of copper(I) halides.

Conclusions:

• Dipyrromethene ligand stabilization enables the synthesis of germacarbonyl compounds under ambient conditions, overcoming previous limitations.
• The synthesized germacarbonyl compounds can form stable copper(I) complexes, expanding their potential applications.
• Selective binding of copper(I) halides by different germacarbonylamide compounds demonstrates controlled reactivity.