Cyanoisocyanoacetylene, N≡C-C≡C-N≡C

Area of Science:

• Organometallic Chemistry
• Spectroscopy
• Computational Chemistry

Background:

• The synthesis and characterization of novel organometallic compounds are crucial for advancing chemical understanding.
• Isomerization reactions in metal carbonyl complexes can lead to unique structural motifs.
• Understanding the relative stability of isomers is key to predicting reaction pathways.

Purpose of the Study:

• To isolate and elucidate the structure of a novel isomer formed from the vacuum pyrolysis of a specific chromium precursor complex.
• To determine the energetic stability of the newly synthesized isomer relative to known compounds using computational methods.
• To accurately determine the equilibrium structure of the novel isomer through a combination of experimental and theoretical approaches.

Main Methods:

• Vacuum pyrolysis of the precursor complex [(CO)5Cr(CN-CCl=CF-CN)].
• Structure elucidation using molecular spectroscopy.
• Ab initio calculations to assess relative isomer stability.
• Mixed experimental and theoretical methods for accurate equilibrium structure determination.

Main Results:

• Isolation and structural characterization of isomer 1.
• Molecular spectroscopy confirmed the structure of isomer 1.
• Ab initio calculations indicated isomer 1 is 109 kJ/mol less stable than NC-C≡C-CN.
• An accurate equilibrium structure for isomer 1 was determined.

Conclusions:

• The vacuum pyrolysis of the precursor complex successfully yielded a new isomer.
• The novel isomer is energetically less favorable than a known related compound.
• The study provides a precise structural determination of the new isomer, combining experimental and computational insights.