Hydrogen-Bonded Complexes of Methylnitrene

Area of Science:

• Physical Chemistry
• Computational Chemistry
• Spectroscopy

Background:

• Microsolvation effects are crucial for understanding nitrene reactivity in applied chemistry.
• Alkylnitrenes are fundamental species in organic synthesis and reaction mechanisms.

Purpose of the Study:

• To investigate the structural and reactive properties of microsolvated alkylnitrenes.
• To elucidate the role of hydrogen bonding in modifying nitrene behavior.

Main Methods:

• Matrix-isolation infrared (IR) and UV-vis spectroscopy at 6 K.
• Photolysis of amine precursors (CH3NHX) in solid argon.
• Deuterium (D)-isotope labeling experiments.
• Quantum chemical calculations (CASPT2//CASSCF).

Main Results:

• Formation and characterization of 1:1 complexes of triplet methylnitrene (CH3N) with water (H2O) and hydrogen chloride (HCl).
• Experimental and computational evidence confirmed nitrene center acting as a hydrogen bond acceptor.
• Photoexcitation at 310 nm induced competing reactions: rearrangement to imine and H-X bond insertion.

Conclusions:

• Hydrogen bonding stabilizes nitrene complexes and modulates their photochemical reactivity.
• The study provides fundamental insights into non-covalent interactions involving reactive intermediates.
• Detailed mechanisms for photoinduced reactions were elucidated through theoretical calculations.