Copper-biomolecule complexes in the gas phase. The ternary way

Area of Science:

• Coordination Chemistry
• Mass Spectrometry
• Computational Chemistry

Background:

• Copper complexes with organic and bioorganic molecules are synthesized and studied.
• Gas-phase ions are produced using electrospray and other ionization techniques.
• Copper ions can exist in different oxidation states (Cu(I) and Cu(II)) and coordination spheres.

Purpose of the Study:

• To review the experimental and theoretical studies of gas-phase copper complexes.
• To highlight the applications of mass spectrometry in analyzing these complexes.
• To explore the role of copper complexes in modifying oxidation states and inducing novel reactions.

Main Methods:

• Experimental studies using mass spectrometry.
• Theoretical computations including ab initio and density functional theory (DFT).
• Electrospray and other ionization methods for generating gas-phase ions.

Main Results:

• Ternary Cu(II) complexes enable modification of copper's oxidation state and coordination sphere, leading to redox and radical-based fragmentations.
• Mass spectrometry of ternary copper complexes facilitates structure elucidation and isomer/enantiomer distinction (e.g., leucine/isoleucine, chiral compounds).
• Sensitive detection of antibiotics is achievable using these mass spectrometry techniques.
• Binary copper complexes primarily involve Cu(I) species exhibiting weak Lewis acid properties.

Conclusions:

• Mass spectrometry of copper complexes, particularly ternary Cu(II) complexes, offers powerful analytical capabilities.
• These methods are valuable for isomer differentiation, chiral analysis, and sensitive analyte detection.
• Copper complexes serve as versatile tools in analytical chemistry and coordination chemistry research.