Identification of Photochemically Generated Volatile Species of Ruthenium and Osmium Using Direct Analysis in Real Time Mass Spectrometry
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View abstract on PubMed
Summary
This summary is machine-generated.This study coupled photochemical vapor generation with direct analysis in real time-high resolution mass spectrometry to identify volatile ruthenium and osmium carbonyls. The method successfully identified Ru(CO)5 and Os(CO)5, and OsO4 under oxidative conditions.
Area Of Science
- Analytical Chemistry
- Inorganic Chemistry
- Mass Spectrometry
Background
- Volatile metal carbonyls are challenging to identify due to their reactivity.
- Photochemical vapor generation (PVG) offers a method for generating volatile metal species.
- Direct analysis in real time (DART) high-resolution mass spectrometry (HRMS) provides sensitive detection capabilities.
Purpose Of The Study
- To identify unknown volatile carbonyls of Ruthenium (Ru) and Osmium (Os) generated via UV photolysis.
- To investigate the utility of coupling PVG with N2-based DART-HRMS for analyzing metal carbonyls.
- To elucidate the fragmentation and ionization pathways of metal carbonyls under DART conditions.
Main Methods
- Coupling of Photochemical Vapor Generation (PVG) with Direct Analysis in Real Time (DART) High-Resolution Mass Spectrometry (HRMS).
- Utilizing N2 as the discharge gas in DART-HRMS.
- Employing various photochemical media, including formic acid (HCOOH), nitric acid (HNO3), hydrogen peroxide (H2O2), and acetic acid (CH3COOH), with transition metal mediators (Co2+, Fe2+).
- Analysis of volatile standards like W(CO)6 and Fe(CO)5 to understand ionization mechanisms.
Main Results
- PVG-DART-HRMS successfully identified mononuclear Ru(CO)5 and Os(CO)5 generated from HCOOH-based media.
- Oxidative conditions using H2O2 or HNO3 led to the identification of OsO4.
- The presence of Co2+ as a mediator resulted in the co-generation of Co(CO)4H, complicating analysis.
- DART-HRMS revealed significant structural changes in carbonyls, including CO loss, oxidation, and hydration.
Conclusions
- The combined PVG-DART-HRMS technique is effective for identifying volatile Ru and Os carbonyls.
- The method provides insights into the formation and stability of metal carbonyls under photochemical conditions.
- Understanding DART ionization behavior is crucial for accurate identification of metal carbonyl species.
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