The Stability and Decomposition of Gaseous [Mn(CO)5]2(μ-SiH2)

1988 ◽  
Vol 43 (8-9) ◽  
pp. 758-764 ◽  
Author(s):  
G.T. Stauf ◽  
D. La Graffe ◽  
P. A. Dowben ◽  
K. Emrich ◽  
S. Barfuss ◽  
...  
Keyword(s):  
Gas Phase ◽  
Mass Spectroscopy ◽  
Potential Application ◽  
Organometallic Compound ◽  
Thermodynamic Cycle ◽  
Decomposition Process ◽  
Ionization Mass ◽  
Uv Laser ◽  
Ionization Mass Spectroscopy ◽  
The Stability

Abstract The ionic decomposition of gaseous bridge-bonded dimanganese silyl carbonyl [Mn(CO)5]2(μ-SiH2) has been investigated via photon and electron induced ionization mass spectroscopy, as well as gas-phase photoabsorption measurements. The thermodynamic cycle incorporating ionic fragments has been constructed from these results. The thermodynamic cycle illuminates the decomposition process of this organometallic compound. This has potential application in the production of silicide Mn2Si coatings by both pyrolysis and by patterned photolysis using an UV laser.

scholarly journals Development of a photochemical source for the production and calibration of acyl peroxynitrate compounds

2015 ◽  
Vol 8 (5) ◽  
pp. 2225-2231 ◽  
Author(s):  
P. R. Veres ◽  
J. M. Roberts
Keyword(s):  
Dynamic System ◽  
Mass Spectroscopy ◽  
Chemical Ionization ◽  
Acyl Chloride ◽  
Ionization Mass ◽  
Gas Chromatograph ◽  
Iodide Ion ◽  
Ionization Mass Spectroscopy ◽  
Subsequent Separation ◽  
Standard Production

Abstract. A dynamic system for the calibration of acyl peroxynitrate compounds (APNs) has been developed in the laboratory to reduce the difficulty, required time, and instability of laboratory-produced standards for difficult-to-synthesize APN species. In this work we present a photochemical source for the generation of APN standards: acetyl peroxynitrate (PAN), propionyl peroxynitrate (PPN), acryloyl peroxynitrate (APAN), methacryloyl peroxynitrate (MPAN), and crotonyl peroxynitrate (CPAN). APNs are generated via photolysis of a mixture of acyl chloride (RC(O)Cl) and ketone (RC(=O)R) precursor compounds in the presence of O2 and NO2. Subsequent separation by a prep-scale gas chromatograph and detection with a total NOy instrument serve to quantify the output of the APN source. Validation of the APN products was performed using iodide ion chemical ionization mass spectroscopy (I- CIMS). This method of standard production is an efficient and accurate technique for the calibration of instrumentation used to measure PAN, PPN, APAN, MPAN, and CPAN.

scholarly journals FRAGMENTATION STUDIES OF D6,7-ANHIDROERITROMISIN-A BY LIQUID CHROMATOGRAPHY-MASS SPECTROSCOPY (LC-MS)

2010 ◽  
Vol 9 (3) ◽  
pp. 474-478
Author(s):  
Khairan Khairan ◽  
Umar A. Jenie ◽  
Retno S. Sudibyo
Keyword(s):  
Liquid Chromatography ◽  
Electrospray Ionization ◽  
Mass Spectroscopy ◽  
Saccharopolyspora Erythraea ◽  
Wave Number ◽  
Ionization Mass ◽  
Fragmentation Pattern ◽  
Ionization Mass Spectroscopy ◽  
Stretching Vibration ◽  
Two Peaks

Semisynthesis of D6,7-Anhydroerythromycin-A was done by biomodification technique by addition of 0.2% INH into a culture fermentation of Saccharopolyspora erythraea ATCC 11635 in medium Hutchinson. The aim of this research is to studies of fragmentation pattern from new matabolite of D6,7-Anhydroerythromycin-A by Liquid Chromatography-Mass Spectroscopy (LC-MS) and the ionization of mass spectroscopy is use by ESI (Electrospray Ionization) pattern. The FT-IR spectrometric analyzes showed a stretching vibration of C=C conjugated group at wave number 1602.7 cm-1. This C=C conjugated vibration indicated the existence of double bond between C6 and C7 (D6,7), this confirmed that isolate contained D6,7-Anhydroerythromycin-A (the possibility of D6,7 was positive). For complementation, a LC-MS (Liquid Chromatography-Mass Spectroscopy) analyzes using ESI-MS (Electrospray Ionization-Mass Spectroscopy) ionization pattern was conducted to the isolate which resulted Quassimolecular ions [M+H]+ of D7,8- and D6,7-Anhydroerythromycin-A. LC-MS spectrogram of the isolate, which gave two peaks of m/z 732.2460 and m/z 716.2522, confirmed that the m/z 732.2460 possibly was D7,8-Anhydroerythromycin-A, while the m/z 716.2502 and m/z 715.2522 possibly were D6,7-Anhydroerythromycin-A.   Keywords: isoniazid, enoyl reduction, D6,7-Anhidroeritromisin-A, fragmentation, LC-MS.

Diode-Laser-Initiated Resonance Ionization Mass Spectroscopy of Sm I

2000 ◽  
Vol 37 (5) ◽  
pp. 697-700 ◽  
Author(s):  
Hyunmin Park ◽  
Miran Lee ◽  
E. C. Jung ◽  
Jonghoon Yi ◽  
Yongjoo Rhee ◽  
...  
Keyword(s):  
Diode Laser ◽  
Mass Spectroscopy ◽  
Resonance Ionization ◽  
Ionization Mass ◽  
Ionization Mass Spectroscopy
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