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Volumn 37, Issue 19, 1998, Pages 2685-2689

Olefin metathesis of a ruthenium carbene complex by electrospray ionization in the gas phase

Author keywords

Carbene complexes; Gas phase chemistry; Mass spectrometry; Metathesis; Ruthenium

Indexed keywords


EID: 0032538356     PISSN: 14337851     EISSN: None     Source Type: Journal    
DOI: 10.1002/(SICI)1521-3773(19981016)37:19<2685::AID-ANIE2685>3.0.CO;2-M     Document Type: Article
Times cited : (169)

References (80)
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    • Selection of one isotopomer of 6 (n=1), followed by CID with 1.4 mTorr argon in the collision cell at a collision energy of approximately 50 eV (laboratory system) leads to the following masses (relative intensity) in the daughter spectrum: 225 (0.38), 284 (0.69), 546 (1.0), 640 (0.86). The first two masses appear as daughter ions in the CID of 2.
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    • The simplest possible kinetic model was used in which up to four sequential pseudo-first order differential rate expressions were numerically integrated with the POWERSIM (Modelldata AS) computational package. Because of the finite transit time through the collision cell, the integration was carried out to a fixed (arbitrary) time. The absolute rates are therefore also arbitrary, but the relative rates are physically meaningful.
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    • The ion residence time can be measured by simultaneous scanning of the quadrupoles before and after the octopole collision cell and monitoring the ion current at a given mass as a function of time delay between the two quadrupoles. The measured residence times are on the order of several milliseconds for collision gas pressures of several millitorrs. The results agree very well with the model, indicating that the reaction in the collision cell can be considered as a thermal reaction at the manifold temperature of 70°C.
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