Deuterium exchange rate between D3+ and organic CH bonds: Implication for D enrichment in meteoritic IOM

Details Deuterium exchange rate between D3+ and organic CH bonds: Implication for D enrichment in meteoritic IOM Deuterium exchange rate between D3+ and organic CH bonds: Implication for D enrichment in meteoritic IOM

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011gecoa..75.7522r&link_type=abstract

Geochimica et Cosmochimica Acta, Volume 75, Issue 23, p. 7522-7532.

Computer Science

Scientific paper

The rate of the transfer of deuterium from D3+ to the three types (benzylic, aliphatic and aromatic) of bonds of 2-Ethylnaphthalene (and Methylnaphthalene) has been measured in the laboratory. The D/H ratio of each bond was calculated from the mass spectrum of the different isotopomers produced in the source of the GC mass spectrometer. The relations between the D/H ratio of the different isotopomers allow to calculate the internal isotopic fractionation factors (αi-j = (D/H)i/(D/H)j) between the 3 bonds: αBenzylic-Aromatic = 1.99 ± 0.38 and αAliphatic-Aromatic = 1.22 ± 0.39. Isotopic exchange rate constants are ⩾2.2 × 10-7±0.4 s-1, determined at room temperature for 10-3 g of 2-Ethylnaphthalene in contact with 5 × 1012 cm-3 of D3+. These results are compatible with those measured in the insoluble organic matter (IOM) isolated from the Orgueil meteorite (Remusat et al., 2006), i.e., αBenzylic-Aromatic = 1.96 ± 0.05 and αAliphatic-Aromatic = 1.35 ± 0.05. Using the calculated dust and H2D+ densities from the models of deuterium chemistry in protostellar disks, the duration needed to enrich the IOM up to its measured D/H ratio is ⩽104±1 s. These laboratory results are in agreement with a late deuteration of the insoluble organic matter taking place in the solar T-Tauri disk by interaction of the organic dust with H2D+.

Affiliated with

Also associated with

No associations

Rating

Deuterium exchange rate between D3+ and organic CH bonds: Implication for D enrichment in meteoritic IOM does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Deuterium exchange rate between D3+ and organic CH bonds: Implication for D enrichment in meteoritic IOM, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Deuterium exchange rate between D3+ and organic CH bonds: Implication for D enrichment in meteoritic IOM will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1608058