Establishing a molecular relationship between chondritic and cometary organic solids

被引：188

作者：

Cody, George D. ^{[1
]}

Heying, Emily ^{[1
]}

Alexander, Conel M. O. ^{[2
]}

Nittler, Larry R. ^{[2
]}

Kilcoyne, A. L. David ^{[3
]}

Sandford, Scott A. ^{[4
]}

Stroud, Rhonda M. ^{[5
]}

机构：

[1] Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA

[2] Carnegie Inst Sci, Dept Terr Magnetism, Washington, DC 20015 USA

[3] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA

[4] NASA, Astrophys Branch, Ames Res Ctr, Moffett Field, CA 94035 USA

[5] USN, Res Lab, Washington, DC 20015 USA

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2011年 / 108卷 / 48期

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

ISOTOPIC COMPOSITIONS; C-13; NMR; MATTER; INTERSTELLAR; SPECTROSCOPY; 81P/WILD-2; ORIGIN; ICE; METEORITES; CHEMISTRY;

D O I：

10.1073/pnas.1015913108

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Multidimensional solid-state NMR spectroscopy is used to refine the identification and abundance determination of functional groups in insoluble organic matter (IOM) isolated from a carbonaceous chondrite (Murchison, CM2). It is shown that IOM is composed primarily of highly substituted single ring aromatics, substituted furan/pyran moieties, highly branched oxygenated aliphatics, and carbonyl groups. A pathway for producing an IOM-like molecular structure through formaldehyde polymerization is proposed and tested experimentally. Solid-state C-13 NMR analysis of aqueously altered formaldehyde polymer reveals considerable similarity with chondritic IOM. Carbon X-ray absorption near edge structure spectroscopy of formaldehyde polymer reveals the presence of similar functional groups across certain Comet 81P/Wild 2 organic solids, interplanetary dust particles, and primitive IOM. Variation in functional group concentration amongst these extraterrestrial materials is understood to be a result of various degrees of processing in the parent bodies, in space, during atmospheric entry, etc. These results support the hypothesis that chondritic IOM and cometary refractory organic solids are related chemically and likely were derived from formaldehyde polymer. The fine-scale morphology of formaldehyde polymer produced in the experiment reveals abundant nanospherules that are similar in size and shape to organic nanoglobules that are ubiquitous in primitive chondrites.

引用

页码：19171 / 19176

页数：6

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