NMR identification of hexamethylenetetramine and its precursor in Titan tholins: Implications for Titan prebiotic chemistry

被引：22
|
作者：
He, Chao [1 ]
Lin, Guangxin [1 ]
Smith, Mark A. [1 ,2 ,3 ]
机构：
[1] Univ Arizona, Dept Chem & Biochem, Tucson, AZ 85721 USA
[2] Univ Arizona, Dept Planetary Sci, Lunar & Planetary Lab, Tucson, AZ 85721 USA
[3] Univ Houston, Dept Chem, Houston, TX 77204 USA
来源：
ICARUS | 2012年 / 220卷 / 02期
关键词：
Titan; Organic chemistry; Prebiotic chemistry; ATMOSPHERIC AEROSOLS; ORGANIC-CHEMISTRY; AMINO-ACIDS; INTERSTELLAR; ANALOGS; GAS; FORMALDEHYDE; SOLUBILITY; PYROLYSIS; PRODUCTS;
D O I：
10.1016/j.icarus.2012.06.007
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The reddish brown organic haze surrounding Titan has been investigated using methods including remote observation, direct exploration (the Cassini mission) and laboratory simulations, but its formation mechanism and the contributing chemical structures and prebiotic potential are still not well understood. We report here the structural investigation of the (3C) and N-15 labeled, simulated Titan haze aerosol (tholin) using solution-state NMR. These spectra demonstrate a material composed of a mixture of moderate polymer and small molecules. Hexamethylenetetramine (HMT) is identified as the major small molecule component in the Titan tholin and its precursor (1,3,5-hexahydrotriazine) is also detected. We discuss the formation mechanism of HMT and its implications for Titan and early Earth prebiotic chemistry. (C) 2012 Elsevier Inc. All rights reserved.
引用
收藏
页码：627 / 634
页数：8
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