Raulin F, Bruston P, Paillous P, Sternberg R
EPCOS-LPCE, University Paris-Val de Marne, Crèteil, France.
Adv Space Res. 1995 Mar;15(3):321-33. doi: 10.1016/s0273-1177(99)80104-5.
Organic chemistry on Titan and prebiotic chemistry on Earth involve the same N-containing organics: nitriles and their oligomers. Couplings of their chemistry in the three parts of Titan's geofluid (atmosphere, aerosols and surface) seem to play a key role in the organic chemical evolution of the planet. If liquid water was present on Titan, then a prebiotic chemistry, involving eutectics, similar to that of the early Earth, may have occurred. However, liquid water is currently absent and a prebiotic chemistry based only on N-organics may be evolving now on Titan. The other consequence of the low temperatures of Titan is the possible formation of organics unstable at room temperature and very reactive. So far, these compounds have not been systematically searched for in experimental studies of Titan's organic chemistry. C4N2 has already been detected on Titan. Powerful reactants in organic chemistry, CH2N2, and CH3N3, may be also present. They exhibit spectral signatures in the mid-IR strong enough to allow their detection at the 10-100 ppb level. They may be detectable on future IR spectra (ISO and Cassini) of Titan.
腈及其低聚物。土卫六地球流体（大气、气溶胶和表面）三个部分中它们的化学耦合似乎在该行星的有机化学演化中起关键作用。如果土卫六上存在液态水，那么可能发生了一种类似于早期地球的涉及共晶的前生物化学过程。然而，目前土卫六上不存在液态水，一种仅基于氮有机物的前生物化学过程可能正在土卫六上演变。土卫六低温的另一个后果是可能形成在室温下不稳定且反应性很强的有机物。到目前为止，在土卫六有机化学的实验研究中尚未对这些化合物进行系统的搜寻。C4N2已在土卫六上被探测到。有机化学中强大的反应物CH2N2和CH3N3可能也存在。它们在中红外波段表现出足够强的光谱特征，使其能够在10 - 100 ppb水平被探测到。它们可能在未来土卫六的红外光谱（ISO和卡西尼号）中被探测到。
