Detection of a branched alkyl molecule in the interstellar medium: iso-propyl cyanide

  title={Detection of a branched alkyl molecule in the interstellar medium: iso-propyl cyanide},
  author={Arnaud Belloche and Robin T. Garrod and Holger S. P. M{\"u}ller and Karl M. Menten},
  pages={1584 - 1587}
Carbon chains branch out on space dust Meteorites found on Earth contain a wide range of complex constituent molecules, including amino acids. Astrochemists proposed the existence of these molecules in interstellar space in the 1980s, but detections have been elusive. Belloche et al. used the ALMA telescope array in Chile to observe the massive star-forming region Sgr B2. There, the vast quantities of gas enabled detection of even sparsely distributed species such as iso-propyl cyanide. Despite… 

Simulations of branched carbon-chain chemistry in star-forming regions

  • R. Garrod
  • Chemistry
    Proceedings of the International Astronomical Union
  • 2017
Abstract The detection of iso-propyl cyanide (i-C3H7CN) toward the Galactic Center hot-core source Sgr B2(N) (by Belloche et al. 2014) marked the first interstellar detection of an aliphatic molecule

A study of interstellar aldehydes and enols as tracers of a cosmic ray-driven nonequilibrium synthesis of complex organic molecules

It is shown in a combined experimental, computational, and astrochemical modeling study that interstellar aldehydes and enols act as key tracers of a cosmic-ray-driven nonequilibrium chemistry leading to complex organics even deep within low-temperature interstellar ices at 10 K.


In an effort to further our interest in understanding the basic chemistry of interstellar molecules, here we carry out an extensive investigation of the stabilities of interstellar carbon chains; Cn,

On the formation of complex organic molecules in the interstellar medium: untangling the chemical complexity of carbon monoxide-hydrocarbon containing ice analogues exposed to ionizing radiation via a combined infrared and reflectron time-of-flight analysis.

The present research investigates experimentally the synthesis of carbon, hydrogen, and oxygen bearing COMs from interstellar ice analogues containing carbon monoxide and methane, as well as the propyl and isopropyl moieties (C3H7), which have already been detected in the ISM via propyl cyanide and isanal.

Molecular complexity in the interstellar medium

  • A. Belloche
  • Physics, Chemistry
    Proceedings of the International Astronomical Union
  • 2019
Abstract The search for complex organic molecules in the interstellar medium (ISM) has revealed species of ever greater complexity. This search relies on the progress made in the laboratory to

The quest of chirality in the interstellar medium

Context. All but one complex organic molecule (COM) detected so far in the interstellar medium (ISM) are achiral; propylene oxide (c-C2H3O)-CH3 is the only exception to this. Finding other chiral

Looking for the bricks of the life in the interstellar medium: The fascinating world of astrochemistry

The discovery in the interstellar medium of molecules showing a certain degree of complexity, and in particular those with a prebiotic character, has attracted great interest. A complex chemistry

Astrochemical model to study the abundances of branched carbon-chain molecules in a hot molecular core with realistic binding energies

Straight-chain (normal-propyl cyanide, $\rm {n-C_3H_7CN}$) and branched-chain (iso-propyl cyanide, $\rm {i-C_3H_7CN}$) alkyl cyanides are recently identified in the massive star-forming regions

Laboratory blueprints for interstellar searches of aromatic chiral molecules: rotational signatures of styrene oxide.

The spectroscopic parameters and line lists of rotational transitions obtained here will assist future astrochemical studies of this class of chiral organic molecules.



Increased complexity in interstellar chemistry: detection and chemical modeling of ethyl formate and n-propyl cyanide in Sagittarius B2(N)

Context. In recent years, organic molecules of increasing complexity have been found toward the prolific Galactic center source Sagittarius B2. Aims. We wish to explore the degree of complexity that

Complex organic molecules in the interstellar medium: IRAM 30 m line survey of Sagittarius B2(N) and (M)

The discovery of amino acids in meteorites and the detection of glycine in samples returned from a comet to Earth suggest that the interstellar chemistry is capable of producing such complex organic

Amino acids in meteorites.

  • J. CroninS. Pizzarello
  • Biology
    Advances in space research : the official journal of the Committee on Space Research
  • 1983

Extraterrestrial Organic Compounds in Meteorites

Many organic compounds or their precursorsfound in meteorites originated in the interstellar or circumstellarmedium and were later incorporated intoplanetesimals during the formation of thesolar

Mechanisms of Amino Acid Formation in Interstellar Ice Analogs

The observation of multiple routes suggests that the formation of amino acids in interstellar ice analogs is not narrowly dependent on ice composition, but may occur under a variety of conditions that influence product distributions.


A new chemical model is presented that simulates fully coupled gas-phase, grain-surface, and bulk-ice chemistry in hot cores. Glycine (NH2CH2COOH), the simplest amino acid, and related molecules such


We investigate the formation and evolution of interstellar dust-grain ices under dark-cloud conditions, with a particular emphasis on CO2. We use a three-phase model (gas/surface/mantle) to simulate

Detection of HC11N in the Cold Dust Cloud TMC-1

Two consecutive rotational transitions of the long cyanopolyyne HC11N, J = 39 → 38 and 38 → 37, have been detected in the cold dust cloud TMC-1 at the frequencies expected from recent laboratory