VUV photochemistry of cyclopropenone (c-CHO): formation rate and abundance ratios of propynal (HCCCHO) and propadienone (CHCCO).

The distribution of isomeric species in the interstellar medium cannot be directly related to their relative energetic stabilities but more to their mechanisms of formation and evolution. The abundances of the three isomers of CHO, cyclopropenone, propynal and propadienone, are an example among many other interstellar species wherein kinetic effects control their presence in astrophysical regions. To date, only propynal and cyclopropenone, the two less stable isomers of propadienone, have been detected in the interstellar medium.

-Unsubstituted 2- and 3-thiophenimines.

-Unsubstituted 2-thiophenemethanimine and 3-thiophenemethanimine are the simplest derivatives of a family of imines, the thienyl imines. These two thienyl aldimines and the -methyl derivatives were prepared in a gas solid reaction by dehydrocyanation of the corresponding α-aminonitriles or in the gas phase by a retro-ene reaction from -allyl derivatives, then characterized by IR and NMR spectroscopy at low temperature and used in transimination reactions. From several angles, these compounds in the free or complexed state have been compared to the corresponding recently synthesized furanimines and to other -unsubstituted imines, with the aim of studying the specificity of each of them.

Characterization of 1,1- and 1,2-ethenedithiol, elusive compounds of potential astrochemical interest.

Context: 1,1- and 1,2-ethenedithiol are elusive systems that could potentially exist in interstellar space, similar to analogous diols. In this paper, we investigate the structure, stability, and bonding characteristics of these compounds as well as the ions produced by protonation, deprotonation, or simple ionization processes. 1,2-ethenedithiol has two isomers, Z and E, with the most stable conformer being syn-anti for the Z isomer and anti-anti for the E isomer.

Combined experimental and computational study of the reactivity of the methanimine radical cation (HCNH˙) and its isomer aminomethylene (HCNH˙) with propene (CHCHCH).

The gas phase reactivity of the radical cation isomers HCNH˙ (methanimine) and HCNH˙ (aminomethylene) with propene (CHCHCH) has been investigated by measuring absolute reactive cross sections and product branching ratios, under single collision conditions, as a function of collision energy (in the range ∼0.07-11.80 eV) using guided ion beam mass spectrometry coupled with VUV photoionization for selective isomer generation.

Taste cells expressing Ionotropic Receptor 94e reciprocally impact feeding and egg laying in Drosophila.

Chemosensory cells across the body of Drosophila melanogaster evaluate the environment to prioritize certain behaviors. Previous mapping of gustatory receptor neurons (GRNs) on the fly labellum identified a set of neurons in L-type sensilla that express Ionotropic Receptor 94e (IR94e), but the impact of IR94e GRNs on behavior remains unclear. We used optogenetics and chemogenetics to activate IR94e neurons and found that they drive mild feeding suppression but enhance egg laying.