Polycyclic aliphatic hydrocarbons: is tetrahedrane present in UIR spectra?

Abstract

The smallest Platonic hydrocarbon, tetrahedrane, has been subject to frequent theoretical and experimental study for 50 years, but its infrared spectrum and synthetic pathway remain a mystery. The recent partial...

Bottom-Up Formation of Antiaromatic Cyclobutadiene (c-C4H4) in Interstellar Ice Analogs

“…These findings not only advance our fundamental understanding of the exotic chemistry and preparation of highly strained cyclobutadienes through non-equilibrium chemistry but also provide a potentially viable pathway for producing tetrahedranes such as the hitherto elusive tetrahedrane 2, which represents one of the most attractive challenges in organic chemistry that has not yet been accomplished. 34,35,50,51 As acetylene has been detected in the gas phase in circumstellar envelope and molecular clouds 52,53 and represents a major product of the photolysis and radiolysis of interstellar methane (CH 4 ) ices, 36 our results indicate that 1 can likely be formed within interstellar ices from methane-rich regions in deep space. Future laboratory experiments to identify 1 in processed methane ices can be carried out.…”

“…Our findings advance our fundamental understanding of the exotic chemistry and preparation of highly strained rings and antiaromatic systems through non-equilibrium chemistry in low-temperature environments, thus affording a possible route for the formation of elusive molecules such as tetrahedrane 2 (Scheme ). , Acetylene is a major product of the photolysis and radiolysis of interstellar methane (CH 4 ) ices, which has been detected toward low-mass young stellar objects with an abundance up to 11% relative to water (H 2 O) . Therefore, 1 can likely be formed in methane-rich ices in cold molecular clouds.…”

Biosynthesis and Characterization of Silver Nano-Composites of Enantia chlorantha Extracts

“…The presence of hydroxyl groups, common in organic compounds comprising alcohols or phenols, is indicated by a peak at 3433.41cm -1 corresponding to O-H stretching (Hamidu et al, 2020). C-H stretching vibrations, frequently present in aliphatic hydrocarbons, are shown by the 2931.90 cm -1 and 2870.17 cm -1 peaks (Westbrook et al, 2022). The absorption at 1716.70 cm -1 , which may have originated from carbonyl groups found in the extract's components, shows C=O stretching.…”

About Perfluoropolyhedranes, Their Electron‐Accepting Ability and Questionable Supramolecular Hosting Capacity

“…Tetrahedrane 1, the smallest, maximally strained, but sterically least encumbered of the Platonic polyhedranes (Table 1), has not yet been obtained despite relentless efforts, [35] although it may be present in the interstellar medium. [36] Tetrahedrane derivatives with four t-butyl or trimethylsilyl substituents, 9 and 10 were, however, synthesized (Fig- ure 1). [35,37] The remarkable thermal stability of 10 (up to 300 °C) was assigned to a "corset effect" provided by the enveloping bulky substituents.…”