Search results for: I. Kaiser

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article

Ist der Weltraum süß oder sauer?

Jia Wang, Joshua H. Marks, Ralf I. Kaiser, Ryan C. Fortenberry

Physik in unserer Zeit > 55 > 4 > 162 - 163

Mit Hilfe der Photoionisations‐Reflektron‐Flugzeit‐Massenspektrometrie konnten wir die Synthese von Glycerinsäure unter den Bedingungen eisiger Molekülwolken im tiefen Weltraum nachahmen. Dies simuliert den Übergang von kalten Molekülwolken zu Sternentstehungsgebieten. Die Ergebnisse liefern überzeugende Hinweise auf die Existenz von Glycerinsäure im nördlichen Kern von Sagittarius B2, einer riesigen...

article

One Collision—Two Substituents: Gas‐Phase Preparation of Xylenes under Single‐Collision Conditions

Iakov A. Medvedkov, Anatoliy A. Nikolayev, Chao He, Zhenghai Yang, more

Angewandte Chemie International Edition > 63 > 5 > n/a - n/a

The fundamental reaction pathways to the simplest dialkylsubstituted aromatics—xylenes (C₆H₄(CH₃)₂)—in high‐temperature combustion flames and in low‐temperature extraterrestrial environments are still unknown, but critical to understand the chemistry and molecular mass growth processes in these extreme environments. Exploiting crossed molecular beam experiments augmented by state‐of‐the‐art electronic...

article

One Collision—Two Substituents: Gas‐Phase Preparation of Xylenes under Single‐Collision Conditions

Iakov A. Medvedkov, Anatoliy A. Nikolayev, Chao He, Zhenghai Yang, more

Angewandte Chemie > 136 > 5 > n/a - n/a

article

Prebiotic Synthesis and Isomerization in Interstellar Analog Ice: Glycinal, Acetamide, and Their Enol Tautomers

Joshua H. Marks, Jia Wang, N. Fabian Kleimeier, Andrew M. Turner, more

Angewandte Chemie > 135 > 12 > n/a - n/a

Glycinal (HCOCH₂NH₂) and acetamide (CH₃CONH₂) are simple molecular building blocks of biomolecules in prebiotic chemistry, though their origin on early Earth and formation in interstellar media remain a mystery. These molecules are formed with their tautomers in low temperature interstellar model ices upon interaction with simulated galactic cosmic rays. Glycinal and acetamide are accessed via barrierless...

article

Prebiotic Synthesis and Isomerization in Interstellar Analog Ice: Glycinal, Acetamide, and Their Enol Tautomers

Joshua H. Marks, Jia Wang, N. Fabian Kleimeier, Andrew M. Turner, more

Angewandte Chemie International Edition > 62 > 12 > n/a - n/a

article

Unconventional Pathway in the Gas‐Phase Synthesis of 9H‐Fluorene (C₁₃H₁₀) via the Radical–Radical Reaction of Benzyl (C₇H₇) with Phenyl (C₆H₅)

Chao He, Ralf I. Kaiser, Wenchao Lu, Musahid Ahmed, more

Angewandte Chemie > 135 > 6 > n/a - n/a

The simplest polycyclic aromatic hydrocarbon (PAH) carrying a five‐membered ring—9H‐fluorene (C₁₃H₁₀)—is produced isomer‐specifically in the gas phase by reacting benzyl (C₇H₇⋅) with phenyl (C₆H₅⋅) radicals in a pyrolytic reactor coupled with single photon ionization mass spectrometry. The unconventional mechanism of reaction is supported by theoretical calculations, which first produces diphenylmethane...

article

Unconventional Pathway in the Gas‐Phase Synthesis of 9H‐Fluorene (C₁₃H₁₀) via the Radical–Radical Reaction of Benzyl (C₇H₇) with Phenyl (C₆H₅)

Chao He, Ralf I. Kaiser, Wenchao Lu, Musahid Ahmed, more

Angewandte Chemie International Edition > 62 > 6 > n/a - n/a

article

Gas Phase Preparation of the Elusive Monobridged Ge(μ‐H)GeH Molecule through Nonadiabatic Reaction Dynamics

Zhenghai Yang, Bing‐Jian Sun, Chao He, Siti Fatimah, more

Chemistry – A European Journal > 28 > 10 > n/a - n/a

The hitherto elusive monobridged Ge(μ‐H)GeH (X¹A′) molecule was prepared in the gas phase by bimolecular reaction of atomic germanium with germane (GeH₄). Electronic structure calculations revealed that this reaction commenced on the triplet surface with the formation of a van der Waals complex, followed by insertion of germanium into a germanium‐hydrogen bond over a submerged barrier to form the...

article

A Photoionization Study on the Detection of 1‐Sila Glycolaldehyde (HSiOCH₂OH), 2‐Sila Acetic Acid (H₃SiCOOH), and 1,2‐Disila Acetaldehyde (HSiOSiH₃)

Sankhabrata Chandra, André K. Eckhardt, Andrew M. Turner, György Tarczay, more

Chemistry – A European Journal > 27 > 15 > 4939 - 4945

The identification of silicon‐substituted, complex organics carrying multiple functional groups by classical infrared spectroscopy is challenging because the group frequencies of functional groups often overlap. Photoionization (PI) reflectron time‐of‐fight mass spectrometry (ReTOF‐MS) in combination with temperature‐programmed desorption (TPD) holds certain advantages because molecules are identified...

article

Directed Gas Phase Formation of Silene (H₂SiCH₂)

Zhenghai Yang, Srinivas Doddipatla, Chao He, Vladislav S. Krasnoukhov, more

Chemistry – A European Journal > 26 > 60 > 13584 - 13589

The silene molecule (H₂SiCH₂; X¹A₁) has been synthesized under single collision conditions via the bimolecular gas phase reaction of ground state methylidyne radicals (CH) with silane (SiH₄). Exploiting crossed molecular beams experiments augmented by high‐level electronic structure calculations, the elementary reaction commenced on the doublet surface through a barrierless insertion of the methylidyne...

article

A Free‐Radical Prompted Barrierless Gas‐Phase Synthesis of Pentacene

Long Zhao, Ralf I. Kaiser, Wenchao Lu, Musahid Ahmed, more

Angewandte Chemie International Edition > 59 > 28 > 11334 - 11338

A representative, low‐temperature gas‐phase reaction mechanism synthesizing polyacenes via ring annulation exemplified by the formation of pentacene (C₂₂H₁₄) along with its benzo[a]tetracene isomer (C₂₂H₁₄) is unraveled by probing the elementary reaction of the 2‐tetracenyl radical (C₁₈H₁₁^.) with vinylacetylene (C₄H₄). The pathway to pentacene—a prototype polyacene and a fundamental molecular building...

article

A Free‐Radical Prompted Barrierless Gas‐Phase Synthesis of Pentacene

Long Zhao, Ralf I. Kaiser, Wenchao Lu, Musahid Ahmed, more

Angewandte Chemie > 132 > 28 > 11430 - 11434

article

A Unified Mechanism on the Formation of Acenes, Helicenes, and Phenacenes in the Gas Phase

Long Zhao, Ralf I. Kaiser, Bo Xu, Utuq Ablikim, more

Angewandte Chemie International Edition > 59 > 10 > 4051 - 4058

A unified low‐temperature reaction mechanism on the formation of acenes, phenacenes, and helicenes—polycyclic aromatic hydrocarbons (PAHs) that are distinct via the linear, zigzag, and ortho‐condensed arrangements of fused benzene rings—is revealed. This mechanism is mediated through a barrierless, vinylacetylene mediated gas‐phase chemistry utilizing tetracene, [4]phenacene, and [4]helicene as benchmarks...

article

A Unified Mechanism on the Formation of Acenes, Helicenes, and Phenacenes in the Gas Phase

Long Zhao, Ralf I. Kaiser, Bo Xu, Utuq Ablikim, more

Angewandte Chemie > 132 > 10 > 4080 - 4087

article

Synthesis of Polycyclic Aromatic Hydrocarbons by Phenyl Addition–Dehydrocyclization: The Third Way

Long Zhao, Matthew B. Prendergast, Ralf I. Kaiser, Bo Xu, more

Angewandte Chemie International Edition > 58 > 48 > 17442 - 17450

Polycyclic aromatic hydrocarbons (PAHs) represent the link between resonance‐stabilized free radicals and carbonaceous nanoparticles generated in incomplete combustion processes and in circumstellar envelopes of carbon rich asymptotic giant branch (AGB) stars. Although these PAHs resemble building blocks of complex carbonaceous nanostructures, their fundamental formation mechanisms have remained elusive...

article

Synthesis of Polycyclic Aromatic Hydrocarbons by Phenyl Addition–Dehydrocyclization: The Third Way

Long Zhao, Matthew B. Prendergast, Ralf I. Kaiser, Bo Xu, more

Angewandte Chemie > 131 > 48 > 17603 - 17611

article

Directed Gas‐Phase Synthesis of Triafulvene under Single‐Collision Conditions

Aaron M. Thomas, Long Zhao, Chao He, Galiya R. Galimova, more

Angewandte Chemie > 131 > 43 > 15634 - 15641

The triafulvene molecule (c‐C₄H₄)—the simplest representative of the fulvene family—has been synthesized for the first time in the gas phase through the reaction of the methylidyne radical (CH) with methylacetylene (CH₃CCH) and allene (H₂CCCH₂) under single‐collision conditions. The experimental and computational data suggest triafulvene is formed by the barrierless cycloaddition of the methylidyne...

article

Back Cover: Directed Gas‐Phase Synthesis of Triafulvene under Single‐Collision Conditions (Angew. Chem. Int. Ed. 43/2019)

Aaron M. Thomas, Long Zhao, Chao He, Galiya R. Galimova, more

Angewandte Chemie International Edition > 58 > 43 > 15554 - 15554

Triafulvene (C₄H₄), the simplest member of the fulvene family, is formed as the nascent product upon reaction of methylidyne radicals (CH) with allene (CH₂CCH₂) and methylacetylene (CH₃CCH). As shown by A. M. Mebel, R. I. Kaiser, and co‐workers in their Research Article on page 15488, the formation of triafulvene is favored due to the cycloaddition of the CH radical to unsaturated C₃H₄ bonds followed...

article

Rücktitelbild: Directed Gas‐Phase Synthesis of Triafulvene under Single‐Collision Conditions (Angew. Chem. 43/2019)

Aaron M. Thomas, Long Zhao, Chao He, Galiya R. Galimova, more

Angewandte Chemie > 131 > 43 > 15700 - 15700

Triafulven (C₄H₄), das einfachste Mitglied der Fulvenfamilie, wird als naszierendes Produkt bei der Reaktion von Methylidin‐Radikalen (CH) mit Allen (CH₂CCH₂) und Methylacetylen (CH₃CCH) gebildet. Wie A. M. Mebel, R. I. Kaiser und Mitarbeiter in ihrem Forschungsartikel auf S. 15634 zeigen, wird die Bildung von Triafulven durch die Cycloaddition des CH‐Radikals an ungesättigte C₃H₄‐Bindungen und die...

article

Directed Gas‐Phase Synthesis of Triafulvene under Single‐Collision Conditions

Aaron M. Thomas, Long Zhao, Chao He, Galiya R. Galimova, more

Angewandte Chemie International Edition > 58 > 43 > 15488 - 15495

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Search results for: I. Kaiser

Ist der Weltraum süß oder sauer?

One Collision—Two Substituents: Gas‐Phase Preparation of Xylenes under Single‐Collision Conditions

One Collision—Two Substituents: Gas‐Phase Preparation of Xylenes under Single‐Collision Conditions

Prebiotic Synthesis and Isomerization in Interstellar Analog Ice: Glycinal, Acetamide, and Their Enol Tautomers

Prebiotic Synthesis and Isomerization in Interstellar Analog Ice: Glycinal, Acetamide, and Their Enol Tautomers

Unconventional Pathway in the Gas‐Phase Synthesis of 9H‐Fluorene (C₁₃H₁₀) via the Radical–Radical Reaction of Benzyl (C₇H₇) with Phenyl (C₆H₅)

Unconventional Pathway in the Gas‐Phase Synthesis of 9H‐Fluorene (C₁₃H₁₀) via the Radical–Radical Reaction of Benzyl (C₇H₇) with Phenyl (C₆H₅)

Gas Phase Preparation of the Elusive Monobridged Ge(μ‐H)GeH Molecule through Nonadiabatic Reaction Dynamics

A Photoionization Study on the Detection of 1‐Sila Glycolaldehyde (HSiOCH₂OH), 2‐Sila Acetic Acid (H₃SiCOOH), and 1,2‐Disila Acetaldehyde (HSiOSiH₃)

Directed Gas Phase Formation of Silene (H₂SiCH₂)

A Free‐Radical Prompted Barrierless Gas‐Phase Synthesis of Pentacene

A Free‐Radical Prompted Barrierless Gas‐Phase Synthesis of Pentacene

A Unified Mechanism on the Formation of Acenes, Helicenes, and Phenacenes in the Gas Phase

A Unified Mechanism on the Formation of Acenes, Helicenes, and Phenacenes in the Gas Phase

Synthesis of Polycyclic Aromatic Hydrocarbons by Phenyl Addition–Dehydrocyclization: The Third Way

Synthesis of Polycyclic Aromatic Hydrocarbons by Phenyl Addition–Dehydrocyclization: The Third Way

Directed Gas‐Phase Synthesis of Triafulvene under Single‐Collision Conditions

Back Cover: Directed Gas‐Phase Synthesis of Triafulvene under Single‐Collision Conditions (Angew. Chem. Int. Ed. 43/2019)

Rücktitelbild: Directed Gas‐Phase Synthesis of Triafulvene under Single‐Collision Conditions (Angew. Chem. 43/2019)

Directed Gas‐Phase Synthesis of Triafulvene under Single‐Collision Conditions

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