Results 21 to 30 of about 618 (167)
The Silacyclobutene Ring: An Indicator of Triplet State Baird-Aromaticity
Inorganics, 2017 Baird’s rule tells that the electron counts for aromaticity and antiaromaticity in the first ππ* triplet and singlet excited states (T1 and S1) are opposite to those in the ground state (S0). Our hypothesis is that a silacyclobutene (SCB) ring fused with
Rabia Ayub +2 more
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Antiaromaticity in molecular assemblies and materials. [PDF]
Chem SciAntiaromatic rings can be assembled into discrete or polymeric assemblies to explore emerging properties. This perspective compares antiaromatic rings as potential building blocks and covers reported antiaromatic ring assemblies.
Lavendomme R, Yamashina M.
europepmc +4 more sources
The symmetry principle of antiaromaticity [PDF]
Zeitschrift für Naturforschung B, 2020 Abstract Current definitions of aromaticity are purely phenomenological and relate symmetry, reactive stability and the occurrence of molecular diamagnetic response currents. The antithetical concept of antiaromaticity provides a connection between the contrary properties: structural instability or distortion out of higher symmetry, a ...
Berger, Raphael J. F., Viel, Alexandre
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Advanced Science, 2020 Although polycyclic conjugated hydrocarbons (PCHs) and their analogues have gained great progress in the fields of organic photoelectronic materials, the in‐depth study on present PCHs is still limited to hexacene or below because longer PCHs are ...
Wangqiao Chen +4 more
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Dihydrogen Activation by Antiaromatic Pentaarylboroles [PDF]
Journal of the American Chemical Society, 2010 Facile metal-free splitting of molecular hydrogen (H(2)) is crucial for the utilization of H(2) without the need for toxic transition-metal-based catalysts. Frustrated Lewis pairs (FLPs) are a new class of hydrogen activators wherein interactions with both a Lewis acid and a Lewis base heterolytically disrupt the hydrogen-hydrogen bond.
Fan, Cheng +4 more
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Aromatic, or Antiaromatic, That Is the Question: [PDF]
, 2021 The term aromaticity in chemistry is reminiscent of symmetric, stable structures that have delocalized electrons and sustain diamagnetic ring currents in the presence of external magnetic fields. The two latter characteristics sometimes mistakenly are thought to be the same.
Ben Joseph R Cuyacot +1 more
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Divergent Synthesis of Möbius and Hückel N‐Heterocycloarenes From a Common Macrocyclic Backbone
Angewandte Chemie, EarlyView.In the divergent synthesis of Möbius and Hückel N‐heterocycloarenes from a common macrocyclic precursor, the annulation reaction dictates topology: Scholl reaction gives Möbius topology, while InCl3‐mediated alkyne annulation gives Hückel topology. The Möbius N‐heterocycloarene is unevenly contorted as revealed by crystal structure, and the Hückel N ...
Han Chen +6 more
wiley +2 more sources
Aromaticity of Heterocirculenes
Chemistry, 2021 This review summarizes the results on the aromaticity of a series of synthesized and hypothetical neutral heterocirculene molecules and their double charged ions.
Nataliya N. Karaush-Karmazin +2 more
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An antiaromatic-walled nanospace
Nature, 2019 Over the past few decades, several molecular cages, hosts and nanoporous materials enclosing nanometre-sized cavities have been reported1-5, including coordination-driven nanocages6. Such nanocages have found widespread use in molecular recognition, separation, stabilization and the promotion of unusual chemical reactions, among other applications3-10.
Yamashina, Masahiro +5 more
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Angewandte Chemie, EarlyView.We demonstrate the facile aromatic C─C bond cleavage of cyclopentadienide mediated by transient imino(metallophosphino)silylenes, enabling the transformation of an aromatic system into a homoaromatic species. The steric bulk of the phosphino substituent, together with the weak interaction between the coinage metal and the cyclopentadienide ligand, are ...
Huaiyuan Zhu +4 more
wiley +2 more sources