ChemInform Abstract: STUDIES OF HIGHLY STRAINED HETEROCYCLES. 4. THE REACTIONS OF 1,2-DIPHENYL-1-AZASPIRO(2.2)PENTANE AND 2-PHENYL-1-AZASPIRO(2.2)PENT-1-ENE WITH C,N-DIARYLNITRILIMINES

1980 ◽  
Vol 11 (14) ◽  
Author(s):  
O. TSUGE ◽  
H. WATANABE ◽  
Y. KIRYU
Keyword(s):  
Strained Heterocycles ◽  
Highly Strained

scholarly journals Highly Strained Heterocycles Constructed from Boron-Boron Multiple Bonds and Heavy Chalcogens

2016 ◽  
Vol 55 (18) ◽  
pp. 5606-5609 ◽  
Author(s):  
Holger Braunschweig ◽  
Philipp Constantinidis ◽  
Theresa Dellermann ◽  
William C. Ewing ◽  
Ingo Fischer ◽  
...  
Keyword(s):  
Multiple Bonds ◽  
Strained Heterocycles ◽  
Highly Strained

Symmetry Breaking and the Turn-On Fluorescence of Small, Highly Strained Carbon Nanohoops

2019 ◽  
Author(s):  
Terri Lovell ◽  
Curtis Colwell ◽  
Lev N. Zakharov ◽  
Ramesh Jasti
Keyword(s):  
Symmetry Breaking ◽  
Theoretical Work ◽  
P Systems ◽  
Quantum Yields ◽  
Size Dependent ◽  
New Class ◽  
Carbon Carbon Bond ◽  
Conjugated Macrocycles ◽  
Structural Manipulation ◽  
Highly Strained

<p>[<i>n</i>]Cycloparaphenylenes, or “carbon nanohoops,” are unique conjugated macrocycles with radially oriented p-systems similar to those in carbon nanotubes. The centrosymmetric nature and conformational rigidity of these molecules lead to unusual size-dependent photophysical characteristics. To investigate these effects further and expand the family of possible structures, a new class of related carbon nanohoops with broken symmetry is disclosed. In these structures, referred to as <i>meta</i>[<i>n</i>]cycloparaphenylenes, a single carbon-carbon bond is shifted by one position in order to break the centrosymmetric nature of the parent [<i>n</i>]cycloparaphenylenes. Advantageously, the symmetry breaking leads to bright emission in the smaller nanohoops, which are typically non-fluorescent due to optical selection rules. Moreover, this simple structural manipulation retains one of the most unique features of the nanohoop structures-size dependent emissive properties with relatively large extinction coefficents and quantum yields. Inspired by earlier theoretical work by Tretiak and co-workers, this joint synthetic, photophysical, and theoretical study provides further design principles to manipulate the optical properties of this growing class of molecules with radially oriented p-systems.</p>

Symmetry Breaking and the Turn-On Fluorescence of Small, Highly Strained Carbon Nanohoops

2019 ◽  
Author(s):  
Terri Lovell ◽  
Curtis Colwell ◽  
Lev N. Zakharov ◽  
Ramesh Jasti
Keyword(s):  
Symmetry Breaking ◽  
Theoretical Work ◽  
P Systems ◽  
Quantum Yields ◽  
Size Dependent ◽  
New Class ◽  
Carbon Carbon Bond ◽  
Conjugated Macrocycles ◽  
Structural Manipulation ◽  
Highly Strained

<p>[<i>n</i>]Cycloparaphenylenes, or “carbon nanohoops,” are unique conjugated macrocycles with radially oriented p-systems similar to those in carbon nanotubes. The centrosymmetric nature and conformational rigidity of these molecules lead to unusual size-dependent photophysical characteristics. To investigate these effects further and expand the family of possible structures, a new class of related carbon nanohoops with broken symmetry is disclosed. In these structures, referred to as <i>meta</i>[<i>n</i>]cycloparaphenylenes, a single carbon-carbon bond is shifted by one position in order to break the centrosymmetric nature of the parent [<i>n</i>]cycloparaphenylenes. Advantageously, the symmetry breaking leads to bright emission in the smaller nanohoops, which are typically non-fluorescent due to optical selection rules. Moreover, this simple structural manipulation retains one of the most unique features of the nanohoop structures-size dependent emissive properties with relatively large extinction coefficents and quantum yields. Inspired by earlier theoretical work by Tretiak and co-workers, this joint synthetic, photophysical, and theoretical study provides further design principles to manipulate the optical properties of this growing class of molecules with radially oriented p-systems.</p>

scholarly journals Indirect light absorption model for highly strained silicon infrared sensors

2021 ◽  
Vol 130 (5) ◽  
pp. 055105
Author(s):  
Nicolas Roisin ◽  
Guillaume Brunin ◽  
Gian-Marco Rignanese ◽  
Denis Flandre ◽  
Jean-Pierre Raskin
Keyword(s):  
Light Absorption ◽  
Strained Silicon ◽  
Absorption Model ◽  
Infrared Sensors ◽  
Highly Strained

Void-Enriched and Highly Strained Porous Au–Ag Nanoalloy as a Bifunctional Electro-Catalyst in Alkaline Direct Alcohol Fuel Cell

2021 ◽  
Author(s):  
Sandip Kumar De ◽  
Arpita Nandy ◽  
Subrata Mondal ◽  
Anuradha Roy ◽  
Sourav Mondal ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Direct Alcohol Fuel Cell ◽  
Alcohol Fuel ◽  
Highly Strained
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