Cooperative Enhancement of Water Binding to Crownophane by Multiple Hydrogen Bonds:  Analysis by High Level ab Initio Calculations

2001 ◽  
Vol 123 (18) ◽  
pp. 4255-4258 ◽  
Author(s):  
Seiji Tsuzuki ◽  
Hirohiko Houjou ◽  
Yoshinobu Nagawa ◽  
Midori Goto ◽  
Kazuhisa Hiratani
Keyword(s):  
Hydrogen Bonds ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Water Binding ◽  
High Level ◽  
Multiple Hydrogen Bonds

Configurational Assignment and Conformational Study of Methylglyoxal Bisdimethylhydrazones Derived from the 2-Ethoxypropenal Precursor

2006 ◽  
Vol 59 (3) ◽  
pp. 211 ◽  
Author(s):  
Leonid B. Krivdin ◽  
Lyudmila I. Larina ◽  
Kirill A. Chernyshev ◽  
Natalia A. Keiko
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Experimental Measurements ◽  
Conformational Study ◽  
Lone Pairs ◽  
Configurational Assignment ◽  
Out Of Plane ◽  
High Level

A configurational assignment of the isomeric methylglyoxal bisdimethylhydrazones derived from the 2-ethoxypropenal precursor has been performed based on experimental measurements and high-level ab initio calculations of 1J(C,C) and 1J(C,H) couplings. The results reveal the marked stereochemical dependence upon the orientation of the lone pairs of both nitrogen atoms in different isomers. Methylglyoxal bisdimethylhydrazone is shown to exist in a mixture of the EE and ZE isomers (ca. 75:25), both of which adopt predominant s-trans conformations with minor (up to 8°) out-of-plane deviations.

Excitons in poly(para phenylene vinylene): a quantum-chemical perspective based on high-level ab initio calculations

2016 ◽  
Vol 18 (4) ◽  
pp. 2548-2563 ◽  
Author(s):  
Stefanie A. Mewes ◽  
Jan-Michael Mewes ◽  
Andreas Dreuw ◽  
Felix Plasser
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Quantum Chemical ◽  
Phenylene Vinylene ◽  
High Level ◽  
Quantum Chemical Computations

Exciton analyses of high-level quantum-chemical computations for poly(paraphenylene vinylene) reveal the nature of the excitonic bands in PPV oligomers.

Competition and conversion between pnicogen bonds and hydrogen bonds involving prototype organophosphorus compounds

2021 ◽  
Author(s):  
Xinyue Jing ◽  
Yanli Zeng ◽  
Xueying Zhang ◽  
Lingpeng Meng ◽  
Xiaoyan Li
Keyword(s):  
Hydrogen Bonds ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Organophosphorus Compounds ◽  
Pnicogen Bonds

Ab initio calculations have been performed to investigate the competition and conversion between the pnicogen bonds and hydrogen bonds in the complexes containing prototype organophosphorus compounds RPO2 (R = CH3...

scholarly journals Exploration of the NH3–H2 van der Waals interaction by high level ab initio calculations

2008 ◽  
Vol 346 (1-3) ◽  
pp. 237-246 ◽  
Author(s):  
Mirjana Mladenović ◽  
Marius Lewerenz ◽  
Geraldine Cilpa ◽  
Pavel Rosmus ◽  
Gilberte Chambaud
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Van Der Waals ◽  
Van Der Waals Interaction ◽  
High Level
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