Bond length alternation in cyclic polyenes. III. Alternant molecular orbital method

1983 ◽  
Vol 24 (4) ◽  
pp. 411-423 ◽  
Author(s):  
R. Pauncz ◽  
J. Paldus
Keyword(s):  
Bond Length ◽  
Molecular Orbital ◽  
Orbital Method ◽  
Molecular Orbital Method ◽  
Bond Length Alternation ◽  
Cyclic Polyenes

Approximate Molecular Orbital Theory: The Hückel/Tight-binding Model

2020 ◽  
pp. 231-245
Author(s):  
Jochen Autschbach
Keyword(s):  
Bond Length ◽  
Molecular Orbital ◽  
Tight Binding ◽  
Molecular Orbital Theory ◽  
Orbital Theory ◽  
Bond Length Alternation ◽  
Binding Model ◽  
Linear Polyenes ◽  
Benzene Structure ◽  
Cyclic Polyenes

Huckel molecular orbital (HMO) theory is a simple approximate parameterized molecular orbital (MO) theory that has been very successful in organic chemistry and other fields. This chapter introduces the approximations made in HMO theory, and then treats as examples ethane, hetratriene and other linear polyenes, and benzene and other cyclic polyenes. The pi binding energy of benzene is particularly large according to HMO theory, rationalizing the special ‘aromatic’ behaviour of benzene. But there is a lot more to benzene than that. It is shown that the pi bond framework of benzene would rather prefer a structure with alternating single and double C-C bonds, rather than the actually observed 6-fold symmetric structure where all C-C bonds are equivalent. The observed benzene structure is a result of a delicate balance between the tendencies of the pi framework to create bond length alternation, and the sigma framework to resist bond length alternation.

Simulations of Chemical Reactions with the Frozen Domain Formulation of the Fragment Molecular Orbital Method

2015 ◽  
Vol 11 (7) ◽  
pp. 3053-3064 ◽  
Author(s):  
Hiroya Nakata ◽  
Dmitri G. Fedorov ◽  
Takeshi Nagata ◽  
Kazuo Kitaura ◽  
Shinichiro Nakamura
Keyword(s):  
Molecular Orbital ◽  
Chemical Reactions ◽  
Orbital Method ◽  
Molecular Orbital Method ◽  
Fragment Molecular Orbital

Extension of the fragment molecular orbital method to treat large open-shell systems in solution

2015 ◽  
Vol 635 ◽  
pp. 86-92 ◽  
Author(s):  
Hiroya Nakata ◽  
Dmitri G. Fedorov ◽  
Kazuo Kitaura ◽  
Shinichiro Nakamura
Keyword(s):  
Molecular Orbital ◽  
Open Shell ◽  
Orbital Method ◽  
Molecular Orbital Method ◽  
Fragment Molecular Orbital

scholarly journals Molecular Interactions between Estrogen Receptor and Its Ligand Studied by the ab Initio Fragment Molecular Orbital Method

2006 ◽  
Vol 110 (47) ◽  
pp. 24276-24276 ◽  
Author(s):  
Kaori Fukuzawa ◽  
Yuji Mochizuki ◽  
Shigenori Tanaka ◽  
Kazuo Kitaura ◽  
Tatsuya Nakano
Keyword(s):  
Estrogen Receptor ◽  
Ab Initio ◽  
Molecular Orbital ◽  
Molecular Interactions ◽  
Orbital Method ◽  
Molecular Orbital Method ◽  
Fragment Molecular Orbital
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