scholarly journals Molecular Complexes of Cyclophanes. XV. Charge-Transfer Complexes of Sterically Hindered[2.2]metapara- and [2.2]paracyclophanes with π-Acceptors

1989 ◽  
Vol 62 (4) ◽  
pp. 1379-1381 ◽  
Author(s):  
Aboul-fetouh E. Mourad ◽  
Alaa El-Din A. Hassan ◽  
Jörg Dannheim
Keyword(s):  
Charge Transfer ◽  
Molecular Complexes ◽  
Charge Transfer Complexes ◽  
Sterically Hindered

Molecular Complexes of Cyclophanes, Part XVII Charge-Transfer Complexes of [2.2]- and [2.2.2]Paracyclophane-carbamates with π-Acceptors

1987 ◽  
Vol 42 (9) ◽  
pp. 1147-1152 ◽  
Author(s):  
Aboul-fetouh E. Mourad ◽  
Verena Lehne
Keyword(s):  
Charge Transfer ◽  
Functional Group ◽  
Lone Pair ◽  
Molecular Complexes ◽  
Charge Transfer Complexes ◽  
Electronic Interactions ◽  
H Nmr ◽  
Ct Complex ◽  
Nitrogen Lone Pair ◽  
Lone Pair Electrons

Charge-transfer (CT) complexation between some [2.2]- and [2.2.2]paracyclophane-carbamates as donors with 2,3-dichloro-5.6-dicyanobenzoquinone (DDO ) as well as tetracyanoethylene (TCNE) as π-acceptors has been evidenced by VIS. 1H NMR and IR spectroscopy. The site of interaction in the two different donor systems was determined. The results reveal no contribution of the nitrogen lone pair electrons of the carbamate functional group in the CT complexation. and the interaction is mainly of π-π* type. In addition, the existence of the transannular electronic interactions in [2.2]paracyclophane derivatives is responsible for CT complex formation.

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