Molecular motion in solid π–π molecular complexes. Part 3.—Pulse n.m.r. measurements on solid charge-transfer complexes of naphthalene and pyrene

1976 ◽  
Vol 72 (0) ◽  
pp. 2269-2282 ◽  
Author(s):  
Colin A. Fyfe ◽  
Duane Harold-Smith ◽  
John Ripmeester
Keyword(s):  
Charge Transfer ◽  
Molecular Motion ◽  
Molecular Complexes ◽  
Charge Transfer Complexes

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.

MOLECULAR MOTION IN WEAK CHARGE TRANSFER COMPLEXES

1966 ◽  
Vol 44 (8) ◽  
pp. 945-952 ◽  
Author(s):  
D. F. R. Gilson ◽  
C. A. McDowell
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Charge Transfer ◽  
Molecular Motion ◽  
Charge Transfer Complexes ◽  
Weak Charge ◽  
Magnetic Resonance Studies ◽  
Second Moments ◽  
Line Nuclear Magnetic Resonance ◽  
Pure Compounds ◽  
Wide Line

"Wide line" nuclear magnetic resonance studies of several charge transfer complexes are reported. Line width transitions and comparisons of theoretical and experimental second moments indicate that molecular rotation occurs in several of these complexes. Estimates of the barriers to reorientation in the complexes show these to be lower than those observed for the corresponding pure compounds.

Sign in / Sign up

Export Citation Format

Share Document