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.

Molecular motion in solid complexes of trimethylamine with boron trihalides and borane

1970 ◽  
Vol 48 (4) ◽  
pp. 515-521 ◽  
Author(s):  
C. T. Yim ◽  
D. F. R. Gilson
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Boron Trifluoride ◽  
Molecular Motion ◽  
Methyl Groups ◽  
Magnetic Resonance Studies ◽  
Line Nuclear Magnetic Resonance ◽  
Wide Line ◽  
Solid Phases ◽  
Solid Complexes

Wide line nuclear magnetic resonance studies of trimethylamine complexes of BF3, BCl3, BBr3, and BH3 show that rotation of methyl groups and rotation about the B—N axes occur in the solid phases. The complex between ammonia and boron trifluoride has also been studied.

A wide line nuclear magnetic resonance study of molecular motion in pyridinium salts

1970 ◽  
Vol 48 (16) ◽  
pp. 2625-2627 ◽  
Author(s):  
C. H. Matthews ◽  
D. F. R. Gilson
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Molecular Motion ◽  
Nuclear Magnetic Resonance Study ◽  
Pyridinium Salts ◽  
Magnetic Resonance Study ◽  
Line Nuclear Magnetic Resonance ◽  
Pyridinium Ring ◽  
Wide Line ◽  
Nuclear Magnetic

Wide line nuclear magnetic resonance studies of pyridinium hexafluorophosphate, chloride, and nitrate show line width and second moment transitions which are attributed to reorientational motions of the pyridinium ring. The differences in transition temperatures are due to the different hydrogen bonded structures in the three salts.

Nuclear magnetic resonance studies of solid methylammonium halides

1970 ◽  
Vol 48 (5) ◽  
pp. 717-722 ◽  
Author(s):  
J. Tsau ◽  
D. F. R. Gilson
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Line Width ◽  
Molecular Reorientation ◽  
Magnetic Resonance Studies ◽  
Second Moment ◽  
Line Nuclear Magnetic Resonance ◽  
Methylammonium Chloride ◽  
Wide Line ◽  
Nuclear Magnetic

Wide-line nuclear magnetic resonance studies of methylammonium chloride, bromide, and iodide and their partially deuterated analogues show that second-moment and line-width transitions occur which can be interpreted as due to molecular reorientation about the C—N axes. In the bromide and iodide salts this motion persists below 77 °K.

Broad-line nuclear magnetic resonance investigation of molecular motion in solid trimethylamine–halogen complexes

1970 ◽  
Vol 48 (14) ◽  
pp. 2283-2289 ◽  
Author(s):  
C. A. Fyfe ◽  
J. Ripmeester
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Molecular Motion ◽  
Charge Transfer Complexes ◽  
Broad Line ◽  
Iodine Monochloride ◽  
Nuclear Magnetic Resonance Investigation ◽  
Line Nuclear Magnetic Resonance ◽  
Magnetic Resonance Investigation ◽  
Nuclear Magnetic

Broad-line nuclear magnetic resonance studies of the charge-transfer complexes of trimethylamine (NMe3) with iodine, bromine, and iodine monochloride indicate the presence of motion in the solid state. Trimethylamine itself was studied for purposes of comparison. The nature of the motional transitions for each species has been determined, and activation energies derived.

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