Proton Magnetic Resonance and Molecular Motion in Solid Methyl-Piperidines and Piperazines
1977 ◽
Vol 32
(8)
◽
pp. 882-885
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Keyword(s):
H Nmr
◽
Abstract The 1H-NMR spin-lattice relaxation time and lineshape in solid 2-, 3-, and 4-methyl-piperidine, in 2-and N-methyl-piperazine, and in NN′-diinethyl-piperazine has been measured from low temperatures to the melting point. For all cases, the experimental data can be described by classical rotation of the methyl group. Activation energies governing this motion are between 9 and 14 kJ/mole. Second moments are reduced from about 25 G2 to 17 G2. No further line-narrowing was observed.
1992 ◽
Vol 47
(11)
◽
pp. 1115-1118
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1994 ◽
Vol 49
(3)
◽
pp. 465-468
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Keyword(s):
1979 ◽
Vol 34
(3)
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pp. 333-339
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1953 ◽
Vol 218
(1135)
◽
pp. 537-552
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1995 ◽
Vol 50
(6)
◽
pp. 584-588
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Keyword(s):
1954 ◽
Vol 222
(1151)
◽
pp. 526-541
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