UV-induced single and double hydrogen-atom migrations in 3,6-diimino-1,4-cyclohexadiene-1,4-diamine in a low-temperature argon matrix

2005 ◽  
Vol 409 (1-3) ◽  
pp. 52-56 ◽  
Author(s):  
Kenji Ujike ◽  
Satoshi Kudoh ◽  
Munetaka Nakata
Keyword(s):  
Hydrogen Atom ◽  
Low Temperature ◽  
Argon Matrix ◽  
Double Hydrogen

Hydrogen-Atom Tunneling of 2,5-Dichloro-3,6-dihydroxy-1,4-benzoquinone in a Low-Temperature Argon Matrix Studied by FTIR Spectroscopy

2002 ◽  
Vol 106 (46) ◽  
pp. 11029-11033 ◽  
Author(s):  
Nobuyuki Akai ◽  
Satoshi Kudoh ◽  
Masao Takayanagi ◽  
Munetaka Nakata
Keyword(s):  
Hydrogen Atom ◽  
Low Temperature ◽  
Ftir Spectroscopy ◽  
Argon Matrix

Theoretical and Experimental Studies of Enflurane. Infrared Spectra in Solution, in Low-Temperature Argon Matrix and Blue Shifts Resulting from Dimerization

2007 ◽  
Vol 111 (42) ◽  
pp. 12228-12238 ◽  
Author(s):  
Danuta Michalska ◽  
Dariusz C. Bieńko ◽  
Bogusława Czarnik-Matusewicz ◽  
Maria Wierzejewska ◽  
Camille Sandorfy ◽  
...  
Keyword(s):  
Low Temperature ◽  
Infrared Spectra ◽  
Experimental Studies ◽  
Argon Matrix

Hydrogen-atom tunneling through a very high barrier; spontaneous thiol → thione conversion in thiourea isolated in low-temperature Ar, Ne, H2and D2matrices

2018 ◽  
Vol 20 (20) ◽  
pp. 13994-14002 ◽  
Author(s):  
Hanna Rostkowska ◽  
Leszek Lapinski ◽  
Maciej J. Nowak
Keyword(s):  
Hydrogen Atom ◽  
Low Temperature ◽  
Chemical Bond ◽  
Very High

Hydrogen-atom tunneling in thiourea involves breaking of the S–H chemical bond and the formation of a new N–H bond.

Structure of Cerebrosides. II. Small Angle X-Ray Diffraction Study of Cerasine

1979 ◽  
Vol 34 (12) ◽  
pp. 1121-1124 ◽  
Author(s):  
R. Hosemann ◽  
J. Loboda-Čačković ◽  
H. Čačković ◽  
S. Fernandez-Bermúdez ◽  
F. J. Baltá-Calleja
Keyword(s):  
Molecular Weight ◽  
Fatty Acid ◽  
Hydrogen Atom ◽  
Low Temperature ◽  
Hydroxyl Group ◽  
X Ray Diffraction ◽  
Orientational Disorder ◽  
X Ray ◽  
Long Period ◽  
Lattice Planes

Cerasine having a molecular weight of 800 differs chemically from phrenosine only in the hydroxyl group attached to the fatty acid tail which is replaced by a hydrogen atom. Nevertheless, remarkable differences between both cerebrosides are detected in the lamellae periodicities. In the range of 23 - 66 °C just one single (instead of two) structure with a similar subcell to the triclinic one component of phrenosine is detected. Between 66 and 87 °C three new components (instead of one in phrenosine) appear. Two of the structures are similar to the two phrenosine-components at low temperature and the tilt angles of their chains with respect to the basal planes can explain the stabilizing capacity of the 201 and 301 netplanes of the paraffin-like subcells respectively. These lattice planes are parallely aligned to the surfaces of the lamellae. The long period of 58 Å of component II cannot be explained in such a wav. This period persits upto 105 °C and coexists from 87 °C with a new component showing a 40 Å-periodicity, which cannot either be explained in the above manner. Paracrystalline distortions of the arrangement of the bilayers can be justified by orientational disorder of the galactose heads.

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