ChemInform Abstract: FAR-INFRARED RELAXATION IN THE ISOLATED FORMIC ACID DIMER MOLECULE, POSSIBILITY OF FAST PROTON TUNNELING IN A HYDROGEN BOND

1975 ◽  
Vol 6 (3) ◽  
Author(s):  
WALTER G. ROTHSCHILD
Keyword(s):  
Hydrogen Bond ◽  
Formic Acid ◽  
Far Infrared ◽  
Fast Proton ◽  
Proton Tunneling

Far Infrared Group Frequencies. V. Oximes and Aldoximes

1973 ◽  
Vol 27 (1) ◽  
pp. 22-26 ◽  
Author(s):  
S. M. Craven ◽  
F. F. Bentley ◽  
D. F. Pensenstadler
Keyword(s):  
Hydrogen Bond ◽  
Infrared Spectra ◽  
Low Frequency ◽  
Far Infrared ◽  
Torsional Vibrations ◽  
Lattice Vibrations ◽  
Dilute Solutions ◽  
Solid Samples ◽  
Bending Modes ◽  
Bond Stretch

The low frequency infrared spectra from 450 to 75 cm−1 of seven oximes and five aldoximes have been recorded for pure samples and for dilute solutions in cyclohexane. An intense characteristic band is present in the solution spectra at 367 ± 10 cm−1. This characteristic band shifts to 275 ± 10 cm−1 in the spectra of the OD compounds. The 367 ± 10 cm−1 and 275 ± 10 cm−1 bands are assigned to OH and OD torsional vibrations. A comparison of the solution spectra with spectra of the solid samples indicated that the OH … N hydrogen bond stretch of oximes and aldoximes occurs in 300 to 200 cm−1 region. Strong bands also are present in 140 to 100 cm−1 region which are due to OH … N bending modes or perhaps lattice vibrations.

Proton tunneling and local symmetry of the hydrogen bond in Rb3H(SO4)2

1996 ◽  
Vol 226 (1-3) ◽  
pp. 157-160 ◽  
Author(s):  
Sadamu Takeda ◽  
Fumitaka Kondoh ◽  
Nobuo Nakamura ◽  
Kizashi Yamaguchi
Keyword(s):  
Hydrogen Bond ◽  
Local Symmetry ◽  
Proton Tunneling

Synthesis and Characterization of Gold(III) Halide Complexes of Quinaldic Acid (Hqd), Methyl Quinaldate and Ethyl Quinaldate, and X-Ray Structure of [(HQd)2H] [AuBr4].H2O

1994 ◽  
Vol 47 (7) ◽  
pp. 1423 ◽  
Author(s):  
MAS Goher ◽  
AK Hafez ◽  
RJ Wang ◽  
XM Chen ◽  
TCW Mak
Keyword(s):  
Hydrogen Bond ◽  
Far Infrared ◽  
Synthesis And Characterization ◽  
Coordination Environment ◽  
X Ray ◽  
Quinaldic Acid ◽  
Halide Complexes ◽  
Monodentate Ligands ◽  
Far Infrared Spectra

Complexes of the types HAuX4.2HQd, where X = Cl or Br and HQd = quinaldic acid, and AuX3L2, where L is methyl or ethyl quinaldate , have been prepared and characterized. Quinaldic acid as well as methyl and ethyl quinaldates function as monodentate ligands in these complexes, whose stereochemistries are discussed in relation to the number of gold-halogen stretching frequencies observed in their far-infrared spectra. The measured conductivities of these complexes are also discussed. Single-crystal X-ray analysis of monohydrated HAuBr4.2HQd revealed that it should be formulated as [( HQd )2H][AuBr4].H2O, in which a pair of zwitterionic HQd moieties are connected by a strong O...H...O hydrogen bond, and the gold(III) atom is in an elongated octahedral coordination environment with two long Au-O bonds of 3.388(8) and 3.440(8)Ǻ.

Fourier transform far-infrared spectroscopy of the hydrogen bond in 4-n-alkoxybenzoic acids

1995 ◽  
Vol 8 (2) ◽  
pp. 193-198 ◽  
Author(s):  
K. Antonova ◽  
M. Petrov ◽  
N. Kirov ◽  
T. Tenev ◽  
H. Ratajczak
Keyword(s):  
Hydrogen Bond ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Far Infrared ◽  
Far Infrared Spectroscopy

An experimental study of a CW optically pumped far infrared formic acid vapour laser

1988 ◽  
Vol 28 (1) ◽  
pp. 7-20 ◽  
Author(s):  
L.B. Whitbourn ◽  
J.C. Macfarlane ◽  
P.A. Stimson ◽  
B.W. James ◽  
I.S. Falconer
Keyword(s):  
Experimental Study ◽  
Formic Acid ◽  
Far Infrared ◽  
Optically Pumped

The far infrared spectrum of trans-formic acid: An extension up to 175cm−1

2012 ◽  
Vol 113 (11) ◽  
pp. 1134-1137 ◽  
Author(s):  
Adriana Predoi−Cross ◽  
Michel Herman ◽  
Luciano Fusina ◽  
Gianfranco Di Lonardo
Keyword(s):  
Infrared Spectrum ◽  
Formic Acid ◽  
Far Infrared

scholarly journals A theoretical study on the red- and blue-shift hydrogen bonds of cis-trans formic acid dimer in excited states

2013 ◽  
Vol 11 (2) ◽  
pp. 171-179 ◽  
Author(s):  
Dapeng Yang ◽  
Yonggang Yang ◽  
Yufang Liu
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonds ◽  
Formic Acid ◽  
Excited States ◽  
Density Functional ◽  
Blue Shift ◽  
Red Shift ◽  
Functional Theory ◽  
Photophysical Study ◽  
Tddft Method

AbstractThe excited states of cis-trans formic acid dimer and its monomers have been investigated by time-dependent density functional theory (TDDFT) method. The formation of intermolecular hydrogen bonds O1-H1...O2=C2 and C2-H2...O4=C1 induces bond length lengthening of the groups related to the hydrogen bond, while that of the C2-H2 group is shortened. It is demonstrated that the red-shift hydrogen bond O1-H1...O2=C2 and blue-shift hydrogen bond C2-H2...O4=C1 are both weakened when excited to the S1 state. Moreover, it is found that the groups related to the formation of red-shift hydrogen bond O1-H1...O2=C2 are both strengthened in the S1 state, while the groups related to the blue-shift hydrogen bond C2-H2...O4=C1 are both weakened. This will provide information for the photochemistry and photophysical study of red- and blue-shift hydrogen bond.

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