A strong asymmetric N–H–N hydrogen bond: Neutron diffraction and IR spectroscopic studies of 4‐aminopyridine hemiperchlorate

1980 ◽  
Vol 72 (11) ◽  
pp. 6117-6122 ◽  
Author(s):  
J. Rozière ◽  
Jack M. Williams ◽  
E. Grech ◽  
Z. Malarski ◽  
L. Sobcyzk
Keyword(s):  
Hydrogen Bond ◽  
Neutron Diffraction ◽  
Spectroscopic Studies ◽  
Ir Spectroscopic

Investigation of hydrogen-bond network in bis(glycinium) oxalate using single-crystal neutron diffraction and spectroscopic studies

2007 ◽  
Vol 63 (3) ◽  
pp. 497-504 ◽  
Author(s):  
R. Chitra ◽  
R. R Choudhury
Keyword(s):  
Hydrogen Bond ◽  
Neutron Diffraction ◽  
Single Crystal ◽  
Spectroscopic Studies ◽  
X Ray Diffraction ◽  
X Ray ◽  
Potential Energy Landscape ◽  
Short Hydrogen Bond ◽  
Bond Network ◽  
Ir And Raman

Single-crystal neutron diffraction investigation of bis(glycinium) oxalate was undertaken in order to study its hydrogen-bonding network, particularly the very short hydrogen bond between the glycinum and oxalate ions, indicated by the X-ray diffraction study. The non-existence of any phase transition in these crystals was attributed to the fact that the short hydrogen bond in bis(glycinium) oxalate is asymmetric in nature, with no hydrogen disorder. The potential energy landscape for the above-mentioned H atom was found to have a single minimum closer to the glycinium ion. IR and Raman investigations of the title complex supported the above result.

Gas Cell Infrared and Attenuated Total Reflection Infrared Spectroscopic Studies for Organic–Inorganic Interactions in Adsorption of Fulvic Acid on the Goethite Surface Generating Carbon Dioxide

2021 ◽  
pp. 000370282199121
Author(s):  
Yuki Nakaya ◽  
Satoru Nakashima ◽  
Takahiro Otsuka
Keyword(s):  
Carbon Dioxide ◽  
Activation Energy ◽  
Fulvic Acid ◽  
Spectroscopic Studies ◽  
Reaction Model ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Gas Cell ◽  
Rate Determining Step ◽  
Ir Spectroscopic

The generation of carbon dioxide (CO2) from Nordic fulvic acid (FA) solution in the presence of goethite (α-FeOOH) was observed in FA–goethite interaction experiments at 25–80 ℃. CO2 generation processes observed by gas cell infrared (IR) spectroscopy indicated two steps: the zeroth order slower CO2 generation from FA solution commonly occurring in the heating experiments of the FA in the presence and absence of goethite (activation energy: 16–19 kJ mol–1), and the first order faster CO2 generation from FA solution with goethite (activation energy: 14 kJ mol–1). This CO2 generation from FA is possibly related to redox reactions between FA and goethite. In situ attenuated total reflection infrared (ATR-IR) spectroscopic measurements indicated rapid increases with time in IR bands due to COOH and COO– of FA on the goethite surface. These are considered to be due to adsorption of FA on the goethite surface possibly driven by electrostatic attraction between the positively charged goethite surface and negatively charged deprotonated carboxylates (COO–) in FA. Changes in concentration of the FA adsorbed on the goethite surface were well reproduced by the second order reaction model giving an activation energy around 13 kJ mol–1. This process was faster than the CO2 generation and was not its rate-determining step. The CO2 generation from FA solution with goethite is faster than the experimental thermal decoloration of stable structures of Nordic FA in our previous report possibly due to partial degradations of redox-sensitive labile structures in FA.

Far-IR spectroscopic studies on zeolite NaCaA

1993 ◽  
Vol 211 (2-3) ◽  
pp. 214-219 ◽  
Author(s):  
R.V. Jasra ◽  
N.V. Choudary ◽  
K.V. Rao ◽  
G.C. Pandey ◽  
S.G.T. Bhat
Keyword(s):  
Spectroscopic Studies ◽  
Ir Spectroscopic

IR spectroscopic studies of Ru3(CO)12 interaction with disperse metallic palladium supported on SiO2

1984 ◽  
Vol 26 (1-2) ◽  
pp. 79-84 ◽  
Author(s):  
Yu. A. Ryndin ◽  
L. V. Gorodova ◽  
O. V. Tyunina ◽  
A. A. Davydov ◽  
Yu. I. Yermakov
Keyword(s):  
Spectroscopic Studies ◽  
Metallic Palladium ◽  
Ir Spectroscopic
Sign in / Sign up

Export Citation Format

Share Document