Microsolvation of ethyl carbamate conformers: effect of carrier gas on the formation of complexes

2020 ◽  
Vol 22 (33) ◽  
pp. 18351-18360
Author(s):  
Pablo Pinacho ◽  
Juan Carlos López ◽  
Zbigniew Kisiel ◽  
Susana Blanco
Keyword(s):  
High Resolution ◽  
Ethyl Carbamate ◽  
Microwave Spectroscopy ◽  
Water Molecules ◽  
Supersonic Expansion ◽  
Carrier Gas ◽  
Formation Of Complexes

Microsolvated complexes of ethyl carbamate (urethane) with up to three water molecules formed in a supersonic expansion have been characterized by high-resolution microwave spectroscopy.

scholarly journals Prospects for high-resolution microwave spectroscopy of methanol in a Stark-deflected molecular beam

2013 ◽  
Vol 111 (12-13) ◽  
pp. 1923-1930 ◽  
Author(s):  
Paul Jansen ◽  
Isabelle Kleiner ◽  
Congsen Meng ◽  
Ronald M. Lees ◽  
Maurice H.M. Janssen ◽  
...  
Keyword(s):  
High Resolution ◽  
Molecular Beam ◽  
Microwave Spectroscopy

scholarly journals Ice XIX: The second hydrogen-ordered polymorph related to ice VI

2020 ◽  
Author(s):  
Tobias Gasser ◽  
Alexander Thoeny ◽  
Andrew Fortes ◽  
Thomas Loerting
Keyword(s):  
High Resolution ◽  
Ambient Pressure ◽  
Structural Models ◽  
Neutron Powder Diffraction ◽  
Ex Situ ◽  
Water Molecules ◽  
Powder Diffraction Data ◽  
Space Groups ◽  
First Order ◽  
Neutron Powder Diffraction Data

Abstract We here report ex situ calorimetry and high-resolution neutron powder diffraction data of a novel ice polymorph produced at 1.8 GPa and recovered to ambient pressure at 80 K. Ice XIX, previously called ice β-XV by us, is shown to be partially hydrogen-ordered and crystallising in a √2 x √2 × 1 supercell with respect to the parent ice VI phase. Our powder data match two nearly degenerate structural models in space-groups \(P\stackrel{-}{4}\) and Pcc2, in which the water molecules are partially antiferroelectrically ordered. Key to the synthesis of deuterated ice XIX is the use of DCl as dopant and the use of a D2O/H2O mixture, where the small H2O fraction nucleates ice XIX. This provides the basis to study the first order-order transition known in ice physics, from ice XIX to its sibling ice XV at ambient pressure. It proceeds via a transition state, ice VI‡, which contains a disordered H-sublattice, whereas both ice XIX and ice XV are fully crystalline.

scholarly journals Microsolvated complexes of ibuprofen as revealed by high-resolution rotational spectroscopy

2018 ◽  
Vol 20 (23) ◽  
pp. 15635-15640 ◽  
Author(s):  
P. Pinacho ◽  
A. Krin ◽  
C. Pérez ◽  
S. Zinn ◽  
J. C. López ◽  
...  
Keyword(s):  
High Resolution ◽  
Microwave Spectroscopy ◽  
Rotational Spectroscopy

Four conformers of microsolvated ibuprofen have been characterized using high-resolution microwave spectroscopy.

Methane as Carrier Gas for Molecular Beam Microwave Spectroscopy to Observe Transitions of Higher Rotational Energy Levels

1996 ◽  
Vol 51 (10-11) ◽  
pp. 1091-1095 ◽  
Author(s):  
F. Lorenzo ◽  
J.-U. Grabow ◽  
H. Dreizler
Keyword(s):  
Molecular Beam ◽  
Energy Levels ◽  
Rotational Energy ◽  
Microwave Spectroscopy ◽  
Rotational Spectroscopy ◽  
Rare Gases ◽  
Carrier Gas

Abstract We report on an observation in molecular beam rotational spectroscopy: using Methane rather than rare gases as carrier extends the range of observable transitions towards levels of higher rotational energy.

Complexation of the La(III) cation by p-sulfonatocalix[4]arene — A 139La NMR study

2002 ◽  
Vol 80 (2) ◽  
pp. 163-168 ◽  
Author(s):  
Yaël Israëli ◽  
Christine Bonal ◽  
Christian Detellier ◽  
Jean-Pierre Morel ◽  
Nicole Morel-Desrosiers
Keyword(s):  
Linear Relationship ◽  
Standard Enthalpy ◽  
Effective Radius ◽  
Water Soluble ◽  
Water Molecules ◽  
Standard Entropy ◽  
Nmr Data ◽  
Nmr Study ◽  
Good Agreement ◽  
Formation Of Complexes

The complexation of La(III) by the water-soluble p-sulfonatocalix[4]arene was thermodynamically characterized by 139La NMR. The 139La NMR data are consistent with the formation of a 1:1 complex resulting from electro static interactions between the sulfonato groups and La(III). The complexation is entropy-driven and is characterized by a positive standard enthalpy (ΔrH° = 11.0 ± 0.5 kJ mol–1) and a positive standard entropy (ΔrS° = 108 ± 2 J K–1 mol–1), which are in very good agreement with the ones determined previously by microcalorimetry. The linear relationship between the 139La NMR linewidth of the free and of the complexed cation, obtained at temperatures ranging from 290 to 340 K, excludes the formation of complexes or aggregates other than the 1:1 complex. It shows also that upon complexation, the effective radius of La(III) undergoes an increase of 50%, related to the replacement of water molecules of the hydrated cation by sulfonato groups of the ligand.Key words: complexation, water-soluble calixarene, p-sulfonatocalix[4]arene, 139La NMR, lanthanum.

scholarly journals Bolometric technique for high-resolution broadband microwave spectroscopy of ultra-low-loss samples

2004 ◽  
Vol 75 (1) ◽  
pp. 124-135 ◽  
Author(s):  
P. J. Turner ◽  
D. M. Broun ◽  
Saeid Kamal ◽  
M. E. Hayden ◽  
J. S. Bobowski ◽  
...  
Keyword(s):  
High Resolution ◽  
Microwave Spectroscopy ◽  
Low Loss
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