Hydrogen bonding in crystalline sugars: a variable-temperature FTIR study on methyl β-D-galactopyranoside

1994 ◽  
Author(s):  
Bert Lutz ◽  
Marjan Olthof ◽  
Hendrik J. Luinge ◽  
John H. van der Maas
Keyword(s):  
Hydrogen Bonding ◽  
Variable Temperature ◽  
Ftir Study ◽  
Crystalline Sugars

Synthesis and variable-temperature FTIR study of five chiral liquid crystals induced by intermolecular hydrogen bonding

1995 ◽  
Vol 19 (6) ◽  
pp. 743-748 ◽  
Author(s):  
Yanqing Tian ◽  
Fengyu Su ◽  
Yingying Zhao ◽  
Xuyang Luo ◽  
Xinyi Tang ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Liquid Crystals ◽  
Variable Temperature ◽  
Intermolecular Hydrogen Bonding ◽  
Ftir Study ◽  
Chiral Liquid Crystals

On hydrogen bonding in 2-amino-3-hydroxymethyl-1,3-propane diol (TRIS) – variable temperature neutron single crystal and DFT study

2007 ◽  
Vol 222 (10) ◽  
Author(s):  
L'ubomír Smrčok ◽  
Paula M. Briggs Piccoli ◽  
A. J. Schultz ◽  
Mariana Sládkovičová ◽  
Pavel Mach
Keyword(s):  
Hydrogen Bonding ◽  
Single Crystal ◽  
Variable Temperature ◽  
Dft Study

Polymorphism and hydrogen bonding in cinchomeronic acid: a variable temperature experimental and computational study

CrystEngComm ◽  
2008 ◽  
Vol 10 (10) ◽  
pp. 1404 ◽  
Author(s):  
Ivana Radosavljevic Evans ◽  
Judith A. K. Howard ◽  
John S. O. Evans ◽  
Stella R. Postlethwaite ◽  
Mark R. Johnson
Keyword(s):  
Hydrogen Bonding ◽  
Computational Study ◽  
Variable Temperature

ChemInform Abstract: Hydrogen-Bonding in Non-Cyclic Vicinal Diols and Their Mono-Methyl Ethers: An FTIR Study

ChemInform ◽  
2010 ◽  
Vol 22 (19) ◽  
pp. no-no
Author(s):  
F. A. J. SINGELENBERG ◽  
J. H. VAN DER MAAS
Keyword(s):  
Hydrogen Bonding ◽  
Ftir Study ◽  
Vicinal Diols

Coordination of Pyridine-Substituted Pyrazoles and Their Influence on the Spin State of Iron(II)

1988 ◽  
Vol 41 (11) ◽  
pp. 1645 ◽  
Author(s):  
KH Sugiyarto ◽  
HA Goodwin
Keyword(s):  
Hydrogen Bonding ◽  
Cooling Rate ◽  
High Spin ◽  
Low Temperatures ◽  
Singlet State ◽  
Variable Temperature ◽  
Spin Transition ◽  
Spectral Studies ◽  
Quintet State ◽  
Substituted Pyrazoles

Iron(II) and nickel(II) [MN6]X2 type complexes have been prepared from 2-(pyrazol-1-yl]pyridine (1pp), 2-(pyrazol-1-yl) imidazoline (pi), 2- (pyrazol-3-yl)pyridine (3pp) and 2,6-bis(pyrazol-3-yl)pyridine ( bpp ). Variable-temperature magnetic and Mossbauer spectral studies establish that [Fe(1pp)3]X2 is low spin and [Fe(pi)3]X2 is high spin over an extended temperature range, while both [Fe(3pp)3]X2 and [Fe( bpp )2]X2 undergo temperature-induced low-spin ↔ high-spin transitions. The nature of the transition depends on the extent of hydration and for salts of both cations the singlet state is generally stabilized as the extent of hydration increases. Hydrogen bonding effects are believed to be responsible for this. For anhydrous [Fe( bpp )2] [BF4]2 the transition is discontinuous and associated with hysteresis with Tc ↓ 173 K for decreasing temperature and Tc ↑ 183 K for increasing temperatures. The transition to the singlet state species is complete at low temperatures provided that the cooling rate is relatively slow. Rapid cooling to 77 K results in the trapping of a fraction of metastable quintet state species. For all other species containing either [Fe(3pp)3]2+ or [Fe( bpp )2]2+ the spin transition is continuous. Spectral data for [NiN6]X2 complexes establish an order of field strengths for the ligands pi < 3pp < 1pp < bpp , which, for the bidentate species only, is consistent with the observed electronic properties of the corresponding [FeN6]X2 complexes.

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