Diffusion of cyclohexane and cyclopentane derivatives in some polar and non-polar solvents. Effect of intermolecular and intramolecular hydrogen-bonding interactions

1996 ◽  
Vol 92 (11) ◽  
pp. 1863 ◽  
Author(s):  
Toshihiro Tominaga ◽  
Shoji Tenma ◽  
Hiroshi Watanabe
Keyword(s):  
Hydrogen Bonding ◽  
Intramolecular Hydrogen Bonding ◽  
Polar Solvents ◽  
Hydrogen Bonding Interactions ◽  
Intramolecular Hydrogen

scholarly journals Intramolecular hydrogen bonding in conformationally semi-rigid α-acylmethane derivatives: a theoretical NMR study

2017 ◽  
Vol 15 (36) ◽  
pp. 7572-7579 ◽  
Author(s):  
Antonio J. Mota ◽  
Jürgen Neuhold ◽  
Martina Drescher ◽  
Sébastien Lemouzy ◽  
Leticia González ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Intramolecular Hydrogen Bonding ◽  
Hydrogen Bonding Interactions ◽  
Nmr Study ◽  
Intramolecular Hydrogen

Experimental and computational evidence for unusual intramolecular hydrogen-bonding interactions is presented and discussed.

Synthesis of a series of M(ii) (M = Mn, Fe, Co) chloride complexes with both inter- and intra-ligand hydrogen bonding interactions

2021 ◽  
Vol 50 (35) ◽  
pp. 12088-12092
Author(s):  
Clare A. Leahy ◽  
Michael J. Drummond ◽  
Josh Vura-Weis ◽  
Alison R. Fout
Keyword(s):  
Hydrogen Bonding ◽  
Transition Metal ◽  
Intramolecular Hydrogen Bonding ◽  
Metal Chloride ◽  
Chloride Complexes ◽  
Hydrogen Bonding Interactions ◽  
Transition Metal Chloride ◽  
Hydrogen Bonding Networks ◽  
Intramolecular Hydrogen

Hydrogen bonding networks are vital for metallo-enzymes to function; however, modeling these systems is non-trivial. The development of 1st-row transition metal chloride complexes with intramolecular hydrogen-bonding interactions are detailed herein.

Longipilin acetate

2006 ◽  
Vol 62 (4) ◽  
pp. o1330-o1332 ◽  
Author(s):  
Olga L. Ospina ◽  
Carlos A. Rojas ◽  
Daniel Vega
Keyword(s):  
Hydrogen Bonding ◽  
Intramolecular Hydrogen Bonding ◽  
Membered Ring ◽  
Native Plant ◽  
Hydrogen Bonding Interactions ◽  
Molecular Folding ◽  
Intramolecular Hydrogen

Longipilin acetate, C23H28O9, is a compound isolated from Espeletia killipii, a Colombian native plant. The molecule contains two non-planar rings, a ten-membered ring and a five-membered lactone. Various substituents around the ten-membered ring provide very weak intramolecular hydrogen-bonding interactions that determine the molecular folding.

THE EFFECT OF SUBSTITUTION ON STRUCTURE, INTRAMOLECULAR HYDROGEN BONDING STRENGTH, ELECTRON DENSITY AND RESONANCE IN 3-AMINO 2-IMINOMETHYL ACRYL ALDEHYDE

2012 ◽  
Vol 11 (05) ◽  
pp. 925-939 ◽  
Author(s):  
HEIDAR RAISSI ◽  
MAHDI YOOSEFIAN ◽  
FARIBA MOLLANIA ◽  
FARZANEH FARZAD
Keyword(s):  
Hydrogen Bonding ◽  
Electron Density ◽  
Population Analysis ◽  
Intramolecular Hydrogen Bonding ◽  
Analysis Data ◽  
Covalent Character ◽  
Hydrogen Bonding Interactions ◽  
Hydrogen Bond Strength ◽  
Intramolecular Hydrogen ◽  
Hydrogen Bonding Strength

B3LYP/6-311++G** calculations have been carried out to simulate the influence of substitutions in position R1 and R2 of 3-amino 2-iminomethyl acryl aldehyde on intramolecular hydrogen bond strength. The following substituents are taken into considerations: CN, NO2, Cl, F, CH3, CHO, NH2, C2H5, SH, SCH3, CF3 and CH3CO and their vibrational frequencies are calculated at the same level of theory. Quantum theory of "Atoms in Molecules" and Natural Bond Orbitals method were applied to analyzed H-bond interactions. The electron density (ρ) and Laplacian (∇2ρ) properties, estimated by AIM calculations, indicate that N⋯H bond possesses low ρ and positive ∇2ρ values which are in agreement with electrostatic character of the HBs, whereas N–H bonds have covalent character (∇2ρ < 0). Natural population analysis data, the electron density and Laplacian properties, as well as, ν (N-H) and γ (N-H) have been used to evaluate the hydrogen bonding interactions.

Urea-functionalized Resorcinarenes: Preparation, Self-folding, and Their CD Phenomena Caused by Chiral Urea Termini through Intramolecular Hydrogen Bonding Interactions

2004 ◽  
Vol 33 (8) ◽  
pp. 994-995 ◽  
Author(s):  
Osamu Hayashida ◽  
Jun-ichi Ito ◽  
Shinji Matsumoto ◽  
Itaru Hamachi
Keyword(s):  
Hydrogen Bonding ◽  
Intramolecular Hydrogen Bonding ◽  
Hydrogen Bonding Interactions ◽  
Intramolecular Hydrogen

Properties of Olean-12-ene-3α,16β,22α,28-tetrol and Some Derivatives

1996 ◽  
Vol 49 (7) ◽  
pp. 775 ◽  
Author(s):  
TW Hambley ◽  
TW Hambley ◽  
KG Lewis ◽  
KG Lewis ◽  
DJ Tucker ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Intramolecular Hydrogen Bonding ◽  
Crystallographic Data ◽  
Monoclinic Space Group ◽  
Orthorhombic Space Group ◽  
Ortho Ester ◽  
Polar Solvents ◽  
Space Group ◽  
X Ray ◽  
Intramolecular Hydrogen

Reaction of olean-12-ene-3β,16β,22α,28-tetrol ( chichipegenin ) (1) with methyl orthoformate gives the 16β,22α,28-orthoformate (2). Acetylation of the ortho ester followed by hydrolysis gives the tetrol 3β-monoacetate (5). It is shown that intramolecular hydrogen bonding occurs in the tetrol (1) and the 3β-monoacetate (5) in non-polar solvents. X-Ray crystallographic data on the tetrol and its tetraacetate (4) are reported. The tetrol,C30H50O4, M 474.72, crystallized in the orthorhombic space group P 212121 with a 12.363(6), b 31.888(3), c 6.962(3) Ǻ, V 2745(1) Ǻ3, Dc(Z = 4) 1.149 g cm-3, N = N(unique) 2394, No 1878 [I > 1.5σ(I)], Nvar 500; R 0.038, Rw 0.040. The tetraacetate , C38H58O8, M 642.87, crystallized in the monoclinic space group P 21, with a 10.603(2), b 16.569(1), c 10.814(1) Ǻ, β 98.72(1)°, V 1877.9(4) Ǻ3, Dc(Z = 2) 1.137g cm-3 N 3090, Rmerge 4.67% for N(unique) 2917, No 2663 [I > 2.5σ(I)], Nvar 414; R 0.053, Rw 0.050.

Emergent Supramolecular Assembly Properties of Recognition-Encoded Oligoesters

2019 ◽  
Author(s):  
Filip Szczypiński ◽  
Luca Gabrielli ◽  
Christopher Hunter
Keyword(s):  
Hydrogen Bonding ◽  
Three Dimensional ◽  
Supramolecular Assembly ◽  
Functional Materials ◽  
Intramolecular Hydrogen Bonding ◽  
Dimensional Structure ◽  
Stem Loop ◽  
Recognition Sites ◽  
Hydrogen Bonding Interactions ◽  
Intramolecular Hydrogen

The sequences of oligomeric molecules equipped with interacting side-chains encode the three-dimensional structure, the supramolecular assembly properties, and ultimately function. In an attempt to replicate the duplex forming properties of nucleic acids, an oligoester containing an alternating sequence of hydrogen bonding donor (<b>D</b>) and acceptor (<b>A</b>) residues was synthesised. Characterisation of assembly properties of the <b>ADAD</b> oligomer revealed a supramolecular architecture that resembles the kissing stem-loops motif found in folded RNA. NMR dilution and melting experiments in chloroform and 1,1,2,2-tetrachloroethane show that intramolecular hydrogen bonding interactions between the terminal phenol and phosphine oxide recognition sites in the <b>ADAD</b> 4-mer leads to 1,4-folding. This folded stem-loop structure can be denatured to give the single strand by heating. At higher concentrations or lower temperatures, the stem-loop dimerises via intermolecular hydrogen bonding interactions between the two inner recognition sites, leading to a kissing stem-loops structure. The results suggest a rich supramolecular chemistry for these recognition-encoded oligoesters and lay strong foundations for the future development of new functional materials based on synthetic information molecules.

A zirconium zwitterion containing a caged amine H atom

2003 ◽  
Vol 59 (11) ◽  
pp. m494-m496 ◽  
Author(s):  
Alastair J. Nielson ◽  
Chaohong Shen ◽  
Joyce M. Waters
Keyword(s):  
Hydrogen Bonding ◽  
Intramolecular Hydrogen Bonding ◽  
Octahedral Geometry ◽  
Distorted Octahedral Geometry ◽  
Charge Balance ◽  
Aromatic Rings ◽  
Hydrogen Bonding Interactions ◽  
Distorted Octahedral ◽  
Intramolecular Hydrogen

The crystallographically centrosymmetric zwitterion bis[tris(3,5-dimethyl-2-oxidobenzyl-κO)ammonium]zirconium(IV) crystallizes as the chloroform disolvate, [Zr(C27H31NO3)2]·2CHCl3, with the two molecules of chloroform closely associated with two of the aromatic rings. The Zr atom has a distorted octahedral geometry with three phenoxy O atoms from each of the two ligands coordinated to it. Charge balance is maintained by protonation of each N atom, which then forms intramolecular hydrogen-bonding interactions to all three adjacent O atoms.

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