cis-Aquabis(2,2′-bipyridine-N,N′)[dichromato(2–)-O1]nickel(II)

2000 ◽  
Vol 57 (1) ◽  
pp. m43-m45
Author(s):  
Nélida Fernández-González ◽  
Cristina González-Silgo ◽  
Javier González-Platas ◽  
Pedro Gili ◽  
Pedro Martín-Zarza
Keyword(s):  
Molecular Structure ◽  
Hydrogen Bond ◽  
Hydrogen Bonding ◽  
Water Molecule ◽  
Intramolecular Hydrogen Bond ◽  
Title Compound ◽  
Octahedral Coordination ◽  
Intermolecular Hydrogen Bonding ◽  
Intramolecular Hydrogen

The molecular structure of the title compound, [Ni(C10H8N2)2(H2O){Cr2O7}], contains an NiIIatom with a distortedcis-octahedral coordination formed by two chelating bipyridine (bipy) ligands [mean Ni—Nbipy = 2.068 (3) Å], one water molecule [Ni—O = 2.086 (3) Å] and an O atom of the dichromate anion [Ni—O = 2.083 (2) Å]. One of the water H atoms is involved in the intramolecular hydrogen bond with the terminal O atom of the dichromate ligand [O...O 2.743 (5) Å], whereas its second H atom participates in the intermolecular hydrogen bonding [O...O 2.688 (4) Å]; the latter is responsible for the formation of the infinite chains stretching along the polarcaxis of the crystal.

Effects of the intramolecular hydrogen bond on intermolecular hydrogen bonding in hydroxybenzene-ether systems

1973 ◽  
Vol 77 (26) ◽  
pp. 3103-3106 ◽  
Author(s):  
J. N. Spencer ◽  
R. A. Heckman ◽  
R. S. Harner ◽  
S. L. Shoop ◽  
K. S. Robertson
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonding ◽  
Intramolecular Hydrogen Bond ◽  
Intermolecular Hydrogen Bonding ◽  
Intramolecular Hydrogen

N-Phenyl-2-(phenyliminomethyl)pyrrole-1-carboxamide

2007 ◽  
Vol 63 (11) ◽  
pp. o4265-o4265
Author(s):  
Wolfgang Imhof
Keyword(s):  
Molecular Structure ◽  
Hydrogen Bond ◽  
Intramolecular Hydrogen Bond ◽  
Title Compound ◽  
Phenyl Isocyanate ◽  
Compound C ◽  
Intramolecular Hydrogen

The title compound, C18H15N3O, was prepared from phenyl(1H-pyrrol-2-ylmethylene)amine and phenyl isocyanate in the presence of catalytic amounts of [Pd(PPh3)4]. The conformation of the molecular structure is determined by an intramolecular hydrogen bond between the amide NH function and the imine N atom. The molecule is essentially planar. Only the peripheral phenyl substitutents are bent out of the plane.

scholarly journals Crystal structure of a trigonal polymorph of aquadioxidobis(pentane-2,4-dionato-κ2 O,O′)uranium(VI)

2022 ◽  
Vol 78 (1) ◽  
Author(s):  
Alejandro Hernandez ◽  
Indranil Chakraborty ◽  
Gabriela Ortega ◽  
Christopher J. Dares
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Water Molecule ◽  
Equatorial Plane ◽  
Title Compound ◽  
Uranium Atom ◽  
Intermolecular Hydrogen Bonding ◽  
Two Dimensional ◽  
Asymmetric Unit ◽  
Acta Cryst

The title compound, [UO2(acac)2(H2O)] consists of a uranyl(VI) unit ([O=U=O]2+) coordinated to two monoanionic acetylacetonate (acac, C5H7O2) ligands and one water molecule. The asymmetric unit includes a one-half of a uranium atom, one oxido ion, one-half of a water molecule and one acac ligand. The coordination about the uranium atom is distorted pentagonal–bipyramidal. The acac ligands and Ow atom comprise the equatorial plane, while the uranyl O atoms occupy the axial positions. Intermolecular hydrogen bonding between complexes results in the formation of two-dimensional hexagonal void channels along the c-axis direction with a diameter of 6.7 Å. The monoclinic (P21/c space group) polymorph was reported by Alcock & Flanders [(1987). Acta Cryst. C43, 1480–1483].

1-{[5-Fluoro-2-(trifluoromethyl)phenyl]iminomethyl}-2-naphthol

2007 ◽  
Vol 63 (3) ◽  
pp. o1407-o1408
Author(s):  
Yun-Fa Zheng ◽  
Liang-Gui Wang ◽  
Guo-Bing Yan
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bond ◽  
Schiff Base ◽  
Intramolecular Hydrogen Bond ◽  
Title Compound ◽  
Stacking Interactions ◽  
Dimensional Chain ◽  
One Dimensional ◽  
Compound C ◽  
Intramolecular Hydrogen

The title compound, C18H11F4NO, a Schiff base, has been structurally characterized. One intramolecular hydrogen bond influences the conformation of the molecule. The crystal structure is extended into a one-dimensional chain along the c axis via π–π stacking interactions.

Electronic absorption spectra of nitroanilines

1979 ◽  
Vol 44 (5) ◽  
pp. 1613-1618 ◽  
Author(s):  
Viktor Řehák ◽  
Vladimír Kadeřábek
Keyword(s):  
Molecular Structure ◽  
Hydrogen Bond ◽  
Absorption Spectra ◽  
Intramolecular Hydrogen Bond ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Electronic System ◽  
Intramolecular Hydrogen ◽  
Absorption Transitions

Electronic absorption spectra of N-alkyl and N-arylsubstituted 2,4-dinitro- and 2,6-dinitroanilines are discussed in the terms of energy and intensity of the energetically lowest absorption transitions and molecular structure (intramolecular hydrogen bond, sterical effects, hyperconjugation and increase of the π-electronic system of the molecule.

True symmetry or pseudosymmetry: 5-amino-1-(4-methylphenylsulfonyl)-4-pyrazolin-3-one and a comparison with its 1-phenylsulfonyl analogue

2012 ◽  
Vol 69 (1) ◽  
pp. 90-92 ◽  
Author(s):  
Galal H. Elgemeie ◽  
Shahinaz H. Sayed ◽  
Peter G. Jones
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonds ◽  
Intramolecular Hydrogen Bond ◽  
Title Compound ◽  
Acta Cryst ◽  
Interplanar Angle ◽  
Phenyl Derivative ◽  
Compound C ◽  
Independent Molecules ◽  
Intramolecular Hydrogen

The title compound, C10H11N3O3S, (I), crystallizes as the NH tautomer. The two rings subtend an interplanar angle of 72.54 (4)°. An intramolecular hydrogen bond is formed from the NH2group to a sulfonyl O atom. The molecular packing involves layers of molecules parallel to thebcplane atx≃ 0, 1etc., with two classical linear hydrogen bonds (amino–sulfonyl and pyrazoline–carbonyl N—H...O) and a further interaction (amino–sulfonyl N—H...O) completing a three-centre system with the intramolecular contact. The analogous phenyl derivative, (II) [Elgemeie, Hanfy, Hopf & Jones (1998).Acta Cryst.C54, 136–138], crystallizes with essentially the same unit cell and packing pattern, but with two independent molecules that differ significantly in the orientation of the phenyl groups. The space group isP21/cfor (I) butP21for (II), which is thus a pseudosymmetric counterpart of (I).

THE STUDY OF HYDROGEN BONDING AND RELATED PHENOMENA BY SPECTROSCOPIC METHODS: PART VIII. THE ULTRAVIOLET AND INFRARED SPECTRA OF SOME 2,4-DINITRODIPHENYLAMINES

1964 ◽  
Vol 42 (12) ◽  
pp. 2674-2683 ◽  
Author(s):  
A. Balasubramanian ◽  
J. B. Capindale ◽  
W. F. Forbes
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonding ◽  
Spectral Data ◽  
Intramolecular Hydrogen Bond ◽  
Infrared Spectra ◽  
Positive Charge ◽  
Spectroscopic Methods ◽  
Amino Group ◽  
Strong Type ◽  
Intramolecular Hydrogen

The ultraviolet spectra of a number of 2,4-dinitrodiphenylamines suggest that these compounds are generally non-planar in a number of different solvents. The infrared and ultraviolet spectral data in different solvents also suggest that an intramolecular hydrogen bond is present in these molecules, at least in inert solvents. There is evidence that a p-nitro substituent is necessary to increase the positive charge on the amino group sufficiently to permit it to form this fairly strong type of hydrogen bond.

Intra- and inter-molecular hydrogen bonding in diphytanylglycerol phospholipids: an infrared spectroscopic investigation

1990 ◽  
Vol 68 (1) ◽  
pp. 266-273 ◽  
Author(s):  
L. C. Stewart ◽  
M. Kates ◽  
P. W. Yang ◽  
H. H. Mantsch
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Intramolecular Hydrogen Bond ◽  
Membrane Lipids ◽  
Head Group ◽  
Exact Nature ◽  
Oh Groups ◽  
Intramolecular Hydrogen ◽  
Phosphate Groups

A series of diphytanylglycerol phospholipids, i.e., diphytanylglycerol phosphate (PA), diphytanylglycerol phosphoglycerophosphate (PGP), the tri- and tetra-methyl derivatives of PGP, and the 2-deoxyglycerol analogue of PGP (dPGP) were studied by Fourier transform infrared spectroscopy. The use of the "deoxy" and methylated analogues of PGP, as well as that of PA and PGP of varying degrees of ionization, allowed the assignment of characteristic infrared bands associated with the phosphate groups. Analysis of these phosphate bands showed that at neutral pH, each of the two phosphate moieties in PGP is singly ionized, whereas in dPGP the phosphomonoester is doubly ionized. This is a consequence of the marked increase in the pK of one of the P-OH groups on the terminal phosphate of PGP (pK > 11), owing to the formation of an intramolecular hydrogen bond between the head group glycerol hydroxyl and the phosphate groups of PGP. Such an intramolecular hydrogen bond can not be formed by the dPGP analogue, and thus both negative charges in dPGP are located at the terminal phosphomonoester group. The O=P—OH groups of PGP also forms a network of intermolecular hydrogen bonds, the exact nature of which depends on concentration and degree of ionization. The possibility of a complex network of hydrogen bonds within (intramolecular) and between (intermolecular) anionic membrane lipids such as that found in PGP, is consistent with the hypothesis that these lipids function as proton-conducting pathways in membranes.Key words: phospholipids, infrared, hydrogen bonding, phosphatidylglycerophosphate, 2-deoxyphosphatidylglycerophosphate.

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