A complex reaction product of dimolybdenum tetraacetate with aqueous hydrochloric acid. Structural characterization of the hydrido-bridged [Mo2Cl8H]3- ion, the [Mo(O)Cl4(H2O)]- ion, and an H5O2+ ion with an exceptionally short hydrogen bond

1979 ◽  
Vol 101 (15) ◽  
pp. 4150-4154 ◽  
Author(s):  
Avi Bino ◽  
F. Albert Cotton
Keyword(s):  
Hydrogen Bond ◽  
Hydrochloric Acid ◽  
Structural Characterization ◽  
Complex Reaction ◽  
Aqueous Hydrochloric Acid ◽  
Short Hydrogen Bond

STRUCTURAL CHARACTERIZATION OF BI-NUCLEAR COBALT(III) AXIAL-METHYL ALCOHOL-HYDROCHLORIC ACID TETRAPHENYL-PORPHYRIN COMPLEX

1999 ◽  
Vol 48 (3) ◽  
pp. 191-205 ◽  
Author(s):  
Khaled Mohamed Elewa Hashem ◽  
Hamdi Ahmed Hassan ◽  
Hany Mohamed Abdel Dayem ◽  
Salah Abdu Hassan
Keyword(s):  
Hydrochloric Acid ◽  
Methyl Alcohol ◽  
Structural Characterization ◽  
Porphyrin Complex ◽  
Tetraphenyl Porphyrin

Hybrid αγ Polypeptides: Structural Characterization of a C12/C10Helix with Alternating Hydrogen-Bond Polarity

2008 ◽  
Vol 47 (34) ◽  
pp. 6430-6432 ◽  
Author(s):  
Prema G. Vasudev ◽  
Sunanda Chatterjee ◽  
Kuppanna Ananda ◽  
Narayanaswamy Shamala ◽  
Padmanabhan Balaram
Keyword(s):  
Hydrogen Bond ◽  
Structural Characterization ◽  
Bond Polarity

scholarly journals Co(NCS)2(abpt)2 and Ni(NCS)2(abpt)2 [abpt is 4-amino-3,5-bis(pyridin-2-yl)-1,2,4-triazole]: structural characterization of polymorphs A and B

2021 ◽  
Vol 77 (12) ◽  
Author(s):  
Helen E. Mason ◽  
Judith A. K. Howard ◽  
Hazel A. Sparkes
Keyword(s):  
Hydrogen Bond ◽  
Structural Characterization ◽  
Spin Crossover ◽  
Stacking Interactions ◽  
Π Stacking

The synthesis and structures of bis[4-amino-3,5-bis(pyridin-2-yl)-1,2,4-triazole-κ2 N 2,N 3]bis(thiocyanato-κN)cobalt(II), [Co(NCS)2(C12H10N6)2] or Co(NCS)2(abpt)2, and bis[4-amino-3,5-bis(pyridin-2-yl)-1,2,4-triazole-κ2 N 2,N 3]bis(thiocyanato-κN)nickel(II), [Ni(NCS)2(C12H10N6)2] or Ni(NCS)2(abpt)2, are reported. In both cases, two polymorphs, A and B, were identified and structurally characterized. For both polymorphs, the structures obtained with the different metals, i.e. CoII or NiII, were found to be isostructural. All of the structures contained an intramolecular N—H...N hydrogen bond, C—H...N interactions and π–π stacking interactions. No structural evidence was observed for a thermal spin crossover for either of the Co(NCS)2(abpt)2 polymorphs between 300 (2) and 120 (2) K.

Structural characterization of protonated benzeneseleninic acid, the dihydroxyselenonium ion

2000 ◽  
Vol 56 (6) ◽  
pp. 1029-1034 ◽  
Author(s):  
Henning Osholm Sørensen ◽  
Nicolai Stuhr-Hansen ◽  
Lars Henriksen ◽  
Sine Larsen
Keyword(s):  
Hydrogen Bond ◽  
Chemical Shift ◽  
Structural Characterization ◽  
Strong Acid ◽  
Crystallization Behaviour ◽  
Methyl Group ◽  
Bond Lengths ◽  
Pyramidal Configuration

The structure of the dihydroxyphenylselenonium ion (C_{6}H_{7}O_{2}Se^{+}) has been determined in its benzenesulfonate (C_{6}H_{5}O_{3}Se^{-}) and p-toluenesulfonate (C_{7}H_{7}O_{3}S ^{-}) salts. Whereas the former salt is disordered, the latter less dense salt is well defined. This difference in crystallization behaviour is attributed to a C—H...O hydrogen bond involving the methyl group of the p-toluenesulfonate ion. The two salts display very similar hydrogen-bond arrangements and differ only with respect to the stacking of the phenyl groups. The dihydroxyselenonium ion is a strong acid with a pK value of −0.9 determined from the variation of the 77Se chemical shift. A comparison with the two deprotonated species reveals a systematic increase in the Se—O bond lengths and the pyramidal configuration around Se with the number of protons attached.

Synthesis and structural characterization of two triclinic modifications of diethylammonium trans-tetrachlorobis(dimethylsulfoxide-S)rhodate(III): an example of hydrogen-bond acceptor structural isomerism

1988 ◽  
Vol 66 (5) ◽  
pp. 1123-1128 ◽  
Author(s):  
Sujatha N. Gamage ◽  
Brian R. James ◽  
Steven J. Rettig ◽  
James Trotter
Keyword(s):  
Hydrogen Bond ◽  
Hydrochloric Acid ◽  
Hydrogen Bonds ◽  
Hydrogen Bond Acceptor ◽  
Fourier Methods ◽  
Full Matrix ◽  
Space Group ◽  
Type Formula ◽  
Structural Isomerism

Two crystalline modifications (I and II) of diethylammonium trans-tetrachlorobis(dimethylsulfoxide-S)rhodate(III) have been isolated from the same reaction mixture. The compound is formed by hydrolysis, in the presence of hydrochloric acid, of an η1-ylidic enamine complex of rhodium(III), which is made via dehydrogenation of triethylamine in the presence of mer-trichlorotris(dimethylsulfoxide)rhodium(III). Crystals of form I are triclinic, a = 8.1787(7), b = 10.761(1), c = 10.927(1) Å, α. = 86.681(6), β = 84.879(7), γ = 71.814(8)°, Z = 2, space group [Formula: see text], and those of form II are triclinic, a = 7.931(2), b = 9.489(2), c = 13.302(2) Å, α = 102.03(1), β = 97.40(1), γ = 107.49(1)°, Z = 2, space group [Formula: see text].Both structures were solved by Patterson and Fourier methods and were refined by full-matrix least-squares procedures to R = 0.024 and 0.060 for 4959 and 4320 reflections with I ≥ 3σ(I), respectively. Both crystal structures consist of centrosymmetric [RhCl4(Me2SO)2]− anions and (NEt2H2)+ cations, linked by hydrogen bonds to form infinite chains. In form I the hydrogen bonds are all of the type [Formula: see text], while in form II they are all of the type [Formula: see text].

scholarly journals New insights in the discovery of novelh-MAO-B inhibitors: structural characterization of a series ofN-phenyl-4-oxo-4H-chromene-3-carboxamide derivatives

2015 ◽  
Vol 71 (5) ◽  
pp. 547-554 ◽  
Author(s):  
Ligia R. Gomes ◽  
John Nicolson Low ◽  
Fernando Cagide ◽  
Daniel Chavarria ◽  
Fernanda Borges
Keyword(s):  
Hydrogen Bond ◽  
Carbonyl Group ◽  
Intramolecular Hydrogen Bond ◽  
Structural Characterization ◽  
Phenyl Ring ◽  
Carbonyl Groups ◽  
Pyrone Ring ◽  
Mao B ◽  
Intramolecular Hydrogen

SixN-substituted-phenyl 4-oxo-4H-chromene-3-carboxamides, namelyN-(2-nitrophenyl)-4-oxo-4H-chromene-3-carboxamide, C16H10N2O5(2b),N-(3-methoxyphenyl)-4-oxo-4H-chromene-3-carboxamide, C17H13NO4, (3a),N-(3-bromophenyl)-4-oxo-4H-chromene-3-carboxamide, C16H10BrNO3, (3b),N-(4-methoxyphenyl)-4-oxo-4H-chromene-3-carboxamide, C17H13NO4, (4a),N-(4-methylphenyl)-4-oxo-4H-chromene-3-carboxamide, C17H13NO3, (4d), andN-(4-hydroxyphenyl)-4-oxo-4H-chromene-3-carboxamide, C16H11NO4, (4e), have been structurally characterized. All compounds exhibit ananticonformation with respect to the C—N rotamer of the amide and atrans-related conformation with the carbonyl groups of the chromone ring of the amide. These structures present an intramolecular hydrogen-bonded network comprising an N—H...O hydrogen bond between the amide N atom and the O atom of the carbonyl group of the pyrone ring, forming anS(6) ring, and a weak Car—H...O hydrogen bond in which the carbonyl group of the amide acts as acceptor for the H atom of anortho-C atom of the exocyclic phenyl ring, which results in anotherS(6) ring. The N—H...O intramolecular hydrogen bond constrains the carboxamide moiety such that it is virtually coplanar with the chromone ring.

Hybrid αγ Polypeptides: Structural Characterization of a C12/C10Helix with Alternating Hydrogen-Bond Polarity

2008 ◽  
Vol 120 (34) ◽  
pp. 6530-6532 ◽  
Author(s):  
Prema G. Vasudev ◽  
Sunanda Chatterjee ◽  
Kuppanna Ananda ◽  
Narayanaswamy Shamala ◽  
Padmanabhan Balaram
Keyword(s):  
Hydrogen Bond ◽  
Structural Characterization ◽  
Bond Polarity
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