Role of Hydrogen Bonding in the pH-Dependent Aggregation of Colloidal Gold Particles Bearing Solution-Facing Carboxylic Acid Groups

2009 ◽  
Vol 113 (32) ◽  
pp. 14236-14244 ◽  
Author(s):  
Thomas C. Preston ◽  
Mohammad Nuruzzaman ◽  
Nathan D. Jones ◽  
Silvia Mittler
Keyword(s):  
Hydrogen Bonding ◽  
Carboxylic Acid ◽  
Colloidal Gold ◽  
Gold Particles ◽  
Carboxylic Acid Groups ◽  
Ph Dependent

Inhibitors of the geotropic response in plants. The crystal structures of 2-[(Naphthalen-2-yl)carbamoyl]benzoic acid (β-Naptalam), 2-(Phenylcarbamoyl)-benzoic acid and 2-(5-Phenyl-1,3,4-oxadiazol-2-yl)benzoic acid

1983 ◽  
Vol 36 (12) ◽  
pp. 2455 ◽  
Author(s):  
G Smith ◽  
CHL Kennard ◽  
GF Katekar
Keyword(s):  
Hydrogen Bonding ◽  
Carboxylic Acid ◽  
Benzoic Acid ◽  
Crystal Structures ◽  
Carboxylic Acids ◽  
Intermolecular Hydrogen Bonding ◽  
X Ray Diffraction ◽  
X Ray ◽  
Carboxylic Acid Groups ◽  
Phthalamic Acid

The crystal structures of three geotropically active phthalamic acid derivatives have been determined by means of X-ray diffraction and the structural systematics for the series compared. The three acids are conformationally similar and, in contrast to the tendency among carboxylic acids to form hydrogen-bonded dimers, they exist as monomers with intermolecular hydrogen bonding between the carboxylic acid groups and the nitrogen or oxygen of the amide side chains.

Metal organic frameworks decorated with free carboxylic acid groups: topology, metal capture and dye adsorption properties

2020 ◽  
Vol 49 (41) ◽  
pp. 14690-14705
Author(s):  
M. Naqi Ahamad ◽  
M. Shahnawaz Khan ◽  
M. Shahid ◽  
Musheer Ahmad
Keyword(s):  
Carboxylic Acid ◽  
Metal Organic Frameworks ◽  
Dye Adsorption ◽  
Adsorption Properties ◽  
Carboxylic Acid Groups ◽  
Metal Capture ◽  
Metal Organic

Elaborating the role of uncoordinated carboxylic acid functions in MOFs in post synthetic modification (PSM) through metal capture and hence in tuning dye adsorption properties.

Dimethyl 3t,4t-dicarboxytetrahydrofuran-2r,5c-dicarboxylate

2006 ◽  
Vol 62 (5) ◽  
pp. o1724-o1726 ◽  
Author(s):  
Claude Villiers ◽  
Pierre Thuéry ◽  
Michel Ephritikhine
Keyword(s):  
Hydrogen Bonding ◽  
Carboxylic Acid ◽  
Title Compound ◽  
Membered Ring ◽  
Tetracarboxylic Acid ◽  
Carboxylic Acid Groups ◽  
Compound C ◽  
Twist Conformation

Esterification of tetrahydrofuran-2r,3t,4t,5c-tetracarboxylic acid gave selectively the title compound, C10H12O9, in which the two more acidic carboxylic acid groups, in positions 2 and 5, have been esterified. The five-membered ring is in a twist conformation. Hydrogen bonding results in double chains, or ribbons, running along the c axis.

Hydrogen-bonding patterns in 2-amino-4,6-dimethoxypyrimidine–phthalic acid (1/1)

2007 ◽  
Vol 63 (11) ◽  
pp. o4212-o4212 ◽  
Author(s):  
Kaliyaperumal Thanigaimani ◽  
Packianathan Thomas Muthiah ◽  
Daniel E. Lynch
Keyword(s):  
Hydrogen Bonding ◽  
Carboxylic Acid ◽  
Hydrogen Bonds ◽  
Phthalic Acid ◽  
Helical Chain ◽  
Acid Form ◽  
Carboxylic Acid Groups ◽  
Π Stacking ◽  
Centroid Distance ◽  
Ring Motif

In the title cocrystal, C6H9N3O2·C8H6O4, both carboxylic acid groups of phthalic acid form an R 2 2(8) ring motif (through N—H...O and O—H...N hydrogen bonds) on either side of the 2-amino-4,6-dimethoxypyrimidine molecule, generating a helical chain along the b axis. This chain is interpenetrated by a centrosymmetrically related chain to which it is linked by π–π stacking [perpendicular separation 3.332 Å, centroid–centroid distance 3.6424 (7) Å].

Evidence for Chemical Interaction in Carbon and Polymer Associations. Butyl and Acidic Oxy Blacks. The Possible Role of Carboxylic Acid Groups on the Black

1969 ◽  
Vol 42 (3) ◽  
pp. 850-857 ◽  
Author(s):  
A. M. Gessler
Keyword(s):  
Carboxylic Acid ◽  
Chemical Interaction ◽  
Interaction Mechanism ◽  
Carboxyl Groups ◽  
Carboxylic Acid Groups

Abstract Assuming that the enhanced reinforcement capacity of oxidized black in butyl is related specifically to acidity provided by carboxyl groups on the surface of the black, the black was neutralized by esterification and saponification, respectively. The reduced carbon-polymer bonding activity resulting from these neutralizations is discussed in the light of the cationic interaction mechanism which it is proposed is involved.

scholarly journals Crystal structure of 4-{[(naphthalen-2-yl)sulfonylamino]methyl}cyclohexanecarboxylic acid

2015 ◽  
Vol 71 (3) ◽  
pp. o145-o145 ◽  
Author(s):  
Muhammad Danish ◽  
Muhammad Nawaz Tahir ◽  
Asif Hussain ◽  
Muhammad Ashfaq ◽  
Muhammad Nadeem Sadiq
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Carboxylic Acid ◽  
Hydrogen Bonds ◽  
Tranexamic Acid ◽  
Title Compound ◽  
Π Interactions ◽  
Carboxylic Acid Groups ◽  
Compound C ◽  
Thick Layers

The title compound, C18H21NO4S, is a new sulfonamide derivative of tranexamic acid. In the crystal, molecules form inversion dimersviaO—H...O hydrogen bonds involving the carboxylic acid groups. Hydrogen bonding between the sulfonamide N—H group and the carboxylic acid O atom assembles the dimers into thick layers parallel to (100). The naphthalene groups of adjacent layers are arranged in a herring-bone motif. There are C—H...π interactions between the naphthalene rings of neighbouring layers.

Role of carboxylic acid groups in the reduction of nitric oxide by carbon at low temperature, as exemplified by graphene oxide

2017 ◽  
Vol 19 (33) ◽  
pp. 22462-22471 ◽  
Author(s):  
J. Zhang ◽  
Q. Gao ◽  
X. M. Li ◽  
J. Z. Zhou ◽  
X. X. Ruan ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Graphene Oxide ◽  
Carboxylic Acid ◽  
Low Temperature ◽  
Active Sites ◽  
Reduction Of No ◽  
Carboxylic Acid Groups ◽  
Nano Carbon ◽  
First Time

This work reported the reduction of NO by carboxylic acid groups and the derived active sites on nano-carbon at a temperature as low as 100 °C for the first time.

Cobalt(II) and cadmium(II) square grids supported with 4,4′-bipyrazole and accommodating 3-carboxyadamantane-1-carboxylate

2013 ◽  
Vol 69 (3) ◽  
pp. 232-236 ◽  
Author(s):  
Olga M. Nazarenko ◽  
Eduard B. Rusanov ◽  
Alexander N. Chernega ◽  
Konstantin V. Domasevitch
Keyword(s):  
Hydrogen Bonding ◽  
Carboxylic Acid ◽  
Water Molecules ◽  
Two Dimensional ◽  
Carboxylate Ligands ◽  
Carboxylic Acid Groups ◽  
Solvent Water ◽  
The Third ◽  
Carboxylate Groups ◽  
Third Dimension

In poly[[bis(μ-4,4′-bi-1H-pyrazole-κ2N2:N2′)bis(3-carboxyadamantane-1-carboxylato-κO1)cobalt(II)] dihydrate], {[Co(C12H15O4)2(C6H6N4)2]·2H2O}n, (I), the Co2+cation lies on an inversion centre and the 4,4′-bipyrazole (4,4′-bpz) ligands are also situated across centres of inversion. In its non-isomorphous cadmium analogue, {[Cd(C12H15O4)2(C6H6N4)2]·2H2O}n, (II), the Cd2+cation lies on a twofold axis. In both compounds, the metal cations adopt an octahedral coordination, with four pyrazole N atoms in the equatorial plane [Co—N = 2.156 (2) and 2.162 (2) Å; Cd—N = 2.298 (2) and 2.321 (2) Å] and two axial carboxylate O atoms [Co—O = 2.1547 (18) Å and Cd—O = 2.347 (2) Å]. In both structures, interligand hydrogen bonding [N...O = 2.682 (3)–2.819 (3) Å] is essential for stabilization of theMN4O2environment with its unusually high (for bulky adamantanecarboxylates) number of coordinatedN-donor co-ligands. The compounds adopt two-dimensional coordination connectivities and exist as square-grid [M(4,4′-bpz)2]nnetworks accommodating monodentate carboxylate ligands. The interlayer linkage is provided by hydrogen bonds from the carboxylic acid groupsviathe solvent water molecules [O...O = 2.565 (3) and 2.616 (3) Å] to the carboxylate groups in the next layer [O...O = 2.717 (3)–2.841 (3) Å], thereby extending the structures in the third dimension.

Correlative microscopy of colloidal gold-labeled and unlabeled cell-surface-associated molecules: LV-SEM, SEM, and VLM

1994 ◽  
Vol 52 ◽  
pp. 1016-1017
Author(s):  
R. M. Albrecht ◽  
S. R. Simmons ◽  
S. J. Eppell ◽  
R. E. Marchant
Keyword(s):  
Colloidal Gold ◽  
Receptor Complex ◽  
Correlative Microscopy ◽  
Sem Images ◽  
Gold Particles ◽  
Soluble Ligand ◽  
Unlabeled Cell ◽  
Gold Conjugate ◽  
Complex Movement

Video enhanced, interference based light microscopy (VLM) is sufficiently sensitive to permit observation, via the inflated diffraction image, of colloidal gold particles as small as 15nm. These particles can be directly coupled to ligands such that ligand binding, distribution, and ligand-receptor complex movement can be observed on living cells (Fig.1a-d) and correlated subsequently with HVEM and/or SEM images of the same cell (Fig. 1e). The size of the gold particles used in these studies is such that, other than for very large ligands, generally two or more ligand molecules are bound per particle. Thus questions regarding the role of the polyvalent “particle” (ligand-gold conjugate) vs. soluble ligand can arise. Observation of individual labeled or unlabeled ligand molecules can therefore become useful in resolving such questions when they occur.

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