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Related Concept Videos

Polyprotic Acids03:38

Polyprotic Acids

Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
Ions as Acids and Bases02:54

Ions as Acids and Bases

Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
Structures of Carboxylic Acid Derivatives01:28

Structures of Carboxylic Acid Derivatives

Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the unhybridized p...
Titration of Polyprotic Acids with a Strong Base01:23

Titration of Polyprotic Acids with a Strong Base

Titration of a polyprotic acid, which contains multiple ionizable protons, involves distinct dissociation steps, each with its own dissociation constant (Ka). Each successive Ka is weaker than the previous one. In the titration of a polyprotic acid like sulfurous acid with a strong base such as sodium hydroxide, the base first neutralizes the initial ionizable proton, forming an intermediate species (e.g., hydrogen sulfite ions). This step's titration curve resembles that of a weak monoprotic...
Acidity and Basicity of Alcohols and Phenols02:36

Acidity and Basicity of Alcohols and Phenols

Like water, alcohols are weak acids and bases. This is attributed to the polarization of the O–H bond making the hydrogen partially positive. Moreover, the electron pairs on the oxygen atom of alcohol make it both basic and nucleophilic. Protonation of an alcohol converts hydroxide, a poor leaving group, into water—a good one. The two acid–base equilibria corresponding to ethanol are depicted below.
Acidity of Carboxylic Acids01:21

Acidity of Carboxylic Acids

Carboxylic acids are the strongest organic acids. However, their acidic strength is much less than mineral acids like HCl. Carboxylic acids ionize in water and readily lose the hydroxyl proton to form a resonance-stabilized carboxylate ion.

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Poly[potassium-μ-2-[2-(carboxymethyl)phenyl]acetato].

Reyes García-Zarracino, Marcela Rangel-Marrón, Hugo Tlahuext

    Acta Crystallographica. Section E, Structure Reports Online
    |May 18, 2011
    PubMed
    Summary

    This study reveals a novel potassium coordination polymer formed by 2-[2-(carboxymethyl)phenyl]acetate anions. The structure features cation-π interactions and one-dimensional polymer chains linked by hydrogen bonds.

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    Area of Science:

    • Inorganic Chemistry
    • Crystal Engineering
    • Supramolecular Chemistry

    Background:

    • Coordination polymers offer diverse structural motifs and potential applications.
    • Understanding cation-anion interactions is crucial for designing novel materials.
    • The 2-[2-(carboxymethyl)phenyl]acetate ligand presents interesting coordination possibilities.

    Purpose of the Study:

    • To synthesize and characterize a new potassium coordination polymer.
    • To investigate the structural features, including coordination environment and intermolecular interactions.
    • To explore the self-assembly behavior of the 2-[2-(carboxymethyl)phenyl]acetate ligand with potassium ions.

    Main Methods:

    • Single-crystal X-ray diffraction was employed to determine the crystal structure.
    • Infrared spectroscopy was used to confirm the presence of functional groups and hydrogen bonding.
    • Analysis of coordination numbers and bond distances elucidated the K+ ion environment.

    Main Results:

    • A one-dimensional coordination polymer of potassium with 2-[2-(carboxymethyl)phenyl]acetate was successfully synthesized.
    • Potassium ions are six-coordinate, interacting with six oxygen atoms from three different anions.
    • A significant cation-π interaction was observed at approximately 3.14 Å.
    • Intramolecular O-H⋯O hydrogen bonds stabilize the anions.
    • Intermolecular C-H⋯O hydrogen bonds link the polymer chains.

    Conclusions:

    • The study presents a novel 1D potassium coordination polymer with unique structural features.
    • The observed cation-π interaction and hydrogen bonding play key roles in the crystal packing and stability.
    • This work contributes to the understanding of coordination chemistry and crystal engineering of carboxylate-based materials.