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The phosphate buffer system is a critical biological mechanism for maintaining pH stability in the body. This system operates primarily through two components: sodium dihydrogen phosphate (NaH2PO4), which acts as a weak acid, and sodium hydrogen phosphate (Na2HPO4), which serves as a weak base.
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4-Hydroxy-pyridinium hydrogen sulfate.

Li-Hua Huo, Ying-Ming Xu, Shan Gao

Acta Crystallographica. Section E, Structure Reports Online

|May 18, 2011

Summary

This summary is machine-generated.

The crystal structure of 4-hydroxy-pyridinium hydrogen sulfate reveals planar cations and anions forming a layer via hydrogen bonds. The anion exhibits a longer S-O bond where the acid hydrogen is located.

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Area of Science:

Crystallography
Solid-state chemistry
Hydrogen bonding

Background:

Understanding the crystal structures of organic salts is crucial for predicting their physical and chemical properties.
Hydrogen bonding plays a significant role in the self-assembly and structural organization of ionic compounds.

Purpose of the Study:

To determine the detailed crystal structure of 4-hydroxy-pyridinium hydrogen sulfate.
To investigate the hydrogen bonding interactions between the cation and anion.
To analyze the bond lengths within the hydrogen sulfate anion.

Main Methods:

Single-crystal X-ray diffraction was employed to elucidate the crystal structure.
Analysis of atomic positions and bond lengths was performed.

Main Results:

The crystal structure consists of planar 4-hydroxy-pyridinium cations and hydrogen sulfate anions.
These ions are arranged in a layered motif facilitated by hydrogen bonding.
A distinct difference in S-O bond lengths was observed in the hydrogen sulfate anion, with the bond to the acidic proton being significantly longer.

Conclusions:

The study provides a precise structural description of 4-hydroxy-pyridinium hydrogen sulfate.
The hydrogen bonding network dictates the layered arrangement of the salt.
The observed S-O bond length variation in the anion is consistent with protonation.