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¹H NMR: Pople Notation

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The Pople nomenclature system classifies spin systems based on the difference between their chemical shifts. Coupled spins are denoted by capital letters with subscripts indicating the number of equivalent nuclei. When the coupled nuclei have well-separated chemical shifts, they are assigned letters that are far apart in the alphabet, such as A and X. When the difference in chemical shifts is small, coupled nuclei are named using adjacent letters of the alphabet (AB, MN, or XY).
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Updated: Jun 2, 2026

Chemical Precipitation Method for the Synthesis of Nb2O5 Modified Bulk Nickel Catalysts with High Specific Surface Area

Chemical Precipitation Method for the Synthesis of Nb₂O₅ Modified Bulk Nickel Catalysts with High Specific Surface Area

Published on: February 19, 2018

Al(0.5)Nb(1.5)(PO(4))(3).

Dan Zhao¹, Peng Liang, Ling Su

¹Department of Physics and Chemistry, Henan Polytechnic University, Jiaozuo, Henan 454000, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online

|April 28, 2011

Summary

This summary is machine-generated.

Single crystals of aluminium niobium triphosphate were synthesized. This compound features a disordered structure with isolated octahedra and tetrahedra forming a 3D framework with channels.

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Area of Science:

Solid-state chemistry
Materials science
Crystallography

Background:

Aluminium niobium triphosphate (Al(0.5)Nb(1.5)(PO(4))(3)) is a complex inorganic compound.
Understanding the crystal structure of novel materials is crucial for potential applications.

Purpose of the Study:

To synthesize single crystals of aluminium niobium triphosphate.
To elucidate the crystal structure and atomic arrangement of the synthesized compound.

Main Methods:

High-temperature reaction synthesis in a platinum crucible.
Single crystal X-ray diffraction analysis (implied by structure determination).

Main Results:

Successful synthesis of single crystals of aluminium niobium triphosphate.
Al(III) and Nb(V) atoms share a crystallographic site with a 1:3 disorder.
The structure comprises isolated Al/NbO(6) octahedra and PO(4) tetrahedra, forming a 3D framework with channels along the a-axis.

Conclusions:

The crystal structure of aluminium niobium triphosphate has been determined.
The material exhibits a disordered distribution of Al and Nb atoms within the octahedra.
The resulting framework structure possesses channels, suggesting potential for ion exchange or host-guest chemistry.