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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.

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Related Experiment Video

Updated: Jun 1, 2026

A Facile Synthetic Method to Obtain Bismuth Oxyiodide Microspheres Highly Functional for the Photocatalytic Processes of Water Depuration

A Facile Synthetic Method to Obtain Bismuth Oxyiodide Microspheres Highly Functional for the Photocatalytic Processes of Water Depuration

Published on: March 29, 2019

Cs(2)Bi(PO(4))(WO(4)).

Kateryna V Terebilenko, Igor V Zatovsky, Vyacheslav N Baumer

Acta Crystallographica. Section E, Structure Reports Online

|May 18, 2011

Summary

A novel material, Dicaesium bis-muth(III) phosphate(V) tungstate(VI) (Cs(2)Bi(PO(4))(WO(4))), was synthesized. Its structure features a 3D framework with interstitial cesium atoms.

Area of Science:

Inorganic Chemistry
Solid-State Chemistry
Crystallography

Background:

Complex oxides containing bismuth, phosphate, and tungstate groups are of interest for their diverse structural and functional properties.
The Cs(2)O-Bi(2)O(3)-P(2)O(5)-WO(3) system represents a complex phase space for exploring new inorganic materials.

Purpose of the Study:

To synthesize and characterize a new compound within the Cs(2)O-Bi(2)O(3)-P(2)O(5)-WO(3) system.
To determine the crystal structure and structural relationships of the synthesized material.

Main Methods:

Synthesis via investigation in a molten pseudo-quaternary system.
Crystallographic analysis to determine structural features.

Main Results:

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A Facile Synthetic Method to Obtain Bismuth Oxyiodide Microspheres Highly Functional for the Photocatalytic Processes of Water Depuration

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Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication

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Successful synthesis of Dicaesium bis-muth(III) phosphate(V) tungstate(VI), Cs(2)Bi(PO(4))(WO(4)).

The compound is isotypic with K(2)Bi(PO(4))(WO(4)).

A three-dimensional framework structure was elucidated, built from [Bi(PO(4))(WO(4))] nets composed of [BiPO(4)] layers and [WO(4)] tetrahedra, with Cs atoms occupying interstitial sites. Bi, W, and P atoms are located on crystallographic twofold axes.

Conclusions:

Dicaesium bis-muth(III) phosphate(V) tungstate(VI) is a new inorganic compound with a unique 3D framework structure.
The structural characterization provides insights into the formation and stability of complex phosphate-tungstate materials.