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Stereoisomerism

Stereoisomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...

Properties of Enantiomers and Optical Activity

Properties of Enantiomers and Optical Activity

It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...

Trends in Lattice Energy: Ion Size and Charge

Trends in Lattice Energy: Ion Size and Charge

An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:

Properties of Organometallic Compounds

Properties of Organometallic Compounds

Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.

Colors and Magnetism

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...

Properties of Transition Metals

Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.

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Related Experiment Video

Updated: Jun 29, 2025

Synthesis of Non-uniformly Pr-doped SrTiO3 Ceramics and Their Thermoelectric Properties

Synthesis of Non-uniformly Pr-doped SrTiO3 Ceramics and Their Thermoelectric Properties

Published on: August 15, 2015

New iodate fluoride Rb₂Ce(IO₃)₅F with nonlinear optical properties.

Oksana P Grigorieva¹, Tatiana B Shatalova¹, Alexey N Kuznetsov¹

¹Lomonosov Moscow State University, Moscow 119991, Russia. berdonosov@inorg.chem.msu.ru.

Dalton Transactions (Cambridge, England : 2003)

|April 9, 2024

Summary

A new noncentrosymmetric cerium(IV) iodate fluoride, Rb2Ce(IO3)5F, exhibits promising nonlinear optical properties. This material is a direct-gap semiconductor with a band gap of approximately 2.33 eV.

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Synthesis of Non-uniformly Pr-doped SrTiO3 Ceramics and Their Thermoelectric Properties

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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals

Published on: April 14, 2020

Area of Science:

Solid-state chemistry
Materials science
Inorganic chemistry

Background:

Noncentrosymmetric materials are crucial for nonlinear optics.
Cerium(IV) compounds offer unique electronic and structural properties.
Exploration of novel iodate fluorides can lead to advanced functional materials.

Purpose of the Study:

To synthesize and characterize a new noncentrosymmetric cerium(IV) iodate fluoride.
To investigate the crystal structure, thermal stability, and electronic properties of the synthesized compound.
To evaluate its potential for nonlinear optical applications.

Main Methods:

Hydrothermal synthesis technique.
Single-crystal X-ray diffraction for structural analysis.
Density Functional Theory (DFT) calculations for electronic band structure.
Optical measurements to determine the band gap and nonlinear optical response.

Main Results:

Successful synthesis of Rb2Ce(IO3)5F, crystallizing in the Cmc21 space group.
Detailed crystal structure analysis revealing a 3D framework of polyhedra.
DFT calculations indicate a direct-gap semiconductor with a band gap of ~2.33 eV.
Experimental optical gap of ~2.35 eV and a second harmonic generation (SHG) signal comparable to KH2PO4.

Conclusions:

Rb2Ce(IO3)5F is a novel noncentrosymmetric material with potential in nonlinear optics.
Its semiconductor nature and significant SHG response make it a candidate for optoelectronic devices.
The hydrothermal method provides an effective route for synthesizing such advanced functional materials.