Related Experiment Video
Updated: Jul 23, 2025
04:14
Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
13.0K
Structural diversity in proline-based lead bromide chiral perovskites.
Valerii Y Sirenko1, Olesia I Kucheriv1, Igor O Fritsky1
1Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska St. 64, 01601 Kyiv, Ukraine. illia.guralskyi@univ.kiev.ua.
Dalton Transactions (Cambridge, England : 2003)
|July 17, 2023
Summary
New chiral hybrid perovskites using L-proline were synthesized. These materials feature novel 1D and 2D inorganic structures, showing potential for advanced optoelectronic devices.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Crystallography
Background:
- Chiral hybrid perovskites are crucial for optoelectronic devices.
- Limited examples of chiral perovskites hinder research and development.
Purpose of the Study:
- To synthesize novel low-dimensional lead-halide hybrid perovskites incorporating L-proline.
- To characterize the structure, bonding, and optical properties of these new materials.
Main Methods:
- Synthesis of hybrid perovskites using varying precursor ratios.
- X-ray diffraction and Hirshfeld surface analysis for structural characterization.
- Tauc plot analysis for optical band gap determination.
- Photoluminescence spectroscopy for optical property assessment.
Main Results:
- Two new hybrid perovskites, (L-proH)PbBr3·H2O (Pro-PbBr) and (L-proH)4Pb3Br10·4H2O (Pro-PbBr), were synthesized.
- Pro-PbBr exhibits a 1D inorganic chain structure, while Pro-PbBr features a rare 2D honeycomb-type inorganic framework.
- Hydrogen bonding significantly influences the organic-inorganic interactions.
- Optical band gaps were determined to be 4.19 eV (Pro-PbBr) and 4.13 eV (Pro-PbBr).
- Broadband photoluminescence was observed at low temperatures, attributed to self-trapped excitons.
Conclusions:
- L-proline is a viable building block for novel chiral hybrid perovskites.
- The synthesized materials possess unique structural features and promising optical properties.
- These findings pave the way for future optoelectronic applications of chiral perovskites.
Related Concept Videos
02:05Prochirality
3.8K
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
3.8K
02:35Regioselectivity of Electrophilic Additions-Peroxide Effect
8.7K
In the presence of organic peroxides, the addition of hydrogen bromide to an alkene yields the isomer that is not predicted by Markovnikov’s rule. For example, the addition of hydrogen bromide to 2-methylpropene in the presence of peroxides gives 1-bromo-2-methylpropane. This addition reaction proceeds via a free radical mechanism, which reverses the regioselectivity. The free radical reaction mechanism involves three stages: initiation, propagation, and termination.
8.7K
02:30Chirality at Nitrogen, Phosphorus, and Sulfur
5.8K
Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
5.8K
00:58¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons
1.8K
Replacing each alpha-hydrogen in chloroethane by bromine (or a different functional group) yields a pair of enantiomers. Such protons are called prochiral or enantiotopic and are related by a mirror plane. Enantiotopic protons are chemically equivalent in an achiral environment. Because most proton NMR spectra are recorded using achiral solvents, enantiotopic hydrogens yield a single signal.
In chiral compounds such as 2-butanol, replacing the methylene hydrogens at C3 produces a pair of...
In chiral compounds such as 2-butanol, replacing the methylene hydrogens at C3 produces a pair of...
1.8K
02:52Stereoisomerism
12.2K
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...
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...
12.2K
01:26Polymer Classification: Stereospecificity
2.5K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
2.5K