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Related Concept Videos

Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
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Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Molecular Models02:00

Molecular Models

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Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
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Related Experiment Video

Updated: Jun 13, 2025

Ligand Nano-cluster Arrays in a Supported Lipid Bilayer
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Two-dimensional-lattice-confined single-molecule-like aggregates.

Kang Wang1,2, Zih-Yu Lin1, Angana De3

  • 1Davidson School of Chemical Engineering, Purdue University, West Lafayette, IN, USA.

Nature
|September 11, 2024
PubMed
Summary
This summary is machine-generated.

Researchers created a novel single-molecule-like aggregate (SMA) phase in 2D perovskite superlattices. This breakthrough unifies properties of single molecules and aggregates, enabling enhanced optoelectronic applications.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Intermolecular distance critically influences organic optoelectronic properties.
  • Conventional organic luminescent molecules are used as aggregates or diluted in matrices, leaving a gap in understanding intermediate states.
  • Existing methods struggle to balance proximity for aggregate-like behavior with isolation for single-molecule properties.

Purpose of the Study:

  • To investigate the behavior of organic luminescent molecules between aggregation and dilution states.
  • To report a novel molecular aggregate phase within a two-dimensional (2D) hybrid perovskite superlattice.
  • To explore the potential of this new phase for advanced photonic applications.

Main Methods:

  • Fabrication of 2D hybrid perovskite superlattices.
  • Implementation of molecular dynamics simulations.
  • Single-crystal structure analysis.

Main Results:

  • Discovery of a single-molecule-like aggregate (SMA) phase with near-equilibrium intermolecular distances.
  • Organic emitters in the superlattice remained electronically isolated despite proximity, achieving near-unity photoluminescence quantum yield.
  • Demonstrated strong emitter alignment, dense packing, directional emission, enhanced radiative recombination, and efficient lasing.

Conclusions:

  • The 2D perovskite superlattice enables a unique SMA phase by controlling molecular degrees of freedom.
  • This SMA phase successfully combines the advantageous properties of both single molecules and aggregates.
  • The findings open new avenues for developing advanced spectroscopic and photonic devices.