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Related Concept Videos

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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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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VSEPR Theory and the Basic Shapes02:52

VSEPR Theory and the Basic Shapes

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Overview of VSEPR Theory
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VSEPR Theory and the Effect of Lone Pairs04:01

VSEPR Theory and the Effect of Lone Pairs

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Effect of Lone Pairs of Electrons on Molecule Geometry
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Coordination Number and Geometry02:57

Coordination Number and Geometry

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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: Nov 6, 2025

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV

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γ-GeSe: A New Hexagonal Polymorph from Group IV-VI Monochalcogenides.

Sol Lee1,2, Joong-Eon Jung1, Han-Gyu Kim1

  • 1Department of Physics, Yonsei University, Seoul 03722, Korea.

Nano Letters
|May 10, 2021
PubMed
Summary

Researchers synthesized a new hexagonal germanium selenide (γ-GeSe) polymorph, a 2D material with high electrical conductivity. This discovery opens avenues for novel electronic devices and vertical heterostructures.

Keywords:
Hexagonal GeSegroup IV−VI monochalcogenidesnew polymorphpolarized Raman spectroscopytransmission electron microscopy

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Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups
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Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups

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The Synthesis of [Sn10SiSiMe334]2- Using a Metastable SnI Halide Solution Synthesized via a Co-condensation Technique
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The Synthesis of [Sn10SiSiMe334]2- Using a Metastable SnI Halide Solution Synthesized via a Co-condensation Technique

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Last Updated: Nov 6, 2025

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups
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The Synthesis of [Sn10SiSiMe334]2- Using a Metastable SnI Halide Solution Synthesized via a Co-condensation Technique
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The Synthesis of [Sn10SiSiMe334]2- Using a Metastable SnI Halide Solution Synthesized via a Co-condensation Technique

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Group IV-VI monochalcogenides possess puckered layered structures.
  • Atomic configurations suggest potential for diverse polymorphs.

Purpose of the Study:

  • To synthesize and characterize the first hexagonal polymorph of germanium selenide (GeSe).
  • To explore the electronic and optical properties of the novel γ-GeSe phase.

Main Methods:

  • Synthesis of four-atomic-thick hexagonal GeSe (γ-GeSe).
  • Structural characterization using elemental analysis, electron diffraction, HRTEM, and Raman spectroscopy.
  • Electrical and optical measurements.

Main Results:

  • Successful synthesis and identification of hexagonal γ-GeSe.
  • High electrical conductivity (3 × 10⁵ S/m) comparable to 2D semimetallic crystals.
  • Direct growth on hexagonal boron nitride (h-BN) substrates demonstrated.

Conclusions:

  • Hexagonal γ-GeSe is a novel 2D material with significant electrical conductivity.
  • Offers a bottom-up approach for creating vertical van der Waals heterostructures.
  • The unique crystal symmetry warrants further investigation into its physical properties.