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Related Concept Videos

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 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.
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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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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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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Introduction
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Related Experiment Video

Updated: Mar 28, 2026

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Stabilizing Structural Transitional States between 1- and 2-Dimensional Topologies via Hydrogen Bond-Mediated Crystal

Mariya Aleksich1,2, Adriana J Ladera3, Avery LaMonica1,2

  • 1Department of Chemistry, University of Connecticut, 55 North Eagleville Road Unit 3060, Storrs, Connecticut 06268, United States.

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|March 26, 2026
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Summary

Researchers developed new silver metal-organic chalcogenolates (MOChas) using functionalized ligands. These materials show unique structures driven by hydrogen bonds, demonstrating a new way to design MOChas with tunable properties.

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Area of Science:

  • Materials Science
  • Crystallography
  • Supramolecular Chemistry

Background:

  • Metal-organic chalcogenolates (MOChas) are hybrid materials with tunable structures and electronic properties.
  • Ligand design is a key strategy for creating novel solid-state topologies in MOChas.

Purpose of the Study:

  • To synthesize and characterize new silver benzenethiolate MOChas with protic functional groups.
  • To investigate the role of ligand functionalization in driving supramolecular organization and inorganic connectivity.
  • To establish a design paradigm for predicting MOChas structures based on ligand identity.

Main Methods:

  • Synthesis of novel silver benzenethiolate MOChas incorporating hydroxy (-OH) and amine (-NH2) ligands.
  • Structural characterization using small molecule serial femtosecond crystallography (smSFX).
  • Computational analysis using density functional theory (DFT) to determine energetic and electronic properties.

Main Results:

  • Two new silver MOChas, m-OH and m-NH2, were synthesized and structurally characterized.
  • Hydrogen-bond-driven supramolecular organization and novel inorganic connectivities were observed.
  • DFT calculations confirmed intermediate energetic and electronic properties for the new materials.
  • The concept of 'supramolecular distortion' was introduced to explain ligand-influenced topological changes.

Conclusions:

  • Ligand identity can predictably influence the inorganic dimensionality of MOChas.
  • Supramolecular interactions play a crucial role in shaping the ground-state architectures of MOChas.
  • This work provides a design paradigm for creating MOChas with tailored structures and properties.