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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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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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An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum...
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Peraryl Arsoles: Practical Synthesis, Electronic Structures, and Solid-State Emission Behaviors.

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New tetraaryl-1-phenylarsoles exhibit aggregation-induced emission (AIE), emitting strongly in solid states but weakly in solution. These compounds show tunable optical properties and form luminescent gold complexes with mechanochromic behavior.

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Area of Science:

  • Organometallic Chemistry
  • Materials Science
  • Photophysics

Background:

  • Aggregation-induced emission (AIE) is a phenomenon where molecules become highly emissive in the aggregated or solid state, contrasting with traditional fluorophores that suffer from aggregation-caused quenching.
  • Arsole derivatives are organometallic compounds containing a five-membered ring with one arsenic atom, offering unique electronic and structural properties.

Purpose of the Study:

  • To synthesize novel peraryl arsoles and investigate their photophysical properties, particularly aggregation-induced emission (AIE).
  • To explore the influence of aryl substituents on the electronic structure and luminescence of arsole derivatives.
  • To synthesize and characterize a gold(I) chloride complex of a pentaphenylarsole and study its luminescent and mechanochromic properties.

Main Methods:

  • Synthesis of 2,3,4,5-tetraaryl-1-phenylarsoles using diiodophenylarsine and zirconacyclopentadienes.
  • Characterization of optical and electronic properties using experimental techniques and computational methods.
  • Synthesis of a gold(I) chloride complex with 1,2,3,4,5-pentaphenylarsole and investigation of its luminescent mechanochromism.

Main Results:

  • Synthesized peraryl arsoles displayed significant AIE, with high solid-state quantum yields (up to 0.61) and weak solution emission.
  • Aryl group substitution at the 2,5-positions modulated frontier orbitals and arsole core aromaticity, while 1,3,5-position substituents restricted aggregation-caused quenching.
  • The synthesized gold(I) chloride complex exhibited a blue-shifted emission compared to the ligand and displayed luminescent mechanochromism, changing emission color upon grinding.

Conclusions:

  • Tetraaryl-1-phenylarsoles are promising AIE-active materials with tunable properties based on aryl substitution.
  • The low aromaticity of the arsole moiety facilitates coordination with metal ions, leading to functional complexes.
  • The gold(I) complex demonstrates potential for applications in sensing or stimuli-responsive materials due to its luminescent mechanochromism.