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Pillararene-Based Variable Stoichiometry Co-Crystallization: A Versatile Approach to Diversified Solid-State

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Researchers created novel variable stoichiometry co-crystals using pillararenes and tetracyanobenzene (TCNB). These supramolecular structures exhibit tunable properties and enable vapochromic detection of n-bromoalkanes.

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Area of Science:

  • Solid-state supramolecular chemistry
  • Pillararene chemistry
  • Host-guest complexation

Background:

  • Variable stoichiometry co-crystals are crucial for structure-property relationship studies and synthesizing new scaffolds.
  • Pillararene chemistry offers a versatile platform for supramolecular assembly.
  • Tetracyanobenzene (TCNB) is a common guest molecule in host-guest chemistry.

Purpose of the Study:

  • To extend the concept of variable stoichiometry co-crystals to pillararene chemistry.
  • To construct diverse supramolecular structures in the solid state using pillararenes and TCNB.
  • To explore the physicochemical properties and sensing applications of these novel co-crystals.

Main Methods:

  • Synthesis of variable stoichiometry co-crystals using pillar[n]arenes (n=5,6) and tetracyanobenzene (TCNB).
  • Characterization of co-crystal structures and self-assembled superstructures.
  • Investigation of solid-state physicochemical properties, including color and luminescence.
  • Evaluation of vapochromic sensing capabilities for n-bromoalkanes.

Main Results:

  • Successfully constructed diverse variable stoichiometry co-crystals of pillararenes and TCNB.
  • Observed distinct self-assembled superstructures driven by in-cavity and outside binding interactions.
  • Demonstrated tunable solid-state properties such as color and luminescence.
  • Discovered unique mixed co-crystal systems containing two sets of host-guest complexes.
  • Achieved vapochromic detection of n-bromoalkanes using these pillararene-based co-crystals.

Conclusions:

  • Variable stoichiometry co-crystals provide a rational strategy for constructing diverse supramolecular architectures.
  • Pillararene-TCNB co-crystals exhibit tunable luminescence and color properties.
  • The discovered mixed co-crystal systems are effective for vapochromic sensing of n-bromoalkanes.
  • This work opens new avenues for designing functional solid-state materials with tailored properties.