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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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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.
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New copper coordination polymers (CPs) and molecular complexes were synthesized using thiobenzamide and its dithio analog. Some CPs exhibited tunable luminescence and semiconductivity, showing potential for sensing volatile organic vapors.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Copper halides (CuX) are versatile precursors for coordination chemistry.
  • Thiobenzamide (TBA) and 1,4-dithiobenzamide (DTBA) are organic ligands with potential coordinating abilities.
  • Coordination polymers (CPs) and molecular complexes offer diverse structural motifs and properties.

Purpose of the Study:

  • To synthesize and characterize novel coordination polymers and molecular complexes using copper halides and thiobenzamide derivatives.
  • To investigate the structural diversity and properties of the resulting copper-iodide and copper-bromide compounds.
  • To explore the potential applications of these materials in sensing technologies.

Main Methods:

  • Direct reactions of copper halides (CuBr, CuI) with thiobenzamide (TBA) and 1,4-dithiobenzamide (DTBA) under ambient conditions.
  • Isolation and characterization of one-dimensional (1D) and two-dimensional (2D) coordination polymers, as well as molecular complexes.
  • Recrystallization techniques to obtain solvated species.
  • Investigation of luminescence and electrical semiconductivity properties.
  • Theoretical calculations to rationalize observed electronic properties.

Main Results:

  • Formation of 1D CPs ([CuI(TBA)]n, [Cu3I3(TBA)2]n, [CuBr(TBA)]n) and molecular complexes ([CuI(TBA)3], [Cu2I2(TBA)4]·2MeCN).
  • Isolation of isostructural 1D CP solvated species ([CuI(TBA)·S]n, [CuBr(TBA)·S]n) and 2D CPs ([CuI(DTBA)·S]n).
  • Observed variable luminescence and electrical semiconductivity in solvated 1D CPs (1·S and 5·S) dependent on solvent molecules.
  • Demonstrated potential for sensing volatile organic vapors through significant changes in emission upon solvent exposure.

Conclusions:

  • The reaction conditions and ligand choice influence the formation of diverse copper coordination architectures.
  • Solvated coordination polymers exhibit tunable photophysical and electronic properties.
  • These materials show promise for developing naked-eye sensors for volatile organic vapors.
  • Theoretical studies support the understanding of their electronic behavior.