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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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Electronic Delocalization in Coordination Polymers Based on Bimetallic Carboxylates.

María Ana Castro1, Adrián E Roitberg2, Fabio D Cukiernik1

  • 1INQUIMAE, Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina.

Journal of Chemical Theory and Computation
|November 20, 2015
PubMed
Summary

Researchers explored electron delocalization in diruthenium tetracarboxylate coordination polymers. Tetrazine-linked diruthenium(II,II) complexes showed the most promising electron delocalization, confirmed by synthesis and spectroscopy.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Coordination polymers based on diruthenium tetracarboxylates are investigated for their electronic properties.
  • The bridging ligand's role in mediating electron delocalization between diruthenium centers is crucial.
  • Understanding electron coupling is key to designing functional materials.

Purpose of the Study:

  • To computationally evaluate the influence of different bridging ligands on electron delocalization in diruthenium tetracarboxylate coordination polymers.
  • To identify the most efficient nitrogenated axial ligand for mediating electron coupling between diruthenium centers.
  • To synthesize and characterize the most promising candidate compound.

Main Methods:

  • Density Functional Theory (DFT) calculations at B3LYP, PBE0, and m06 levels.
  • Molecular Orbital (MO) fragments decomposition and broken symmetry approach.
  • Analysis of Ru-N distances, HOMO-LUMO gaps, HOMO/LUMO compositions, and magnetic coupling constants (J).

Main Results:

  • Computational parameters indicated that tetrazine (tz) as a bridging ligand in Ru2(II,II) coordination polymers facilitates significant electron delocalization.
  • The synthesized Ru2(II,II)-tetrazine compound exhibited spectral features consistent with predicted electron delocalization.
  • An intense low-energy MLCT band was observed, assigned to the Ru2(II,II) → tz electron transfer process.

Conclusions:

  • Tetrazine is identified as a highly effective bridging ligand for promoting electron delocalization in diruthenium tetracarboxylate frameworks.
  • The study validates the computational approach for predicting electron delocalization efficiency in coordination polymers.
  • The synthesized material demonstrates potential for applications requiring efficient electron transfer.