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Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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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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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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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...

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T-shaped platinum boryl complexes: synthesis and structure.

Holger Braunschweig1, Krzysztof Radacki, Katharina Uttinger

  • 1Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland,Würzburg, Germany. h.braunschweig@mail.uni-wuerzburg.de

Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 30, 2008
PubMed
Summary

New platinum-boryl complexes were synthesized and studied. Their structure and reactivity were analyzed, revealing the significant trans-influence of boryl ligands on platinum chemistry.

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Inorganic Chemistry

Background:

  • Platinum complexes with boryl ligands are of interest due to their unique electronic properties.
  • Understanding the trans-influence of these ligands is crucial for predicting reactivity.

Purpose of the Study:

  • To synthesize and characterize novel cationic T-shaped 14-electron platinum-boryl complexes.
  • To investigate the correlation between the trans-influence of boryl moieties and platinum-ligand bond distances.
  • To explore the reactivity of these complexes with Lewis bases and their behavior in halide abstraction reactions.

Main Methods:

  • Synthesis of platinum-boryl complexes via halide abstraction.
  • X-ray diffraction studies for structural elucidation.
  • Reactions with Lewis bases to probe chemical reactivity.

Main Results:

  • A series of cationic platinum-boryl complexes were successfully synthesized.
  • X-ray diffraction revealed a subtle correlation between boryl trans-influence and Pt-H/Pt-C separations.
  • No significant agostic C-H interactions were observed.
  • The complex trans-[(Cy3P)2Pt(BCat)]+ reacted with Lewis bases, demonstrating the influence of boryl ligands on reactivity.
  • A borylene species was formed from the reaction of trans-[(Cy3P)2Pt(Br)(B(Br)Mes)] with K[B(C6F5)4].

Conclusions:

  • The trans-influence of boryl ligands significantly impacts the structure and reactivity of platinum complexes.
  • The synthesized complexes offer a platform for further studies in organometallic chemistry and catalysis.