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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
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Negative Additive Manufacturing of Complex Shaped Boron Carbides
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Carbide complexes as π-acceptor ligands.

Anders Reinholdt1, Johan E Vibenholt1, Thorbjørn J Morsing1

  • 1Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 , Denmark . Email: bendix@kiku.dk ; Tel: +45 35320101.

Chemical Science
|June 5, 2018
PubMed
Summary
This summary is machine-generated.

Terminal carbide complexes act as π-accepting ligands, enabling versatile synthesis of carbide-bridged heterometallic complexes. This study details new complexes and their bonding, revealing carbide

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Terminal carbide complexes are theoretical ligands with predicted π-accepting properties.
  • Understanding their coordination behavior is crucial for designing novel metal complexes.

Purpose of the Study:

  • To experimentally demonstrate the π-accepting character of a terminal ruthenium carbide complex.
  • To establish a synthetic route to carbide-bridged heterometallic complexes.
  • To characterize the structure, reactivity, and electronic properties of these new complexes.

Main Methods:

  • Synthesis of heterobimetallic complexes using [Ru(C)Cl2(PCy3)2] (RuC) and metals from groups 9-11.
  • Spectroscopic (e.g., 13C-NMR) and structural (X-ray diffraction) characterization.
  • Kinetic studies of substitution reactions on Pt(II) by RuC.

Main Results:

  • Successful synthesis of diverse carbide-bridged heterometallic complexes, including a homoleptic complex.
  • Experimental evidence confirms RuC's π-accepting ligand behavior, forming short metal-carbide bonds.
  • RuC exhibits intermediate nucleophilicity and a strong trans influence, acting as a stronger σ-donor than CO.

Conclusions:

  • Terminal carbide complexes are versatile ligands for constructing novel heterometallic structures.
  • The electronic properties of RuC align with strong π-acceptor ligands like carbonyls and nitrides.
  • This work opens avenues for designing advanced materials with tailored electronic and catalytic properties.