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  2. Coordination sphere - Wikipedia

    en.wikipedia.org/wiki/Coordination_sphere

    In crystalline FeSO 4. 7H 2 O, the first coordination sphere of Fe 2+ consists of six water ligands. The second coordination sphere consists of a water of crystallization and sulfate, which interact with the [Fe(H 2 O) 6] 2+ centers. Metal ions can be described as consisting of series of two concentric coordination spheres, the first and second.

  3. Template reaction - Wikipedia

    en.wikipedia.org/wiki/Template_reaction

    The term is mainly used in coordination chemistry. The template effects emphasizes the pre-organization provided by the coordination sphere, although the coordination modifies the electronic properties (acidity, electrophilicity, etc.) of ligands. [1] An early example is the dialkylation of a nickel dithiolate: [2]

  4. Coordination complex - Wikipedia

    en.wikipedia.org/wiki/Coordination_complex

    Cisplatin, PtCl 2 (NH 3) 2, is a coordination complex of platinum(II) with two chloride and two ammonia ligands.It is one of the most successful anticancer drugs. A coordination complex is a chemical compound consisting of a central atom or ion, which is usually metallic and is called the coordination centre, and a surrounding array of bound molecules or ions, that are in turn known as ligands ...

  5. Macrocyclic ligand - Wikipedia

    en.wikipedia.org/wiki/Macrocyclic_ligand

    In coordination chemistry, a macrocyclic ligand is a macrocyclic ring having at least nine atoms (including all hetero atoms) and three or more donor sites that serve as ligands. [1] Crown ethers and porphyrins are prominent examples. Macrocyclic ligands often exhibit high affinity for metal ions, the macrocyclic effect.

  6. Shilov system - Wikipedia

    en.wikipedia.org/wiki/Shilov_system

    Shilov cycle The overall charge is omitted from the complexes since the exact coordination sphere of the active species is unknown.. The Shilov system is a classic example of catalytic C-H bond activation and oxidation which preferentially activates stronger C-H bonds over weaker C-H bonds for an overall partial oxidation.

  7. Coordination geometry - Wikipedia

    en.wikipedia.org/wiki/Coordination_geometry

    The coordination geometry of an atom is the geometrical pattern defined by the atoms around the central atom. The term is commonly applied in the field of inorganic chemistry, where diverse structures are observed. The coordination geometry depends on the number, not the type, of ligands bonded to the metal centre as well as their locations.

  8. Ligand cone angle - Wikipedia

    en.wikipedia.org/wiki/Ligand_cone_angle

    In coordination chemistry, the ligand cone angle (θ) is a measure of the steric bulk of a ligand in a transition metal coordination complex. It is defined as the solid angle formed with the metal at the vertex of a cone and the outermost edge of the van der Waals spheres of the ligand atoms at the perimeter of the base of the cone.

  9. Ligand - Wikipedia

    en.wikipedia.org/wiki/Ligand

    In coordination chemistry, a ligand [a] is an ion or molecule with a functional group that binds to a central metal atom to form a coordination complex. The bonding with the metal generally involves formal donation of one or more of the ligand's electron pairs , often through Lewis bases . [ 1 ]