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Coordination number information


In chemistry, crystallography, and materials science, the coordination number, also called ligancy, of a central atom in a molecule or crystal is the number of atoms, molecules or ions bonded to it. The ion/molecule/atom surrounding the central ion/molecule/atom is called a ligand. This number is determined somewhat differently for molecules than for crystals.

For molecules and polyatomic ions the coordination number of an atom is determined by simply counting the other atoms to which it is bonded (by either single or multiple bonds).[1] For example, [Cr(NH3)2Cl2Br2] has Cr3+ as its central cation, which has a coordination number of 6 and is described as hexacoordinate. The common coordination numbers are 4, 6 and 8.

  1. ^ IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) "coordination number". doi:10.1351/goldbook.C01331

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Coordination number

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and materials science, the coordination number, also called ligancy, of a central atom in a molecule or crystal is the number of atoms, molecules or ions...

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Coordination

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construction Coordination complex, consisting of a central atom or ion and a surrounding array of bound molecules or ions Coordination number or ligancy...

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Coordination complex

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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...

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Coordination geometry

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observed. The coordination geometry depends on the number, not the type, of ligands bonded to the metal centre as well as their locations. The number of atoms...

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Coordination polymer

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voids. Coordination polymers are relevant to many fields, having many potential applications. Coordination polymers can be classified in a number of ways...

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Coordination sphere

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In coordination chemistry, the first coordination sphere refers to the array of molecules and ions (the ligands) directly attached to the central metal...

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Tetrahedral molecular geometry

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Tetrahedral molecular geometry Examples CH4, MnO− 4 Point group Td Coordination number 4 Bond angle(s) ≈ 109.5° μ (Polarity) 0...

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Orbital hybridisation

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general chemistry textbooks, hybridization is presented for main group coordination number 5 and above using an "expanded octet" scheme with d-orbitals first...

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Square planar molecular geometry

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Molecules IUMSC – Indiana University Molecular Structure Center Interactive molecular examples for point groups [1] – Coordination numbers and complex ions...

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Mineral

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describing the coordination of the silicate is by a number: in the case of the silica tetrahedron, the silicon is said to have a coordination number of 4. Various...

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National identification number

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or other people with temporary dealings with authorities get a "coordination number" which has 60 added to the date. Registration numbers of Swedish...

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Kissing number

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bulk coordination number of an atom in a crystal lattice in which all atoms have the same size (as in a chemical element). A coordination number of 12...

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Avogadro constant

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value of 6.02214076×1023 mol−1 (reciprocal moles). It is defined as the number of constituent particles (usually molecules, atoms, or ions) per mole (SI...

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Carbenium ion

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covalent bonds, and it bears a +1 formal charge. But IUPAC confuses coordination number with valence, incorrectly considering carbon in carbenium as trivalent...

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Thorium

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oxalate tetrahydrate has coordination number 10, and the borohydride (first prepared in the Manhattan Project) has coordination number 14. These thorium salts...

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Carbon

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depending on coordination number and what the carbon is bonded to. In general, covalent radius decreases with lower coordination number and higher bond...

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Silver

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Silver crystallizes in a face-centered cubic lattice with bulk coordination number 12, where only the single 5s electron is delocalized, similarly to...

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Ligand bond number

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surrounding a metal center, labeled M. More simply, it represents the number of coordination sites occupied on the metal. Based on the covalent bond classification...

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Rutile

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have a coordination number of 6, meaning they are surrounded by an octahedron of 6 oxygen atoms. The oxygen anions have a coordination number of 3, resulting...

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Octahedral molecular geometry

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compounds. His insight allowed chemists to rationalize the number of isomers of coordination compounds. Octahedral transition-metal complexes containing...

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Bethe lattice

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graph, each node is connected to z neighbors; the number z is called either the coordination number or the degree, depending on the field. Due to its...

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Cubic crystal system

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Coordination number (CN) is the number of nearest neighbors of a central atom in the structure. Each sphere in a cP lattice has coordination number 6...

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Crystal structure

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important characteristic of a crystalline structure is its coordination number (CN). This is the number of nearest neighbours of a central atom in the structure...

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Atom

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on the atomic chart, the type of chemical bond, the number of neighboring atoms (coordination number) and a quantum mechanical property known as spin. On...

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