Coordination Complexes

Also called

coordination compounds · coordination complex · ligand · central metal ion · coordination number · octahedral complex · tetrahedral complex · square planar complex · crystal field splitting · d-orbital splitting · t2g and eg · colour of complexes · cisplatin · cis and trans isomers · EDTA · chelate · haemoglobin · chlorophyll · Werner theory · उपसहसंयोजन यौगिक · लिगैंड · कीलेट

Topics

• A coordination compound has a central metal ion bonded to ligands, atoms or groups that donate a lone pair.
• The coordination number is the number of ligand donor atoms bonded to the metal: 6, 4 or 2 are common.
• Six ligands give an octahedral shape; four give either a tetrahedron or a square plane.
• In a complex the five d-orbitals split: in an octahedral field three (t2g) lie lower and two (eg) higher, by Δ₀.
• A complex is coloured because an electron absorbs light of energy Δ₀ to jump the gap; we see the other colours.
• Cisplatin, [Pt(NH₃)₂Cl₂], has cis and trans isomers; the cis form is an anti-cancer drug.
• EDTA is a hexadentate chelating ligand: two N and four O donors wrap one metal ion in a ring.
• Haem in haemoglobin is an iron complex that carries O₂; chlorophyll is a magnesium complex that traps light.

About this model

A GLB file of about 416 KB, shown in Lably's 3D viewer and, on a phone, placed in your room with AR. Credit: Model, science and animation: Lably (built procedurally with three.js; no downloaded meshes). | CC BY 4.0. Original geometry and animation made for Lably.

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