Coordination cage

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In chemistry, a coordination cage is a type of coordination compounds with cavities that can engage in host-guest chemistry. They usually consist of several metal centres linked with organic ligands.[1][2]


Metallaprisms are a popular kind of coordination cage. In these compounds, six metal centres are linked with ligands to form an array of approximate D3h symmetry. They typically have conformationally-flexible cavities into which a variety of guest molecules bind.


The synthesis of some metallaprisms starts with [(η6-p-cymene)6Ru63-tpt-κN)2(μ-C6HRO4- κO)3]6+ using the linker of 2,4,6-tri(pyridine-4-yl)-1,3,5-triazine (tpt). Various guest molecules have been encapsulated in the hydrophobic cavity of metallaprisms. A few examples of guests are bioconjugate derivatives, metal complexes, and nitroaromatics.[3]


  1. ^ Fujita, Makoto; Tominaga, Masahide; Hori, Akiko; Therrien, Bruno (2005). "Coordination Assemblies from a Pd(II)-Cornered Square Complex". Accounts of Chemical Research. 38: 369–378. doi:10.1021/ar040153h. 
  2. ^ Ward, Michael D. "Polynuclear coordination cages". Chemical Communications. 2009: 4487–4499. doi:10.1039/B906726B. 
  3. ^ Severin, Kay. "Supramolecular chemistry with organometallic half-sandwich complexes". Chemical Communications. 2006: 3859–3867. doi:10.1039/B606632C.