Homoleptic

Homoleptic

In inorganic chemistry, a homoleptic chemical compound is a metal compound with all ligands identical. [GoldBookRef | title = homoleptic | file = H02850] The term uses a homo prefix to indicate that something is the same for all.

Examples

* Chromium carbonyl
* Ferrocyanide
* Iron pentacarbonyl
* Nickel carbonyl
* Tetrakis(triphenylphosphine)palladium(0)
* Ferrocene
* Uranium hexafluoride
* tetraethyl lead
* tetramethyl lead
* tetrabutyl tin
* trimethylaluminium
* dimethylmercury
* Diethylzinc
* triethylborane
* Chromate anion
* Permanganate anion
* Iron "tris" 2,2'-bipyridine
* Iron "bis" terpyridine

Some compounds with names that suggest that they are homoleptic are in fact heteroleptic, because they have ligands in them which are not featured in the name. For instance dialkyl magnesium complexes which are found in the equilibrium which exists in a solution of a Grignard reagent in an ether, have two ether ligands attached to each magnesium centre.

Another example is a solution of trimethyl aluminium in an ether solvent (such as THF), similar chemistry should be expected for a triaryl or trialkyl borane.

Any metal species which has more than one type of ligand is heteroleptic

It is possible for some ligands such as DMSO to bind with two or more different coordination modes. It would still be reasonable to consider a complex which has only type of ligand but with different coordination modes to be homoleptic. It is known that ruthenium can bind to DMSO in more than one way, complexes have been isolated in which more than one type of DMSO binding to the same ruthenium centre.

References


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • homoleptic — adjective Describing an organometallic compound having a single type of ligand …   Wiktionary

  • Metal carbonyl — Iron pentacarbonyl An iron atom with five CO ligands Metal carbonyls are coordination complexes of transition metals with carbon monoxide ligands. These complexes may be homoleptic, that is containing only CO ligands, such as nickel carbonyl… …   Wikipedia

  • Cyanometalate — Cyanometallates are a class of coordination compounds, most often consisting only of cyanide ligands.[1] Most are anions. Cyanide is a highly basic and small ligand, hence it readily saturates the coordination sphere of metal ions. The resulting… …   Wikipedia

  • organometallic compound — ▪ chemical compound Introduction  any member of a class of substances containing at least one metal to carbon bond in which the carbon is part of an organic group. Organometallic compounds constitute a very large group of substances that have… …   Universalium

  • Chromium carbonyl — Chembox new Name = Chromium carbonyl ImageFile = Cr(CO)6.png ImageSize = 150px ImageName = IUPACName = hexacarbonylchromium(0) OtherNames = chromium carbonyl Section1 = Chembox Identifiers CASNo = 13007 92 6 RTECS = GB5075000 Section2 = Chembox… …   Wikipedia

  • Tp ligand — In organometallic chemistry, the trispyrazolylborate ligand, often known as Tp, is a scorpionate ligand. By using different pyrazoles, a range of different ligands can be formed.The Tp ligands are usually synthesized by reacting pyrazole with… …   Wikipedia

  • Chromium hexacarbonyl — IUPAC name Hexacarbonylchromium …   Wikipedia

  • Metal nitrosyl complex — Metal nitrosyl complexes are complexes that contain nitric oxide, NO, bonded to a transition metal.[1] Many kinds of nitrosyl complexes are known, which vary both in structure and coligand. Contents 1 Bonding and structure 1.1 Linear vs bent… …   Wikipedia

  • Pentazenium — Other names Pentanitrogen cation Identifiers …   Wikipedia

  • Hydride — In chemistry, a hydride is the anion of hydrogen, H−, or, more commonly, a compound in which one or more hydrogen centres have nucleophilic, reducing, or basic properties. In compounds that are regarded as hydrides, hydrogen is bonded to a more… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”