Search results
Results From The WOW.Com Content Network
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 ]
In almost all complexes, phen serves as a bidentate ligand, binding metal centers with the two nitrogen atoms. Examples include PtCl 2 (phen) and [Fe(phen) 3 ] 2+ . Homoleptic complexes
The bent NO ligand is sometimes described as the anion, NO −. Prototypes for such compounds are the organic nitroso compounds, such as nitrosobenzene. A complex with a bent NO ligand is trans-[Co 2 (NO)Cl] +. The NO − is also common for alkali-metal or alkaline-earth metal-NO molecules. For example. LiNO and BeNO bear Li + NO − and Be ...
Download as PDF; Printable version; In other projects ... −1 +5 17 118 oganesson: Og ... ag ah ai aj ak al am an ao ap aq ar as at au av aw ax ay az ba bb bc bd be ...
For the purpose of electron-counting, C-bonded acyl ligands count as 1-electron ligands, akin to pseudohalides. η 2-Acyl ligands count as 3-electron "L-X" ligands. bridging acyl ligands are also well known, where the carbon bonds to one metal and the oxygen bonds to a second metal. One example is the bis(μ-acetyl) complex [(CO) 3 Fe(C(O)CH 3 ...
Compounds that obey the 18-electron rule are typically "exchange inert". Examples include [Co(NH 3) 6]Cl 3, Mo(CO) 6, and [Fe(CN) 6] 4−.In such cases, in general ligand exchange occurs via dissociative substitution mechanisms, wherein the rate of reaction is determined by the rate of dissociation of a ligand.
Typical examples of this type of complex are group 14 metal complexes such as CpSiMe 3. An example of both is (Cp 2 Fe(CO) 2). It is probable that η 1-Cp complexes are intermediates in the formation of η 5-Cp complexes. Still rarer, the Cp unit can bond to the metal via three carbons. In these η 3-Cp complexes, the bonding resembles that in ...
The number of coordination bonds (coordination number) can vary from two in K[Ag(CN) 2] as high as 20 in Th(η 5-C 5 H 5) 4. [ 2 ] One of the most common coordination geometries is octahedral , where six ligands are coordinated to the metal in a symmetrical distribution, leading to the formation of an octahedron if lines were drawn between the ...