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The interchange of bridging and terminal ligands is called bridge-terminal exchange. The process is invoked to explain the fluxional properties of metal carbonyl and metal isocyanide complexes. [6] Some complexes that exhibit this process are cobalt carbonyl and cyclopentadienyliron dicarbonyl dimer: Co 2 (μ-CO) 2 (CO) 6 ⇌ Co 2 (μ-CO) 2 (CO ...
a) Doubly bridging and b) terminal oxo ligands. A transition metal oxo complex is a coordination complex containing an oxo ligand. Formally O 2–, an oxo ligand can be bound to one or more metal centers, i.e. it can exist as a terminal or (most commonly) as bridging ligands. Oxo ligands stabilize high oxidation states of a metal. [1]
Usually binucleating ligands feature bridging ligands, such as phenoxide, pyrazolate, or pyrazine, as well as other donor groups that bind to only one of the two metal ions. Some ligands binucleating ligands are symmetrical, which facilitates the formation of homobimetallic complexes.
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 ...
Phosphates exist in many condensed oligomeric forms. Many of these derivatives function as ligands for metal ions. Pyrophosphate (P 2 O 4− 7) [7] and trimetaphosphate ([P 3 O 9] 3−) have been particularly studied. They typically function as bi- and tridentate ligands. Structure of [(C 6 H 6)Ru(P 3 O 9)] −. Color code: red = O, violet = P ...
A bridging ligand links two or more metal centers. Virtually all inorganic solids with simple formulas are coordination polymers, consisting of metal ion centres linked by bridging ligands. This group of materials includes all anhydrous binary metal ion halides and pseudohalides. Bridging ligands also persist in solution.
In the predominant isomers of this complex, the two Fe centers are joined not only by an Fe–Fe bond, but also by bridging CO ligands. The related cyclopentadienylruthenium dicarbonyl dimer features an unsupported Ru–Ru bond. Many metal clusters contain several supported M–M bonds. Further examples are Fe 3 (CO) 12 and Co 4 (CO) 12.
Structure of Nb 2 Cl 6 (SMe 2) 3, illustrating a bridging thioether. [9] Unlike ethers, thioethers occasionally serve as bridging ligands. The complexes Nb 2 Cl 6 (SMe 2) 3 is one such example. It adopts a face-sharing bioctahedral structure with a Nb(III)=Nb(III) bond