What type of ligand is cyclopentadiene?

monoanionic ligand
The cyclopentadienyl (Cp) ligand is a monoanionic ligand with the formula C5H5. The first characterized example of a cyclopentadienyl complex was ferrocene, Cp2Fe, which has an iron atom “sandwiched” between two planar Cp rings as shown on the left.

What are metallocenes with examples?

The general name metallocene is derived from ferrocene, (C5H5)2Fe or Cp2Fe, systematically named bis(η5-cyclopentadienyl)iron(II). In metallocene names, the prefix before the -ocene ending indicates what metallic element is between the Cp groups. For example, in ferrocene, iron(II), ferrous iron is present.

Is Cp a neutral ligand?

The Cp or cyclopentadienyl ligand is a polydentate, six-electron L2X ligand. The carbon monoxide ligands are interesting examples of two-electron L-type ligands—notice that the free ligands are neutral, so these are considered L-type!

What is ligand hapticity explain?

Hapticity is the coordination of a ligand to a metal center via an uninterrupted and contiguous series of atoms. The hapticity of a ligand is described with the Greek letter η (‘eta’). For example, η2 describes a ligand that coordinates through 2 contiguous atoms.

What kind of compound is thallium cyclopentadienylthallium?

Cyclopentadienylthallium, also known as thallium cyclopentadienide, is an organothallium compound with formula C 5H 5Tl. This light yellow solid is insoluble in most organic solvents, but sublimes readily. It is used as a precursor to transition metal and main group cyclopentadienyl complexes, as well as organic cyclopentadiene derivatives.

What are the TL angles of cyclopentadienylthallium?

The Tl—Tl—Tl angles are 130°. Upon sublimation, the polymer cracks into monomers of C 5v symmetry. Compared to other cyclopentadienyl (Cp) transfer reagents, such as cyclopentadienyl sodium, CpMgBr and Cp 2 Mg, cyclopentadienylthallium is less air sensitive. It is also much less of a reducing agent.

How is cyclopentadienylthallium different from other transfer reagents?

Applications. Compared to other cyclopentadienyl (Cp) transfer reagents, such as cyclopentadienyl sodium, CpMgBr and Cp 2 Mg, cyclopentadienylthallium is less air sensitive. It is also much less of a reducing agent.

How does cyclopentadienide react with oscl2 N?

Excess sodium cyclopentadienide reacts with [OsCl2 (CO) 3] n or [OsCl 2 (CO) 4] to produce [Os 2 (CO) 4 Cp 2] ( 270 ). 232 Unlike the homologous iron and ruthenium dimers, ( 270) contains only terminal carbonyl ligands. 233,234 Bromine cleaves the Os Os bond to give [OsBr (CO) 2 Cp] ( 271 ). 232