quadruple bond

Quadruple bonds between atoms of main group elements are unknown.

This species has a quadruple bond between the two tungsten centers.

This dark blue salt is well known as an early example of a compound featuring quadruple bond between its metal centers.

In it the chromium chain contains 4 quadruple bonds.

Although the compound has no practical value, its characterization was significant in opening a new field of research into complexes with quadruple bonds.

This compound can be transformed into MoCl, which also has a quadruple bond.

Typically the ligands that support quadruple bonds are π-donors, not π-acceptors.

A quadruple bond is a type of chemical bond between two atoms involving eight electrons.

Many other compounds with quadruple bonds between transition metal atoms have been described, often by Cotton and his coworkers.

From this data, we can conclude that the bond is a very strong bond or a quadruple bond.

This red-coloured compound features a quadruple bond.

An example of a ditungsten compound with a quadruple bond is di-tungsten tetra(hpp).

However, a recent paper by S. Shaik et al. has suggested that a quadruple bond exists in diatomic carbon.

Molybdenum(II) acetate is an iconic example of a compound with a metal-metal quadruple bond.

The first crystallographic study of a compound with a quadruple bond was provided for salts of ReCl.

Cotton and coworkers proceeded to formulate a molecular orbital rationale for the bonding that explicitly indicated a quadruple bond.

The chromium atoms are joined together by a quadruple bond, and the molecule has D symmetry (ignoring the position of the hydrogen atoms).

Stable quadruple bonds are most common among the transition metals in the middle of the d-block, such as rhenium, tungsten, molybdenum and chromium.

Like chromium and some other transition metals, molybdenum is able to form quadruple bonds, such as in Mo(CHCOO).

The compound was synthesised starting from potassium octachlorodimolybdate (which already contains a Mo quadruple bond) and a lithium amidinate, followed by reduction with potassium graphite:

Some rhenium, molybdenum and chromium compounds contain a quadruple bond, consisting of one sigma bond, two pi bonds and one delta bond.

Quadruple bonds are extremely rare and can be formed only between transition metal atoms, and consist of one sigma bond, two pi bonds and one delta bond.

Octachloridodirhenate(III) is a precursor to other complexes with multiply bonded rhenium centers as the quadruple bond is quite stable and is often maintained in ligand-substitution reactions.

In 1844 he synthesized chromium(II) acetate, which was much later recognized (by F. Albert Cotton in 1964) to be the first chemical compound which contains a quadruple bond.

The resulting bright blue solution is only stable at neutral pH. Many chromous carboxylates are also known, most famously, the red chromous acetate (Cr(OCCH)), which features a quadruple bond.