The Kläui ligand is the anion
−. The
ligand
In coordination chemistry, a ligand is an ion or molecule ( 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 elec ...
, popularized by
Wolfgang Kläui, binds metals and
metalloids via a facial O
3 donor set. Related
tridentate and
tripodal anionic ligands include
trispyrazolylborates.
:
160px, General structure of a metal center coordinated to a κ3-Kläui ligand.
The ligand is derived from the cationic complex of
trimethylphosphite 2+ via an
Arbuzov reaction Arbuzov (masculine, russian: Арбузов) or Arbuzova (feminine, russian: Арбузовa) is a Russian surname, derived from the word арбуз (''arbooz'', meaning "watermelon"). It may refer to:
* Aleksandr Arbuzov (1877–1968), Russian and ...
. Using other
phosphite
The general structure of a phosphite ester showing the lone pairs on the P
In organic chemistry, a phosphite ester or organophosphite usually refers to an organophosphorous compound with the formula P(OR)3. They can be considered as esters of a ...
s and other
cyclopentadienyl ligands, a large variety of derivatives are possible. The parent acid H is highly soluble in water (270 g/100 mL). Its p''K''
a is about 2. Many complexes have been described, including bis(
chelate
Chelation is a type of bonding of ions and molecules to metal ions. It involves the formation or presence of two or more separate coordinate bonds between a polydentate (multiple bonded) ligand and a single central metal atom. These ligands are ...
) complexes of the type {M
(C5H5)Co[(CH3O)2POsub>3}
2.html" ;"title="CH
3O)
2PO.html" ;"title="(C
5H
5)Co[(CH
3O)
2PO">(C
5H
5)Co[(CH
3O)
2POsub>3}
2">CH
3O)
2PO.html" ;"title="(C
5H
5)Co[(CH
3O)
2PO">(C
5H
5)Co[(CH
3O)
2POsub>3}
2sup>n+ (M = Co(II), Mn(II), Bi(III), etc.).
[Wolfgang Kläui, Heiko Otto, Werner Eberspach, Elke Buchholz "Die Michaelis-Arbusov-Reaktion als Zugang zu neuen Sauerstoff-Tripodliganden des Typs [C5R5M{P(O)(OCH3)2}3]−. Ligandfeldspektroskopische und koordinationschemische Charakterisierung der Liganden" Chemische Berichte 1982, Volume 115, Pages 1922–1933. ]
References
{{DEFAULTSORT:Klaui Ligand
Organocobalt compounds
Half sandwich compounds
Cyclopentadienyl complexes
Phosphites
Tripodal ligands
