How to calculate number of metal metal bond in complex?
Answers
Answer:
Subtract this number from n × 18 where n is the number of metals in the complex, that is, (n × 18) – A; say, it is B. (a) B divided by 2 gives the total number of M–M bonds in the complex. (b) A divided by n gives the number of electrons per metal.
Metallic bonding is a type of chemical bonding that rises from the electrostatic attractive force between conduction electrons (in the form of an electron cloud of delocalized electrons) and positively charged metal ions.
By using this rule it is possible to predict the number of ligands in these types of compounds and also the products of their reactions. The EAN rule is often referred to as the “18-electron rule” since, if one counts only valence electrons (6 for Co3+ and 2 × 6 = 12 for 6 NH3), the total number is 18.
Electron donation of common ligands
Some ligands can donate a variable number of electrons. For example, an alkoxide, M-OR, can donate two to six electrons depending on the hybridization of the oxygen atom.
The 16 and 18 Electron Rule.-Two postulates or rules for organometallic com- plexes and their reactions are proposed. 1. Diamagnetic organometallic complexes of transition metals may exist in a significant concentration at moderate temperatures only if the metal's valence shell contains 16 or 18 electrons.