# What is a coordinate covalent bond?

Feb 26, 2017

A donor bond, in which the two electrons forming the bond formally derive from the ONE atom...............

#### Explanation:

And it is observed in acid-base chemistry, and in coordination chemistry:

$N {H}_{3} + {H}_{2} O \rightarrow N {H}_{4}^{+} + H {O}^{-}$

Ammonia is a fairly weak base, and it is conceived to undergo reaction with water to give ammonium ion, and hydroxide ions.........

Ammonium contains $4 \times N - H$ bonds, all of which cannot be distinguished by symmetry. ONE of the bonds is a coordinate covalent, i.e. a donative bond, in that ONE pair of the 4 bonding electrons derives from the nitrogen lone pair.

Coordination chemistry, the chemistry of transition metal chemistry with various ligand donors is replete with coordinate bonds. Why?

${M}^{n +} + 6 O {H}_{2} \rightarrow {\left[M {\left(O {H}_{2}\right)}_{6}\right]}^{n +}$

Claro?