Coordination in Brucite

What is Brucite

My apologies to all the protein chemist to use an inorganic structure as an example. But as my goal is to give a broader view to the term hydrogen bond, this should be excused.

In addition the brucite structure shows some properties which are not commonly found in organic structures, which are mainly a high symmetry and a small unit cell with not many electrons in it.

Brucite is a mineral and the unit cell is shown below:

Unit cell of Brucit

The unit cell of Brucite, Mg(OH)2 [Zigan, Rothbauer 1967]

The structure is made of Mg layers coordinated octahedral by O-H groups with the hydrogen pointing in the direction of the next layer. A better view of this is given by the mirror-plane diagonal through the unit cell.

Unit cell of Brucit

The diagonal mirror plane through the unit cell of Brucite, Mg(OH)2 [Zigan, Rothbauer 1967]

Weak hydrogen bonds between each layers seem the only possible explanation that the structure is stable, even when this 'hydrogen bonds' lie outside the normal accepted areas (see example 3 in chapter 2).

Brucite has been investigated by all three models described in chapter 3.

Last slide Next slide Back to the first slide

Last Updated: 26 October 1996