Page 100 - Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005)

IR-6.2 S U B S T I T U T I V E N O M E N C L A T U R E

2.
1
4 2

3

arachno-tetraborane(10), B 4 H 10
The two structures in Examples 1 a nd 2 c an be thought of as related to that of closo-B 6 H 6 2
as follows:
2
1
1
5 2
−BH, −2e − 5 2
+ 4 H
4 3
4 3
6

BH, + 2 H

1
4 2

3

The structures a re obtained f ormally by removal of one (Example 1) or two (Example 2 )
BH groups and the addition of the appropriate n umber of hydrogen atoms.
It should b e n oted that the prefixes nido, arachno, etc. a re not used for the simplest
boranes for which formal derivation from closo parent structures by successive subtractions
might seem to be far-fetched.
Chain compounds may be explicitly specified as such by using the prefix ‘catena’.

Examples:
3.

diborane(6), B 2 H 6

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