Editing Boron hydride clusters (section)

===Multicluster boranes===
[[File:GAKFEF.png|thumb|Structure of the conjuncto boron hydride cluster {{chem2|[B19H22]−}}.<ref>{{cite journal |doi=10.1021/ic901976y|title=An Experimental Solution to the "Missing Hydrogens" Question Surrounding the Macropolyhedral 19-Vertex Boron Hydride Monoanion &#91;B19H22&#93;−, a Simplification of its Synthesis, and its Use as an Intermediate in the First Example of syn-B18H22 to anti-B18H22 Isomer Conversion|year=2010|last1=Londesborough|first1=Michael G. S.|last2=Bould|first2=Jonathan|last3=Baše|first3=Tomáš|last4=Hnyk|first4=Drahomír|last5=Bakardjiev|first5=Mario|last6=Holub|first6=Josef|last7=Císařová|first7=Ivana|last8=Kennedy|first8=John D.|journal=Inorganic Chemistry|volume=49|issue=9|pages=4092–4098|pmid=20349936}}</ref>]]
Although relatively rare, several multi-cluster boranes have been characterized. For example, reaction of a borane cluster with {{chem2|B2H6}} (as a source of {{chem2|BH3}}) can lead to the formation of a ''conjuncto''-borane species in which borane cluster sub-units are joined by the sharing of boron atoms.<ref>{{Greenwood&Earnshaw2nd}} p. 162</ref>
:{{chem2|B6H10 + "BH3" → B7H11 + H2}}
:{{chem2|B7H11 + B6H10 → B13H19 + H2}}
Other ''conjuncto''-boranes, where the sub-units are joined by a B-B bond, can be made by ultra violet irradiation of ''nido''-boranes. Some B-B coupled ''conjuncto''-boranes can be produced using {{chem2|PtBr2}} as catalyst.<ref>{{cite journal |last1=Sneddon |first1=L.G. |title=Transition metal promoted reactions of polyhedral boranes and carboranes |journal=Pure and Applied Chemistry |date=2009 |volume=59 |issue=7 |pages=837–846 |doi=10.1351/pac198759070837|s2cid=55817512 |doi-access=free}}</ref>

Analogous to Wade's Rules, electron counting scheme has been developed to predict or rationalize multicluster boranes.
{| class="wikitable"
|+Multi-cluster descriptors<ref>{{cite journal |last1=Bould |first1=Jonathan |last2=Clegg |first2=William |last3=Teat |first3=Simon J. |last4=Barton |first4=Lawrence |last5=Rath |first5=Nigam P. |last6=Thornton-Pett |first6=Mark |last7=Kennedy |first7=John D. |title=An approach to megalo-boranes. Mixed and multiple cluster fusions involving iridaborane and platinaborane cluster compounds. Crystal structure determinations by conventional and synchrotron methods |journal=Inorganica Chimica Acta |date=1999 |volume=289 |issue=1–2 |pages=95–124 |doi=10.1016/S0020-1693(99)00071-7}}</ref>
! Prefix !! Meaning !! Example
|-
| ''klado''- || branched clusters ||
|-
| ''conjuncto''- || conjoined clusters ||
|-
| ''megalo''-|| multiple conjoined clusters ||
|}