Which is the stronger bond in diborane, B2H6: the terminal B−H bond, or the bridging μ2−BH bonds?
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You have a
3-centre-2 electron
bond bridging the borane nuclei.........versus a
2-centre-2 electron bond
in the terminal
B
−
H
bonds. A priori, would we not expect the latter to be stronger? In
H
2
B
(
μ
2
−
H
)
2
B
H
2
the terminal hydride bonds are also shorter than the bridging bonds. Anyway, you are going have to find a text that reports the respective bond-strengths...as a physical scientist you are obliged to quote them.
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