Pentaborane and oxygen difluoride-specific impulse?

[penlu]

It's said almost everywhere you search through that a mix of pentaborane-9 and oxygen difluoride would provide the highest rocket specific impulse. Is this true? If so, what would the specific impulse be?

 

[tblaxland]

It's said almost everywhere you search through that a mix of pentaborane-9 and oxygen difluoride would provide the highest rocket specific impulse. Is this true? If so, what would the specific impulse be?

Some good data here:
http://en.wikipedia.org/wiki/Liquid_rocket_propellants#Bipropellants

LOX/LH2: Ve = 4462 m/s
OF2/B5H9: Ve = 4239 m/s

These data are predictions though, not test results and are based on a range of assumptions. For example F2/H2/Li is listed as 5050 m/s but elsewhere you find data stating that it has been tested at over 5300 m/s.