Polynitrogen Rocket Fuel

From: sanman (manofsan_at_yahoo.com)
Date: 10/30/04 

Date: 30 Oct 2004 12:13:11 -0700

Look at this page, particularly the 2 bottom-most links:

http://www.dtic.mil/matris/sbir/sttr04/sttr3.html

They mention newly-characterized stable salt compounds containing the
recently developed N5+ cation, which offers a lot of nitrogen in a
small space.

I'd read that N5+ was developed at China Lake, and while it's very
promising for energy density, it was notoriously unstable. But these
new fluoroantimonide salts apparently overcome that problem
effectively.

If the stuff is stable against impact and has temperature stability
upto 70-deg C, then why not design spaceships around this kind of
rocket fuel? But with the fluorine in it, will it pollute?

What is its Isp?