The Crystal Structure of 2,2'-Bipyridinium(1+) mu-Hydrogen-bis[(2,2'-bipyridine)oxodiperoxovanadate](1-)-x-hydrogen peroxide-(6-x)-water, (Hbipy)[H{VO(O2)2bipy}2].xH2O2.(6-x)H2O, x ~= 0.5, at -100 degrees C.