C5H5N in pyridine at 75°C for 8 h under inert atmosphere;; sepn. of Cr(Py)4(PF2)2*2Py, washing (py), concg. of the mother liquor in vacuo, cooling overnight to -26°C, sepn. of (C6H6)2Cr, diluting of the liquor with toluene, filtn., standing of the soln. overnight at -26°C, sepn. of Cr(py)5F2(PF6);