in neat (no solvent) byproducts: CO, CO2, Hg; heated in sealed ampule at 200°C for 17 h; further by-products are Cr, Cr(CO)6; Ph2Hg; sublimated, cooled with liquid N2, extd.(benzene), sublimated at 80°C (0.01 Torr), chromy. (Al2O3, acetone), IR, NMR;