in solid byproducts: triphenylphosphine oxide, CO, O2; thermal decompn. (in air or helium stream, 3-4 h, 160°C); sepn. of Rh(bipy)2ClO4 (extn., EtOH; IR spectroscopy), extn. of OPPh3 (ether), sepn. of Rh(CO)(PPh3)2 (extn., CHCl3); DTA monitoring, elem. anal.;