in tetrahydrofuran; dichloromethane a soln. of HgCl2 in THF was added to a soln. of the ligand in CH2Cl2 (molar ratio HgCl2:P=1:2); the soln. was reduced in vol. and a small amt. of Et2O was added to ppt. the complex; recrystn. from CH2Cl2/Et2O; elem. anal.;