in tetrahydrofuran a soln. of Sn compd. added to a soln. of ligand at room temp.; filtered, crystd. at room temp. for 1 h; elem. anal.;

in tetrahydrofuran a soln. of Sn compd. added to a soln. of ligand at -78°C; filtered, evapd. (vac.), dissolved in MeCN, crystd. at room temp. for 1 h; elem. anal.;