in tetrahydrofuran (N2); soln. of Fe complex (2 equiv.) and Sb ligand in THF was stirred atroom temp. for 2 d; filtered; volatiles removed (vac.);

in chloroform under Ar, Ni complex in CHCl3 mixed at 0°C with stibane ligand (molar ratio 1:1), stirred for 10 min; filtered, to filtrate added ether, solid washed with ether, dried in vac., elem. anal.;