in methanol AgBr (0.755 mmol) added to soln. of C6H2(NC(NMe2)2)4 (0.151 mmol), stirred for 2 h at room temp.; soln. filtered, concd., Et2O added, ppt. sepd.; elem. anal.;

in methanol AgCl (0.934 mmol) added to soln. of C6H2(NC(NMe2)2)4 (0.188 mmol), stirred for 2 h at room temp.; soln. filtered, concd., Et2O added, ppt. sepd.; elem. anal.;