Group 6 metal complexes of 1,3,5-tri(4-pentynyl)-1,3,5-triazacyclohexane

1,3,5-Tri(4-pentynyl)-1,3,5-triazacyclohexane (tptach), a 1,3,5-triazacyclo hexane ligand with three pendant alkyne groups, was synthesized. The metal tricarbonyl adducts [Cr(CO)(3)(tptach)] and [Mo(CO)(3)(tptach)], featuring a tptach co-ordinated to the metal centre via only the three nitrogen atoms , were prepared by reaction of tptach with reactive sources of "M(CO)(3)". The chromium trichloride adduct [CrCl3(tptach)] was synthesized in low yiel d via the reaction of tptach with [CrCl3(thf)(3)]. Structural studies of [C rCl3(tptach)] and another chromium trihalide-tach adduct, [CrBr3(tmtach)] ( tmtach = 1,3,5-trimethyl-1,3,5-triazacyclohexane), were made.