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

Abstract

1,3,5-Tri(4-pentynyl)-1,3,5-triazacyclohexane (tptach), a 1,3,5-triazacyclohexane 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 yield via the reaction of tptach with [CrCl₃(thf)₃]. Structural studies of [CrCl₃(tptach)] and another chromium trihalide–tach adduct, [CrBr₃(tmtach)] (tmtach = 1,3,5-trimethyl-1,3,5-triazacyclohexane), were made.