COMPARATIVE INVESTIGATION OF THE GROUP-6 (CR, MO OR W) METAL-CARBONYL-COMPLEXES OF 1,3,5-TRIAZACYCLOHEXANES

The preparation and characterisation of 1,3,5-trialkyl-1,3,5-triazacyc lohexane complexes of Group 6 metal carbonyls [M(CO)(3)(C3H6N3R3)] (R = Me or Bu-t, M = Mo or W; R = CH2Ph, M = Mo) are reported. The comple xes have been characterised by NMR, IR spectroscopy and mass spectrome try. Their spectroscopic properties and reactivity are discussed and c ompared with those of the corresponding complexes of Cr and analogous 1,4,7-triazacyclononane complexes. The single-crystal structures of th e 1,3,5-tri-tert-butyl-1,3,5-triazacyclohexane adducts with Mo and W h ave been determined.