Dipyrimidylamine and tripyrimidylamine as chelating N-donor ligands
摘要:
Dipyrimidylamine (dipm) and tripyrimidylamine (tripm) are reported. A bidentate tripm ruthenium complex, [RuCl(eta (6)-p-cymene)(kappa (2)-tripm)]SbF6, is synthesized and structurally characterized. The presence of an intramolecular C-H . . .N hydrogen bond is proposed between the cymene C-H and a ring nitrogen in an uncoordinated pyrimidine ring. IR data on [Mo(CO)(4)(dipm)] suggest that the Tolman electronic parameter of the dipm ligand is similar to that of 2 x PPh3. M-L bonding may be weaker for pyrimidine versus pyridine because kappa (2)-tripm complexation is apparently more favorable relative to the kappa (3)-form than is the case for tripyridylamine. (C) 2000 Elsevier Science B.V. All rights reserved.