MIXED-LIGAND COMPLEXES OF TECHNETIUM .11. NITRIDOTECHNETIUM COMPLEXES WITH TRIDENTATE AND TETRADENTATE AZOMETHINES - X-RAY MOLECULAR AND CRYSTAL-STRUCTURE OF [N-(2-ETHOXYCARBONYL-3-OXO-BUT-1-EN(1)YL)-2-AMINOPHENOLATO](TRIPHENYL-PHOSPHINE)NITRIDOTECHNETIUM(V), TCN(ECBAP)(PH3P)

Diamagnetic nitridotechnetium(V) complexes with tri- and tetradentate azomethine ligands which possess electron withdrawing groups in their periphery can be prepared starting from TcNCl2(Ph3P)2 or (in the case of the tetradentate ligands) TcNX4- (X = Cl, Br). The products are air stable compounds which have been characterized by elemental analysis, infrared and UV-Vis spectroscopy, NMR and mass spectrometry. The mixed-ligand complex [N-(2-Ethoxycarbonyl-3-oxo-but-1-en(1)yl)-2-aminophenolato](triphenylphosphine)nitridotechnetium(V) (C31H28N2O4PTc, M(r) = 622.5) crystallizes monoclinic in the space group C2/c. The coordination geometry is a distorted square pyramid with the nitrido ligand at the apex.