Abstract
Five-coordinate technetium(V) complexes of the form TcO(L)Cl where L is one of the two tridentate Schiff base ligands N-(2-oxidophenyl)salicylideneiminate or N-(2-mercaptophenyl)salicylideneiminate have been synthesized and characterized. These neutral complexes precipitate from methanol upon reaction of the Schiff base ligand with TcOCl 4 −. A single crystal X-ray structure determination shows that the chloro [[N-(2-oxidophenyl)salicylideneiminato](2−)-N,O,O′]oxotechnetium(V) complex, [TcO(C 13H 9NO 2)Cl], formula weight 362, has a distorted square pyramidal coordination geometry with the oxo ligand in the axial position. The steric requirements of the oxo group cause the Tc atom to be displayed 0.67 Å out of the mean equatorial plane of the other four donor atoms. This complex crystallizes in the monoclinic space group P2 1/a with a = 13.423(6) Å, b = 12.570(5) Å, c = 7.769(3) Å, β = 106.53(5)°, V = 1256.7(9) Å 3, and Z = 4. The structure has been refined to R = 0.047 for 1775 observed reflections.
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