Complexes containing nitrosyl or thionitrosyl ligands

The nitrosyl-hydrido complex [Tc(NO)(PPh3)3(H)2]° was synthesized by refluxing a mixture of [Tc (NO)(PPh)3Cl3]°, PPh3 and Na[BIl4] in absolute ethanol. I he diamagnetic, bright yellow precipitate was characterized spectroscopically. In the IR (NO) appeared at 1636 cm, v(Tc-H) at 1733 cm and 1185 cm. The H NMR in 

C6D5CD3 showed hydride resonances at 3= -1.5 ppm and S= -3.45 ppm. The hydride ligands arc labile [6131. 

A Dictiloro-/ae/-tris(4-mcthylpyridiiie)-thionitrosyl-technt tium(I), [Tc(NS)C l (picofj] [615]- 

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