MIXED-LIGAND COMPLEXES OF TECHNETIUM .13. A NEW AND FACILE SYNTHESIS, STRUCTURE AND ELECTROCHEMICAL BEHAVIOUR OF TRANS-[TC(DPPE)(2)(BU(T)NC)(2)](PF6)CENTER-DOT-ETHANOL (DPPE=BIS(DIPHENYLPHOSPHINO)ETHANE, BU(T)NC=TERT-BUTYLISOCYANIDE)

摘要

The Tc(I) mixed-ligand complex, trans-[Tc(dppe)(2)(bu(t)NC)(2)](PF6) (dppe=bis(diphenylphosphino)ethane, bu(t)NC=tert-butyl-isocyamide) has been prepared from [Tc(tu-S)(6)(3+)(tu-S=thiourea) and a mixture of both ligands. The compound crystallizes triclinic in the space group P (1) over bar (a=9.999(5), b=12.059(5), c=13.776(7) Angstrom, alpha=113.55(2), beta=92.18(3), gamma=101.50(3)degrees, Z=1). The technetium atom has a slightly distorted octahedral coordination sphere with the isocyanide ligands in trans-position to each other. By cyclic voltammetry, at a Pt electrode, trans-[Tc(dppe)(2)(bu(t)NC)(2)](PF6) undergoes a single electron reversible oxidation at E(1/2)(ox)=0.91 V versus SCE. [References: 23]