Structural Studies of Technetium Complexes. XI. The Crystal Structure of Bis(tetraphenylarsonium) Bis(1,2-dicyanoethenedithiolato)nitridotechnetate(V)

Abstract

The crystal structure of [AsPh₄]₂ [ TcN(mnt)₂] ( mnt = 1,2-dicyanoethenedithiolate) has been determined by single-crystal X-ray diffraction methods at 21 ± 1 C. Crystals are monoclinic, space group Pn , with a 11 369(2), b 15.530(2), c 14.421(3) Å , P 97.58(2)º, and Z 2. Full-matrix least-squares refinement gave a final R value of 0.057 for 4232 independent reflections. The technetium atom in the [TcN( mnt )₂]^2- anion has square-pyramidal coordination geometry with the nitrido ligand in the apical position, Tc =N 1.59(1) Å , and four Tc -S bonds with distances varying between 2.367(4) and 2.419(4) Å. The Tc =N core is disordered about a pseudo-inversion centre, but unequal occupancies of the disordered sites preclude a centrosymmetric structure.