J. Baldas et al., PREPARATION AND STRUCTURE OF [(TC(V)N(THIOUREA))(4)(EDTA)(2)].6H2O - THE FIRST EXAMPLE OF A CYCLIC NITRIDO-BRIDGED TETRAMERIC TECHNETIUM COMPLEX, Journal of the Chemical Society, Chemical Communications, (18), 1994, pp. 2153-2154
The complex [{TcN(thiourea)}(4)(edta)(2)].6H(2)O has been prepared and
is shown to consist of a cyclic tetrameric Tc4N4 configuration with f
our asymmetrical Tc drop N-Tc bridges; each diagonal pair of Tc atoms
is bridged by an edta(4-) ligand and Tc drop N distances range between
1.681(7) and 1.695(7) Angstrom, with N-Tc of 1.977(7) to 2.009(7) Ang
strom.