The Crystal Structure of Ditechnetium Decacarbonyl

Complexes of technetium(I) (99Tc, 99mTc) pentacarbonyl core with π-acceptor ligands (tert-butyl isocyanide and triphenylphosphine): Crystal structures of [Tc(CO)5(PPh3)]OTf and [Tc(CO)5(CNC(CH3)3)]ClO4

“…The structures of [Tc(CO) 5 [25]. It is interesting that the equatorial and axial Tc-CO bond lengths in the complexes with PPh 3 and TBI differ insignificantly, in contrast to [TcI(CO) 5 ] studied in [26], in which the difference between the axial and equatorial (mean) Tc-CO bond lengths is about 0.1 Å .…”

Preparation and structure of technetium triphosphide and rhenium triphosphide, isotypic polyphosphides with metal chains

“…The Tc-Tc bond length of 3.092 (1)/k and the Re-Re bond length of 3.122 (2)A (this distance is equivalent to the b axis) seem rather long at first sight, but one has to keep in mind that it is the result of a compromise involving considerable deviations from ideal octahedral and tetrahedral bond angles as has been discussed above. Rather long Tc-Tc and Re-Re bonds of 3.036 (6) and 3.02 (1)A also occur in the molecules Tc2(CO)I 0 (Bailey & Dahl, 1965) and Re2(CO)I 0 (Dahl, Ishishi & Rundle, 1957) where the metal-metal bonding is undisputable. In TcP4 (Riihl, Jeitschko & Schwochau, 1982) and ReP 4 (Jeitschko & Rfihl, 1979) the Tc-Tc (3.002A) and Re-Re bonds (3.012A) are shorter because the TcP 6 and ReP6 octahedra need to distort only towards one side to form the metal-metal pairs.…”

New Organometallic Technetium Complexes in High and Low Oxidation States

“…A second reason is the difficulty in synthesizing homoleptic Tc-carbonyls, the most useful and common starting material for the development of low valency Tc-complexes. Literature routes end up with often poor yield [11,12] and safety reasons are a hinderance to high pressure reactions with radioactive material. By lowering COpressure we were able to synthesize selectively and in high yield a reactive Tc(I)-cluster.…”