Preparation, characterization, crystal and molecular structure of Na2[N(CH2COO)399Tc(IV) (μ-O)299Tc(IV)N(CH2COO)3] · 6H2O

✍ Scribed by Giorgio Anderegg; Edgar Müller; Kurt Zollinger; Hans-Beat Bürgi

• Publisher: John Wiley and Sons
• Year: 1983
• Tongue: German
• Weight: 330 KB
• Volume: 66
• Category: Article
• ISSN: 0018-019X
• DOI: 10.1002/hlca.19830660528

✦ Synopsis

The title compound and its potassium analog have been prepared from corresponding aqueous solutions of 9 T c 0 , at p H z 2 with SO2 as a reducing agent. An X-ray structure determination of the Na-salt showed Tc coordinated to the tetradentate N (CH,COO)Z-ligand (NTA). Two Tc-NTA moieties are joined via two bridging 0-atoms into a four-membered Tc202 ring. The observed diamagnetism, a strong absorption band at 19 950 cm-l, and a short Tc-Tc distance of 2.363 A are typical for the Tc202-fragment with its strong metal-metal interaction. The structural trans-influence at Tc and the network of H-bonds are consistent with Tc in oxidation state IV.