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Preparation, characterization, crystal and molecular structure of Na 2 [N(CH 2 COO) 3 99 Tc(IV) (μ‐O) 2 99 Tc(IV)N(CH 2 COO) 3 ] · 6H 2 O
Author(s) -
Anderegg Giorgio,
Müller Edgar,
Zollinger Kurt,
Bürgi HansBeat
Publication year - 1983
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19830660528
Subject(s) - chemistry , crystallography , crystal structure , diamagnetism , aqueous solution , metal , oxidation state , x ray crystallography , stereochemistry , diffraction , physics , organic chemistry , optics , quantum mechanics , magnetic field
The title compound and its potassium analog have been prepared from corresponding aqueous solutions of 99 TcO 4 −;at pH ≈ 2 with SO 2 as a reducing agent. An X‐ray structure determination of the Na‐salt showed Tc coordinated to the tetradentate N(CH 2 COO) 3 3−ligand (NTA). Two Tc‐NTA moieties are joined via two bridging O‐atoms into a four‐membered Tc 2 O 2 ring. The observed diamagnetism, a strong absorption band at 19 950 cm −1 , and a short Tc‐Tc distance of 2.363 Å are typical for the Tc 2 O 2 ‐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.