Technetium dimers

Technetium-99m bicisate is a brain imaging agent that is used for localization of stroke. The lyopbilized kit contains ethyl cysteine dimer as the active ingredient. 

Thus, the SCF-Xa-SW calculations for the metal dimers confirm the anomaly of the technetium clusters that was experimentally observed in previous studies [9-11], It should be noted that because the actual structure of the... 

The above-reported data lead to the conclusion that the HOMO in [Tc6(/j-Br)6Br6]Br2] 3- is the a i-MO composed mainly of 5s(5p,)- and 4dz2-AO s of technetium and having 2bonding character with respect to short M-M bonds. In other words, the EHT calculations [106,107,113] overestimate the interaction of <5 - and n -MO s of dimers in the horizontal directions and underestimate the participation of 5s- and 5pz-AO s in the formation of M-M bonds [15,142],... 

Chromatography cyclophosphazenes, 21 46, 59 technetium, 11 48-49 Chromites, as spinel structures, 2 30 Chromium, see Tetranuclear d-block metal complexes, chromium acetylene complexes of, 4 104 alkoxides, 26 276-283 bimetallics, 26 328 dimeric cyclopentdienyl, 26 282-283 divalent complexes, 26 282 nitrosyls, 26 280-281 trivalent complexes, 26 276-280 adamantoxides, 26 320 di(/ >rt-butyl)methoxides, 26 321-325 electronic spectra, 26 277-279 isocyanate insertion, 26 280 substitution reactions, 26 278-279 [9]aneS, complexes, 35 11 atom... 

Frozen-solution ESR spectra of Tc2G in mixed aqueous hydrochloric acid and ethanol provided data consistent with equal coupling of the unpaired electron to both technetium nuclei (101). IsotopicaUy pure "Tc (/ = 9/2) in 99Tc2Cl leads to a large number of lines in the X-band spectrum owing to second-order effects, in addition to the hyperfine lines presence for this dimeric axially symmetric system. The Q-band spectrum obtained at 77°K with a microwave frequency of 35.56 GHz exhibited fewer lines, and computer-simulated spectra were generated to correspond to the experimental spectrum withgit = 1.912, gi = 2.096, An = 166 x 10 4 cm"1, IAL = 67.2 x 10 4 cm 1, and gav = 2.035. 

Berrouschot J, Barthel H, von Kummer R et al (1998) 99m technetium-ethyl-cysteinate-dimer single-photon emission CT can predict fatal ischemic brain edema. Stroke 29 2556-2562... 

---