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This yellow volatile solid is a rare example of a molecular binary metal oxide, the other examples being RuO 4, OsO 4, and the unstable Mn 2 O 7. It adopts a centrosymmetric corner-shared bi-tetrahedral structure in which the terminal and bridging Tc−O bonds are 167pm and 184 pm respectively and the Tc−O−Tc angle is 180°.
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4 Tc + 7 O 2 → 2 Tc 2 O 7. It is a molecular metal oxide, analogous to manganese heptoxide. It adopts a centrosymmetric structure with two types of Tc−O bonds with 167 and 184 pm bond lengths. [3] Technetium heptoxide hydrolyzes to pertechnetate and pertechnetic acid, depending on the pH: [4] [5] Tc 2 O 7 + 2 OH − → 2 TcO 4 − + H 2 O ...
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Download QR code; Print/export ... 97 Tc synth 4.21 ... Similarly the dioxide can be produced by reduction of the Tc 2 O 7.
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Pertechnetate can be reduced by H 2 S to give Tc 2 S 7. [13] Pertechnetate is also reduced to Tc(IV/V) compounds in alkaline solutions in nuclear waste tanks without adding catalytic metals, reducing agents, or external radiation. Reactions of mono- and disaccharides with 99m TcO − 4 yield Tc(IV) compounds that are water-soluble. [14]
TC 12: Quantities and units: TC 13: Shaft heights of machinery: Disbanded TC 14: Shafts for machinery and accessories: TC 15: Coupling: Disbanded TC 16: Keys and keyway: Disbanded TC 17: Steel: TC 18: Zinc and zinc alloys: STANDBY TC 19: Preferred numbers: STANDBY TC 20: Aircraft and space vehicles: TC 21: Equipment for fire protection and fire ...