[Ge 4 O 6 Te 4 ] 4— , an Adamantanoid Oxotellurido Germanate(IV) with a Central Ge 4 O 6 Core

[Mn(en) 3 ] 2 [Ge 4 O 6 Te 4 ]·1.5en ( 1 ) and (enH) 3 [Mn(en) 3 ] 3 [Ge 4 O 6 Te 4 ] 2 I·4.7en ( 2 ) may be prepared at 150 °C by solvothermal reaction of elemental Ge and Te with Mn(OOCCH 3 ) 2 ·4H 2 O in the presence of [CH 3 ) 4 N]I as a mineralizer in respectively superheated ethylenediamine (en) or an en/CH 3 OH (3:2) mixture. Both contain the novel [Ge 4 O 6 Te 4 ] 4— anion with a central adamantanoid Ge 4 O 6 core and four terminal Te atoms and represent the first examples of such a mixed [M 4 E 6 E 4 ′] 4— anion (M = Si‐Sn; E = O‐Te). As a result of their increased polarity, the Ge‐Te bonds of 2 are markedly shorter (2.438 — 2.462Å) than those previously reported for telluridogermanates(IV).