An Indium-Stabilized, Formally Uncharged Te_(10) Molecule with 3-Center-4-Electron Bonding

摘要

In contrast to the lighter homologues sulfur and selenium, molecular allotropes of tellurium are not known. Yet, the crown-shaped Te8 rings in Cs3Te6(Te8)2 and Cs4Te_(20)(Te8) provided first evidence that uncharged tellurium rings can be stabilized in the solid state. Further homonuclear species were reported, such as Te4 in [Te4{Cr(CO)5)4] or Te6 in Re6Te_(10)Cl6-(Te6) and (AgI)2(Te6). Recently, a new binding mode, where formally uncharged tellurium molecules act as electron-pair donors for transition metals, was reported for the coordination polymers [Ru(Te9)](InCl4)2, [Ru(Te8)]Cl2, and [Rh(Te6)]Cl3. A much broader structural chemistry of tellurium is observed in its polyanionic and polycationic forms demonstrating also the ability of Te atoms to feature 3-center-4-electron (3c-4e) bonding.