Aluminosilicate Relatives: Chalcogenoaluminogermanates Rb<sub>3</sub>(AlQ<sub>2</sub>)<sub>3</sub>(GeQ<sub>2</sub>)<sub>7</sub> (Q = S, Se) Alexander Rothenberger Maryam Shafaei-Fallah Mercouri G. Kanatzidis 10.1021/ic101627v.s002 https://acs.figshare.com/articles/journal_contribution/Aluminosilicate_Relatives_Chalcogenoaluminogermanates_Rb_sub_3_sub_AlQ_sub_2_sub_sub_3_sub_GeQ_sub_2_sub_sub_7_sub_Q_S_Se_/2718481 The new compounds Rb<sub>3</sub>(AlQ<sub>2</sub>)<sub>3</sub>(GeQ<sub>2</sub>)<sub>7</sub> [Q = S (<b>1</b>), Se (<b>2</b>)] feature the 3D anionic open framework [(AlQ<sub>2</sub>)<sub>3</sub>(GeQ<sub>2</sub>)<sub>7</sub>]<sup>3−</sup> in which aluminum and germanium share tetrahedral coordination sites. Rb ions are located in channels formed by the connection of 8, 10, and 16 (Ge/Al)S<sub>4</sub> tetrahedra. The isostructural sulfur and selenium derivatives crystallize in the space group <i>P</i>2<sub>1</sub>/<i>c</i>. <b>1</b>: <i>a</i> = 6.7537(3) Å, <i>b</i> = 37.7825(19) Å, <i>c</i> = 6.7515(3) Å, and β = 90.655(4)°. <b>2</b>: <i>a</i> = 7.0580(5) Å, <i>b</i> = 39.419(2) Å, <i>c</i> = 7.0412(4) Å, β = 90.360(5)°, and <i>Z</i> = 2 at 190(2) K. The band gaps of the congruently melting chalcogenogermanates are 3.1 eV (<b>1</b>) and 2.4 eV (<b>2</b>). 2010-11-01 00:00:00 isostructural sulfur eV germanium share tetrahedral coordination sites Aluminosilicate Relatives Rb ions Se 3 D selenium derivatives band gaps