Structural, optical, and magnetic properties of Na8Eu2(Si2S6)2 and Na8Eu2(Ge2S6)2: Europium(II) quaternary chalcogenides that contain an ethane-like (Si2S6)6− or (Ge2S6)6− moiety

Syntheses and crystal structures of the quaternary thiogermanates Cu4FeGe2S7and Cu4CoGe2S7

“…The title compounds belong to the family of quaternary thiogermanates, which can be constructed from different [Ge x S y ] zbuilding blocks, such as [GeS 4 ] 4À (Aitken et al, 2001) and [Ge 2 S 6 ] 4À (Choudhury et al, 2015). Two GeS 4 tetrahedra can share a corner to create [Ge 2 S 7 ] 6À units, which are featured in the title compounds.…”

Vibration uncoupling of germanium with different valence states lowers thermal conductivity of Cs2Ge3Ga6Se14

“…For instance, the Ge 4+ tends to adopt a tetrahedral coordination with four nearly equidistant Ge-Q (Q = S, Se, Te) bonds [12][13][14][15][16][17][18][19], the Ge 3+ usually forms a Ge-Ge metal bond to fulfill its four coordination and generate the characteristic ethane-like Ge 3+ 2 Q 6 dimer [20][21][22][23][24][25][26][27], and the Ge 2+ is often found in an octahedron with six Ge-Q bonds [27,30]. Various arrangements of these structure building units lead to great diversity of structures [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. Herein, we report a new compound of the Cs 2 Ge 3 M 6 Q 14 (M = Ga, In; Q = Se, Te) family, Cs 2 Ge 3 Ga 6 Se 14 , in which Ge 3+ and Ge 2+ coexist.…”

KEu2In3B12S13: a novel type of thioborate featuring B12S12 cluster and unique In6S6 12-membered ring

“…The Eu/K site exhibits a complex disorder, namely Eu and K atoms cooccupied the same site, and this site was further split to two neighboring sites as suggested, which was conducive to stablizing the structure, as evidenced by the obviously decreased R1 and wR2 values. To the best of our knowledge, this type of alkali-metal and rare-earth metal co-occupying one site is rare, which can be also found in Eu 2 Ge 4 Na 8 S 12 37 and EuLiO 8 W 2 . 38 Due to the Eu/K disorder, the S(3) site surrounding the Eu/K site was also split into S(3A) and S(3B) (details see ESI †).…”