“…The representatives of this group are numerous minerals which structures are described in terms of different coordination of fragments {M 4 O} (M = Cu, Pb, Ln, Bi, Hg) bearing molecular (0D) or oligomeric structures as well as infinite coordination motifschains (1D), layers (2D), as well as framework structures (3D) [59]. On the other side, M2 and C, as well as a few of the related compounds [33,34], possess a more complex fragment, {M 4 O(Q 2 ) 4 } (Q 2 for dichalcogenide ligand), which can be considered as a structural building block. The similar building blocks are also observed in various oxochalcohalides of 3-6 period transition elements with molecular structure Ti 4 OS 8 Hal 6 (Hal = Cl [35], Br [36]), Ti 4 OSe 8 Br 6 [60], as well as with chain structure M 4 OTe 9 I 4 (M = Ti [37], Nb [38], Ta [39]).…”