A short asymmetric hydrogen bond in K4Cu3[AsO4]2[AsO3(OH)]2

Sr3Cu3(PO4)4, Pb3Cu3(PO4)4, BaCu2(PO4)2·H2O, and Ba2Cu(PO4)2·H2O: Crystal Structures and Topological Relationships

“…In all cases the high anisotropy of the displacement parameters were maintained and the R values were not improved significantly. Retaining the symmetry I2/a and an average position for O (4) (4) did not improve the R values but indicate a plausible hydrogen-bonding scheme (for discussion see the next section).…”

“…For details on these hydrogen bonds see (1)(2)(3)(4). In connection with investigations of the stereochemistry of divalent copper atoms systematic syntheses in related chemical systems were performed.…”

Structurally Confined Transition-Metal Oxide Layers, Chains and Oligomers in Molecular and Extended Magnetic Solids

“…Likewise, many minerals exhibit novel structures that contain interesting nanosized Cu−O frameworks. Table lists some examples from a large class of existing compounds as well as some phases newly synthesized in our laboratory. − Figure shows the structure of shattuckite, Cu 5 (SiO 3 ) 4 (OH) 2 , which contains brucite-like (CuO 2 ) n layers built up from edge-shared octahedra . The CuO 6 octahedron adopts the [4 + 2] Jahn−Teller distortion where the two long bonds are 2.59 Å ( k × 2, for Cu(1)), 2.62 Å, and 2.31 Å (P, Q for Cu(2)), much longer than 1.96 Å, 1.98 Å ( i × 2, j × 2), and 1.93−2.05 Å (L∼O) of the four short bonds, respectively.…”