The crystal structure of monoclinic Ag5Cu3(PO4)2[(PO4)H(PO4)]and its relationship to the triclinic sodium analogue

Abstract

The crystal structure of Ag 5 Cu 3 (P04)2[(P04)H(P0 4 )] was determined from 2611 single crystal X-ray data [a = 17.725(6) A ,b = 5.162(2) A, c = 18.584(6) Α, β = 125.66(2)°, space group C2/c, Z = 4,R W = 0.032, sin0/ λ < 0.80 A' 1 ]. (One part of the P0 4 tetrahedra form dimers via a symmetrically restricted, very short Ο -Η-Ο bond of 2.428(6) A). Simultaneously this hydrogen bond is a common edge between two coordination polyhedra of Ag atoms. The Cu(l) atom is in a square planar [4] environment. The Cu(2) atom is tetragonal pyramidal [5] coordinated with an uncommon distribution of Cu-O bond lengths [1.933(2), 1.934(2), 1.976(2), 2.105(2) and 2.180(2) A]. Monoclinic AgsCujiPO^zKPO^HiPO^] has topologi-cal^ the same [Cu 3 (P0 4 ) 4 ] 2~ layers as triclinic NajCuatXO^KXCMH-(X0 4 )] (X = P, As), but a different stacking sequence. In both cases these layers are connected by hydrogen bonds and by Na and Ag atoms, respectively, to a three-dimensional network structure.

Enhancing Oxygen Evolution Catalytic Performance of Nickel Borate with Cobalt Doping and Carbon Nanotubes

“…X‐ray diffraction (XRD) studies reveal orthorhombic unit cells for CoNi 2 B 2 O 6 and Co 2 NiB 2 O 6 , which match with Ni 3 B 2 O 6 (ICDD 75–1809) and Co 3 B 2 O 6 (ICDD 75–1808) (Figure 1). [31] Each metal site is surrounded by an oxygen atom of planar borate groups to afford an octahedral environment. Infrared studies also confirm the presence of borate groups in powder samples.…”