Syntheses, crystal structures and optical properties of two one‐dimensional germanophosphates: HRb 3 3 Ge 2 2 (HPO 4 4 ) 6 6 and CsGe(HPO 4 4 ) 2 2 (OH)

摘要

Germanophosphates, as a young class of metal phosphates, have been less reported but might possess more diverse structural types and potential applications. Here, two one‐dimensional (1D) alkali‐metal germanophosphates (GePOs), namely, hydrogen hexakis(μ‐hydrogen phosphato)digermaniumtrirubidium, HRb 3 Ge 2 (HPO 4 ) 6 ( 1 ), and caesium bis(μ‐hydrogen phosphato)(μ‐hydroxido)germanium, CsGe(HPO 4 ) 2 (OH) ( 2 ), have been prepared by the solvothermal method. Compound 1 shows 1D [Ge(HPO 4 ) 6 ] ∞ chains along the c axis formed by GeO 6 octahedra and PO 4 tetrahedra, with Rb + cations dissociated between the chains. Compound 2 also exhibits 1D [Ge(HPO 4 ) 4 (OH) 2 ] ∞ chains constructed from adjacent Ge(HPO 4 ) 4 (OH) 2 octahedra, with Cs + cations dissociated between the chains. XRD, TGA, IR and UV–Vis–NIR absorption spectra are presented and discussed for both compounds.