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, HRbGe(HPO) (1), and caesium bis(μ-hydrogen phosphato)(μ-hydroxido)germanium, CsGe(HPO)(OH) (2), have been prepared by the solvothermal method. Compound 1 shows 1D [Ge(HPO)] chains along the c axis formed by GeO octahedra and PO tetrahedra, with Rb cations dissociated between the chains. Compound 2 also exhibits 1D [Ge(HPO)(OH)] chains constructed from adjacent Ge(HPO)(OH) octahedra, with Cs cations dissociated between the chains. XRD, TGA, IR and UV-Vis-NIR absorption spectra are presented and discussed for both compounds.
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