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Acta Crystallogr C Struct Chem. 2018 Oct 1;74(Pt 10):1146-1152. doi: 10.1107/S2053229618012792. Epub 2018 Sep 26.

Syntheses, crystal structures and optical properties of two one-dimensional germanophosphates: HRb3Ge2(HPO4)6 and CsGe(HPO4)2(OH).

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International Joint Research Center for Photoresponsive Molecules and Materials, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, People's Republic of China.
School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore.


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, HRb3Ge2(HPO4)6 (1), and caesium bis(μ-hydrogen phosphato)(μ-hydroxido)germanium, CsGe(HPO4)2(OH) (2), have been prepared by the solvothermal method. Compound 1 shows 1D [Ge(HPO4)6] chains along the c axis formed by GeO6 octahedra and PO4 tetrahedra, with Rb+ cations dissociated between the chains. Compound 2 also exhibits 1D [Ge(HPO4)4(OH)2] chains constructed from adjacent Ge(HPO4)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.


crystal structure; germanophosphate; optical properties; solvothermal method; wide band-gap


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