A new two-dimensional layered germanate with in situ embedded carbon dots for optical temperature sensing

A new germanate |H-2(C4N3H13)|(3)[ Ge7O14.5F2][ Ge7O14F3]center dot 2.5H(2)O (denoted as JLG-16) has been synthesized by using diethylenetriamine as the structure-directing agent under solvothermal conditions. Single-crystal structural analysis reveals that JLG-16 crystallizes in the monoclinic space group C2/c with a = 38.2008(15) angstrom, b = 8.8262(4) angstrom, c = 31.1789(13) angstrom, and beta = 108.5470(10)angstrom. Its structure is made up of 4and 5-coordinated Ge7 clusters. The alternating connection of 4-and 5-coordinated Ge-7 clusters gives rise to a double-layered structure with 16-and 10-ring channels and a low framework density (11.2 Ge per 1000 angstrom(3)). Carbon dots (CDs) formed in the mother liquid are in situ embedded into the JLG-16 crystals during the solvothermal crystallization process. The resulting CDs@ JLG-16 composite thus exhibits excitation-dependent and temperature-responsive photoluminescence performances, which makes it possible to be used in optical temperature sensing.