Chemiluminescence during thermal degradation of sodium persulfate in the presence of terbium sulfate: 2. The effect of water of crystallization

Two Three-Dimensional Lanthanide Frameworks Exhibiting Luminescence Increases upon Dehydration and Novel Water Layer Involving in Situ Decarboxylation

“…When B continued to lose residual water molecules (C), the luminescence intensity continues to increase, while the peaks do not move. So, it is found that a decrease in the number of water molecules in samples is accompanied by an increase in luminescence intensity, which is accordant with terbium sulfate hydrate reported by Mamykin et al, 31 but it is different from the Tb 3+ complex reported by Gao et al 18 in which a decrease of luminescence when it is dehydrated might relate to the amorphous feature of the dehydrated phases, where the surrounding of Tb 3+ ion becomes soft. In this work, the loss of two uncoordinated water molecules does not change the framework of the complex, so its perfect crystallinity can be preserved, as indicated by comparing their PXRD patterns to the as-prepared ones ( Figure 15).…”

A hexagonal C3-symmetric (H2O)7 guest fits well into a C3-symmetric terbium complex cavity

“…When the water molecules are driven off, the luminescence intensity increases while the peaks do not move. The luminescence of the completely dehydrated samples is greater than those of the crystal hydrate containing 6.5 water molecules, which is accordant with terbium sulfate hydrate reported by Mamykin et al [18] but different from one Tb 3+ complex reported by Gao et al, [19] in which, the decrease of luminescence when dehydrated might relate to the amorphous feature of the dehydrated phases, where the surrounding of Tb 3+ ion becomes soft. In this paper, the loss of the water doesn't change the framework of the complex, so its perfectly stiff crystallinity can be held, and the absence of water may reduce energy loss by radiation decay.…”