Abstract: Disclosed relates to organic germanium nanocolloids, to which technetium-99m (99mTc), a radionuclide, is labeled, method of the same, and a spleen-imaging agent including the same. According to the invention, 99mTc-labeled organic germanium nanocolloids having high labeling efficiency and stability can be provided. Moreover, since the 99mTc-labeled organic germanium nanocolloids of the invention are accumulated in the spleen considerably higher than the conventional spleen-imaging agent, it is possible to use the 99mTc-labeled organic germanium nanocolloids of the present invention as a therapeutic radiopharmaceutical for the spleen imaging.

Abstract: Disclosed relates to an ionic liquid type crown ether derivative, expressed by Chemical Formula 1 below, for isolating metal ions, a method for preparing the same and a method for isolating selectively the metal ions using the cycle size of the same. The present invention can provide the ionic liquid type crown ether and isolate metal ions including radioactive isotopes efficiently using the same. Furthermore, the prevent invention provides crown ether valuably used as a recyclable and environment-friendly isolating medium by preparing crown ether of ionic liquid type. wherein m, n, X? and R are identical with those in the description.