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This invention relates to novel cationic crown-ether containing metal complexes, methods of preparing the cationic crown-ether containing metal complexes, and radiopharmaceutical compositions comprising the cationic crown-ether containing metal complexes. This invention relates to cationic crown-ether containing 99m Tc complex radiopharmaceuticals for diagnosis of cardiovascular disorders and cancer. This invention further relates to cationic crown-ether containing 186/188 Re complex radiopharmaceuticals for radiotherapy of cardiovascular disorders and cancer.