In recent years, a great deal of interest has been focused on nitrogen-containing extractants for the separation of actinides from lanthanides. In this study, we synthesized a polyazamacrocycle-type C8-cyclen ligand c...In recent years, a great deal of interest has been focused on nitrogen-containing extractants for the separation of actinides from lanthanides. In this study, we synthesized a polyazamacrocycle-type C8-cyclen ligand comprising four tertiary alkyl amino groups, for the extraction of Am3+ and Eu3+. The C8-cyclen demonstrated a weak ability to extract and separate Am3+ and Eu3+ that increased with the increasing "softness" of the aqueous anions. The extraction behavior of Am3+ and Eu3+ indicated coordination interactions between the C8-cyclen and the Am3+ and Eu3+ ions. The suppression of Am3+ or Eu3+ extraction by acid depended on the media anions involved.展开更多
The development of nuclear magnetic resonance (NMR) imaging as a clinical diagnostic modality has promoted the need for a new class of pharmaceuticals. These drugs would be administered to a patient to enhance the ima...The development of nuclear magnetic resonance (NMR) imaging as a clinical diagnostic modality has promoted the need for a new class of pharmaceuticals. These drugs would be administered to a patient to enhance the image contrast between the normal and diseased tissues. The image intensity in ~1HNMR imaging, composed of the NMR signals of water protons, is dependent on the nuclear relaxation times. Complexes of paramagnetic transition and lanthanide ions, which can decrease the relaxation times of nearby nuclei via dipolar interactions, have received much attention as the potential con-展开更多
基金supported by the National Natural Science Foundation of China(91226110)the Program for Changjiang Scholars and Innovative Research Team in University
文摘In recent years, a great deal of interest has been focused on nitrogen-containing extractants for the separation of actinides from lanthanides. In this study, we synthesized a polyazamacrocycle-type C8-cyclen ligand comprising four tertiary alkyl amino groups, for the extraction of Am3+ and Eu3+. The C8-cyclen demonstrated a weak ability to extract and separate Am3+ and Eu3+ that increased with the increasing "softness" of the aqueous anions. The extraction behavior of Am3+ and Eu3+ indicated coordination interactions between the C8-cyclen and the Am3+ and Eu3+ ions. The suppression of Am3+ or Eu3+ extraction by acid depended on the media anions involved.
基金Project supported by the National Natural Science Foundaion of China.
文摘The development of nuclear magnetic resonance (NMR) imaging as a clinical diagnostic modality has promoted the need for a new class of pharmaceuticals. These drugs would be administered to a patient to enhance the image contrast between the normal and diseased tissues. The image intensity in ~1HNMR imaging, composed of the NMR signals of water protons, is dependent on the nuclear relaxation times. Complexes of paramagnetic transition and lanthanide ions, which can decrease the relaxation times of nearby nuclei via dipolar interactions, have received much attention as the potential con-
