The title complex [ErY(Gly)_6(H_2O)4](ClO_4)_6·51H_2O has been synthesized.Its crystal structure has been determined by X-ray diffraction method.The crystal is triclinic with space group P.The unit cell parameter...The title complex [ErY(Gly)_6(H_2O)4](ClO_4)_6·51H_2O has been synthesized.Its crystal structure has been determined by X-ray diffraction method.The crystal is triclinic with space group P.The unit cell parameters are as follows:a=1.1518(4) nm,b=1.4105(7) nm,c=1.5530(6) nm,α=96.61(3)°,β=102.74(3)°, γ=105.70(3)°,V=2.3277(17) nm^3,Z=2,D_(calc)=2.091 g/cm^3.The structure has been refined to a final R of 0.0785.The crystal-is an infinite chain complex,in which four carboxyl groups from glycine molecules bridge the Er^(3+) and Y^(3+) ions,and the other two carboxyl groups bridge two adjacent Er^(3+) or Y^(3+) ions.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The Project supported by the National Natural Science Foundation of China
文摘The title complex [ErY(Gly)_6(H_2O)4](ClO_4)_6·51H_2O has been synthesized.Its crystal structure has been determined by X-ray diffraction method.The crystal is triclinic with space group P.The unit cell parameters are as follows:a=1.1518(4) nm,b=1.4105(7) nm,c=1.5530(6) nm,α=96.61(3)°,β=102.74(3)°, γ=105.70(3)°,V=2.3277(17) nm^3,Z=2,D_(calc)=2.091 g/cm^3.The structure has been refined to a final R of 0.0785.The crystal-is an infinite chain complex,in which four carboxyl groups from glycine molecules bridge the Er^(3+) and Y^(3+) ions,and the other two carboxyl groups bridge two adjacent Er^(3+) or Y^(3+) ions.
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-
