Electron spin resonance studies of nanocrystalline SnO_(2) indicated that the experimental spectrum can be decomposed into two spectra attributed to crystalline and interfacial components respectively.The results conf...Electron spin resonance studies of nanocrystalline SnO_(2) indicated that the experimental spectrum can be decomposed into two spectra attributed to crystalline and interfacial components respectively.The results confirmed the proposed two components model of nanocrystalline materials.展开更多
The X-ray crystal structures of(NH4)2(15-crown-5)3[Cu(mnt)2](1)and(NH4)2(benzo-15-crown-5)4-[Cu(mnt)2]ident to 0.5H2O(2)were determined.Two single crystals arecomposed of distinct structures of ammonium-crown ether su...The X-ray crystal structures of(NH4)2(15-crown-5)3[Cu(mnt)2](1)and(NH4)2(benzo-15-crown-5)4-[Cu(mnt)2]ident to 0.5H2O(2)were determined.Two single crystals arecomposed of distinct structures of ammonium-crown ether supramolecular cation and[Cu(mnt)2]^(2-)anion.The triple-decker dication in complex 1 and a sandwich dimmer in complex 2 wereobserved.X-Band EPR studies on the single crystals of both complex 1 and complex 2 have been carriedout at room temperature,which revealed that complex 2 showed a perfect hyperfine structure of Cuwhereas that of complex 1 could not be observed.The principal values and direction cosines of theprincipal axes of the g and A tensors were computed by a least-squares fitting procedure.The spindensity of Cu(ll)was estimated according to the principal values of the A tensors and compared wellwith the results calculated based on DFT method.展开更多
文摘Electron spin resonance studies of nanocrystalline SnO_(2) indicated that the experimental spectrum can be decomposed into two spectra attributed to crystalline and interfacial components respectively.The results confirmed the proposed two components model of nanocrystalline materials.
基金Supported by the National Natural Science Foundation of China(Grant No.20490218)
文摘The X-ray crystal structures of(NH4)2(15-crown-5)3[Cu(mnt)2](1)and(NH4)2(benzo-15-crown-5)4-[Cu(mnt)2]ident to 0.5H2O(2)were determined.Two single crystals arecomposed of distinct structures of ammonium-crown ether supramolecular cation and[Cu(mnt)2]^(2-)anion.The triple-decker dication in complex 1 and a sandwich dimmer in complex 2 wereobserved.X-Band EPR studies on the single crystals of both complex 1 and complex 2 have been carriedout at room temperature,which revealed that complex 2 showed a perfect hyperfine structure of Cuwhereas that of complex 1 could not be observed.The principal values and direction cosines of theprincipal axes of the g and A tensors were computed by a least-squares fitting procedure.The spindensity of Cu(ll)was estimated according to the principal values of the A tensors and compared wellwith the results calculated based on DFT method.
