Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn¡¯t involve a screen. 33100-27-5, 33100-27-5, C10H20O5. A document type is Article, introducing its new discovery.
Electron Spin Resonance Study of Cu(II)-Crown Ether Complexes with 3dZ2 Ground State Doublet in Solution
Copper(II) chloride and crown ethers (12-crown-4, 15-crown-5 and 18-crown-6) formed orange or orange-yellow complexes in dry chloroform.We found that the ESR g-anisotropy of the complexes was greatly dependent on the numbers of donor oxygens and the ring-numbers.The complexes obtained from 12-crown-4 and 18-crown-6 showed g-anisotropy (g<*> above g<*>); these are well characterized by the 3d<*>, or 3dxy ground state.On the other hand, the complexes of 15-crown-5 and its benzo derivatives exhibited the reverse g-anisotropy (g<*> less than g<*>); these are characterized by the 3dz2 ground state with S = 1/2.The electron nuclear dipolar term and the Fermi’s isotropic term were estimated from the ESR parameters based on Bleaney’s calculation.The chlorine superhyperfine splittings were observed in the g<*>-component.The MO bonding parameters were estimated by assuming the compressed octahedral, the trigonal bipyramidal, and pentagonal bipyramidal geometry at the paramagnetic site.The bonding nature was studied on the basis of the observed ligand spin densities.
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Reference£º
Chiral Catalysts,
Chiral catalysts – SlideShare