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CRYSTAL STRUCTURE OF BIS(2-AMINOETHYL)AMINE(DI-2-PYRIDYLAMINE)ZINC(II)NITRATE AND THE ELECTRONIC PROPERTIES OF THE COPPER(II)-DOPED SYSTEM
The crystal structure of the title compound 2 has been determined by X-ray crystallographic analysis using photographic data.The complex crystallises in the monoclinic space group P21/c, with a=12.34(5), b=16.26(5), c=9.92(5) Angstroem, beta=92.0(5)o, and Z=4.The zinc(II) ion is five-co-ordinate with a distorted trigonal-bipyramidal stereochemistry, the mean out-of-plane and in-plane Zn-N bond distances being 2.20 and 2.09 Angstroem respectively.The e.s.r. and electronic spectra of 1percent copper-doped 2 have been determined using polycrystalline samples and single-crystal techniques and the results interpreted to suggest that the stereochemistry of the doped CuN5 chromophore corresponds closely to that observed in the isomorphous 2 complex, rather than to the stereochemistry of the ZnN5 chromophore of the host lattice.Caution is expressed over the use of the Zn-N distances and N-Zn-N angles to describe the stereochemistry of the CuNx chromophore when doped into isomorphous zinc(II) complexes as host lattices and the use of the electronic reflectance spectra of copper(II)-doped zinc(II) complexes as a criterion for comparable stereochemistries is advocated.A comparison of the g and A factors and one-electron orbital energies is made with other very distorted copper(II) systems.
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Reference£º
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics