Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Inorganic Chemistry called The crystal and molecular structure of bis(2,2,6,6-tetramethylheptane-3,5-dionato)nickel(II), Author is Cotton, F. A.; Wise, J. J., which mentions a compound: 14481-08-4, SMILESS is CC(C)(C1=O[Ni+2]2(O=C(C(C)(C)C)[CH-]1)O=C([CH-]C(C(C)(C)C)=O2)C(C)(C)C)C, Molecular C22H38NiO4, Product Details of 14481-08-4.
The crystal and mol. structures of the title compound, also called bis(dipivaloylmethanido)nickel(II), Ni(DPM)2, have been determined in a single crystal x-ray diffraction study. The unit cell is monoclinic (space group P21/a) with a 10.70 ± 0.01, b 10.98 ± 0.02, c 10.39 ± 0.02 A., β 113° 16′ ± 15′, and Z = 2. As expected from earlier studies by C. and Fackler (CA 56, 4352h), the mols. are mononuclear, essentially planar, and centrosym. The Ni-O distances, 1.836 ± 0.005 A., are much shorter than those in a number of complexes in which Ni(II) is octahedrally coordinated by O atoms. This can be explained by the absence of electrons in the antibonding σ-M.O. with dxy symmetry. The orientation of the mols. in the unit cell is fully described for future reference in the reporting of polarized optical absorption studies of this substance and its isomorphous Cu(II) analog.
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Reference:
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