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- W1982166095 abstract "The binuclear nickel(II) complex of the macrocyclic ligand H2L which contains one N(CH2)2N and one N(CH2)2NH– moiety has been studied. In the mixed spin-state complex [Ni2L][ClO4]2 (1), one nickel center is square-planar (low spin), accommodated by the smaller N2O2 cavity provided by the phenolic oxygens and N(CH2)2N nitrogens; the other nickel center is octahedral (high spin), accommodated by the larger cavity provided by the phenolic oxygens and N(CH2)2NH– nitrogens. Diethylenetriamine takes the skew configuration, which inhibits the full cyclization. This leads to one primary amino nitrogen and one acetyl oxygen on both sides of the octahedral nickel completing the fifth and sixth coordination sites. The Pauling covalent radius of low-spin Ni2+ is ca. 0.20 Å shorter than that of high-spin Ni2+, leading to considerably stronger in-plane ligand-field strength of N2O2 donors at the square nickel(II) relative to that of the octahedral nickel(II). Crystallographic data for (1): space group P-1, triclinic, a=11.573(2) Å, b=15.608(3) Å, c=10.943(2) Å, α=104.54(2)°, β=114.97(1)°, γ=82.62(1)°, Z=2, R=0.061, Rw=0.079." @default.
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- W1982166095 date "1997-07-01" @default.
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- W1982166095 title "Binickel(II) complex of a new asymmetrical acyclic ligand: the X-ray crystal structure of [Ni2L](ClO4)2 reveals alternating square-planar and octahedral nickel ions" @default.
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- W1982166095 doi "https://doi.org/10.1016/s0020-1693(96)05543-0" @default.
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