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- W2073254237 abstract "Abstract The ability of three center chelating ligands to form dichromium units and to enforce short and very short CrCr contacts is examined in a consistent series of cyclohexyl amidinate chromium complexes, with the aim of understanding the factors intrinsic in the nature of the bridging ligands which are able to promote or disfavor dinuclear aggregation and to determine the extent of intermetallic separation. The present study describing the crystal structures of the dinuclear [(CyNC(H)NCy)2Cr]2·C7H8 (1) and mononuclear (CyNC(CH3)NCy)2Cr (2), {CyNC[Ph(o-CH2NMe2)]NCy}2Cr·2THF (3) and [(Me3Si)NC(Ph)N(SiMe3)]2Cr (4) indicates that the steric interaction between the lateral cyclohexyl and the central amidinate group is capable of determining the nuclearity (monomeric versus dimeric) and probably the extent of intermetallic separation. Crystal data are as follows. 1: C52H84N8Cr2·toluene, M=1017.41, monoclinic, P21/c, a=13.682(5), b=17.446(3), c=24.521(3) A, β=90.02(5)°, V=5853(3) A3, Z=4, T=−30 °C, Mo Kα, R=0.104, Rw=0.077 for 4030 reflections out of 10319 unique; 2: C28H50N4Cr, M=494.73, orthorhombic, Pnma, a=8.104(1), b=26.572(4), c=12.533(2) A, V=2699(1) A3, Z=4, T=−157 °C, Mo Kα, R=0.054, Rw=0.069 for 1580 reflections out of 2752 unique; 3: C44H68N6Cr·2THF, M=853.16, triclinic, P 1 , a=12.293(5), b=20.437(5), c=11.071(4) A, α=94.55(3), β=111.72(3), γ=73.86(3)°, V=2481(1) A3, Z=2, T=−157 °C, Mo Kα, R=0.093, Rw=0.081 for 6492 reflections out of 8710 unique." @default.
- W2073254237 created "2016-06-24" @default.
- W2073254237 creator A5051790115 @default.
- W2073254237 creator A5063225492 @default.
- W2073254237 creator A5063317439 @default.
- W2073254237 creator A5089784885 @default.
- W2073254237 date "1993-11-01" @default.
- W2073254237 modified "2023-09-26" @default.
- W2073254237 title "Ligand steric bulk: A neglected factor in the formation of CrCr supershort contacts" @default.
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- W2073254237 doi "https://doi.org/10.1016/s0020-1693(00)83815-3" @default.
- W2073254237 hasPublicationYear "1993" @default.
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