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- W2040541563 abstract "The biruthenocenyl complex, 1,2-dimethyl-diruthenocenyl-ethylene, [Ru(C10H9)CCH3]2, has been synthesized through the use of low-valent titanium induced reactions. Spectroscopic characterizations reveal two steric isomers that can be separated by appropriate recrystallization and column chromatography. The X-ray analysis of the E-isomer showed the crystal belongs to the triclinic system, space group P1, with unit-cell dimensionsa = 5.891(4), b = 9.061(6), c = 9.210(5) Å, α = 99.91(1), β = 101.25(1), γ = 96.77(1)°, Dcalc = 1.821 g cm−3 and Z = 1. The Z-isomer crystallizes in the monoclinic system, space group P21/c with unit-cell dimensions a = 11.561(9), b = 9.820(2), c = 16.573(8) Å, β = 93.18(4)°, Dcalc = 1.819 g cm−1 and Z = 4. Kinetics of isomerization from E to Z were studied in 1,1,2,2-tetrachloroethane-d2 via NMR. Activation parameters are: ΔH+0 = 19.8 ± 1.1 Kcal mol−1, ΔS+0 = −15 ± 4 eu. The low enthalpy of activation and the large and negative entropy of activation for the rotation around the ethylenic double bond are consistent with π-complex formation of ruthenocene moieties with halocarbon solvents." @default.
- W2040541563 created "2016-06-24" @default.
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- W2040541563 date "1997-12-01" @default.
- W2040541563 modified "2023-10-09" @default.
- W2040541563 title "Syntheses, structures and kinetics of E–Z isomerisms of 1,2-dimethyl-diruthenocenyl-ethylene" @default.
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- W2040541563 doi "https://doi.org/10.1016/s0020-1693(97)05535-7" @default.
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