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- W2090040612 abstract "The complexes fac-[ReX(CO)3(BIP)] (X = Cl, Br or I; BIP = 2,6-bis[(1-phenylimino)ethyl]pyridine) have been synthesised and characterised as involving BIP as a bidentate chelate ligand. In solution the ligand exists in three conformational forms, namely E,E- and both distal and proximal E,Z-isomers. 2D-EXSY NMR has been used to measure 1,4-metallotropic shifts of the ReX(CO)3 moiety between equivalent E,E forms, E,Z-isomerisation of the pendant imine function and restricted C-C rotation of the pendant arm of the BIP ligand. Activation energies ΔG≠ (298.15 K) for all these processes are of comparable magnitude, in the range 79–88 kJ mol−1, and are essentially halogen independent. Restricted rotation of the phenyl ring attached to the Re-coordinated nitrogen was also detected with ΔG≠ = 67.3 ± 0.2 kJ mol−1. A crystal structure of fac-[ReBr(CO)3(BIP)] confirms the E-conformation of the pendant imine function with its N atom cis to the pyridyl nitrogen." @default.
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- W2090040612 date "1997-06-01" @default.
- W2090040612 modified "2023-09-24" @default.
- W2090040612 title "Stereochemically non-rigid transition metal complexes of 2,6-bis[(1-phenylimino)ethyl]pyridine (BIP) Part 2. Dynamic NMR studies of fac-[ReX(CO)3(BIP)] (X = Cl, Br, or I). Crystal structure of fac-[ReBr(CO)3(BIP)]" @default.
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- W2090040612 doi "https://doi.org/10.1016/s0022-328x(96)06933-1" @default.
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