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• W2007393275 abstract "Variable-temperature 13C NMR spectroscopy, 1D SPT, and 2D EXSY experiments have been used to investigate the fluxionality of the triangular cluster anion [Re3(μ-H)3(μ-η2-NC5H4)(CO)10]-. The 13CO resonances have been assigned through 1H−13C 2D HMQC and 13C 2D DQF-COSY experiments and through the measurement of the 13CO longitudinal relaxation times. The exchange pattern observed in the 13C 2D EXSY experiments proved the occurrence of a synchronous axial−axial and equatorial−equatorial carbonyl exchange on the apical metal. The rate constants at 303 and 313 K compare well with those previously measured, through 1H NMR spectroscopy, for the exchange of the two hydrides bridging the lateral edges of the cluster. The rigid rotation of the whole apical [H2Re(CO)4] moiety around an axis passing through the midpoint of the basal bimetallic fragment is in agreement with these results. A deuterium kinetic isotope effect kH/kD = 1.45(24) has been measured through 1H and 2H 2D EXSY experiments, supporting the involvement of the hydrides in the rate-determining step of the exchange process." @default.
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• W2007393275 date "1997-06-01" @default.
• W2007393275 modified "2023-10-06" @default.
• W2007393275 title "Metal Fragment Rotation in Triangular Metal Clusters: ¹H, ²H, and ¹³C NMR Studies of the Fluxional Behavior of the Anion [Re₃(μ-H)₃(μ-η²-NC₅H₄)(CO)₁₀]^-" @default.
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• W2007393275 doi "https://doi.org/10.1021/om960875f" @default.
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