145056-13-9Relevant academic research and scientific papers
Metal-?-Complexes of Benzene Derivatives, XL. Selenium in the Periphery of Bis(benzene)chromium: Synthesis, Stuctural Dynamics, and Redox Behavior of a New Hetera--chromocyclophane
Elschenbroich, Christoph,Burdorf, Heike,Burdorf, Helmut,Mahrwald, Dagmar,Metz, Bernhard
, p. 1157 - 1164 (2007/10/02)
Lithiation of bis(benzene)chromium and subsequent reaction with Ph2Se2 or Se and CH3I, respectively, afforded the complexes (PhSe-η6-C6H5)2Cr (6) and (MeSe-η6-C6H5)2Cr (8), the latter being convertible into interannularly bridged (MeSe-η6-C6H5)2Cr (9 - 11, M = Cr, Mo, W). According to the 1H NMR spectroscopy, 9 undergoes both bridge inversion and reversal, the former displaying spectral coalescence at 283 K (ΔGc(excit.) = 55.9 kJ mol-1) whereas the latter is still rapid at 200 K.Substitution of H for -SeMe and addition of Cr(CO)4 unit effect anodic shifts of the redox potential E1/2 (+/0) of 95 mV/SeMe and 230 mV/Cr(CO)4.Despite electron donation from the bis(arene)metal backbone 8 is fairly weak ligand, cleavage of the interannular bridge occuring with the half life τ1/2 = 41.4 min (9 --> 8) and τ1/2 = 5.8 s (9+ --> 8+) as inferred from cyclic voltammetry in DME at 293 K. η6-Selenoanisole Complexes, Selena--chromocyclophanes, Pyramidal Inversion at Se, Cyclic Voltammetry
