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Speciation of [Cp~*_2M_2O_5] in polar and donor solvents

机译:极性和供体溶剂中[Cp〜* _2M_2O_5]的形态

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The speciation of compounds [Cp~*_2M_2O _5] (M=Mo, W; Cp~*=pentamethylcyclopentadienyl) in different protic and aprotic polar solvents (methanol, dimethyl sulfoxide, acetone, acetonitrile), in the presence of variable amounts of water or acid/base, has been investigated by ~1H NMR spectrometry and electrical conductivity. Specific hypotheses suggested by the experimental results have been further probed by DFT calculations. The solvent (S)-assisted ionic dissociation to generate [Cp~*MO_2(S)]~+ and [Cp~*MO _3]- takes place extensively for both metals only in water/methanol mixtures. Equilibrium amounts of the neutral hydroxido species [Cp~*MO_2(OH)] are generated in the presence of water, with the relative amount increasing in the order MeCN≈acetone
机译:在水量可变的情况下,在质子和非质子极性溶剂(甲醇,二甲基亚砜,丙酮,乙腈)中,化合物[Cp〜* _2M_2O _5](M = Mo,W; Cp ** =五甲基环戊二烯基)的形态或酸/碱,已通过〜1H NMR光谱和电导率进行了研究。实验结果提出的特定假设已通过DFT计算得到了进一步探究。溶剂(S)辅助的离子解离生成[Cp〜* MO_2(S)]〜+和[Cp〜* MO _3]-仅在水/甲醇混合物中对两种金属广泛发生。在水的存在下产生平衡量的中性羟基化合物[Cp〜* MO_2(OH)],相对量按MeCN≈丙酮

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