【摘 要】
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The ability of several ab initio models to predict experimental 29Si-NMR chemical shift is examined. The shielding values of trimethylsilyl chloride (A), t-
【出 处】
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Journal of Ocean University of Qingdao
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The ability of several ab initio models to predict experimental 29Si-NMR chemical shift is examined. The shielding values of trimethylsilyl chloride (A), t-butyldimethylsilyl chloride (B) and allyltrimethylsilane (C) are calculated by GIAO , CSGT and IGAIM methods, using HF/6-31G*, B3LYP/6-31G*, HF/6-311+G **, B3LYP/6-311+G ** and MPW1PW91/6-311+G ** models respectively. The 29Si chemical shifts calculated by GIAO method using HF/6-311+G ** model are highly in agreement with those obtained experimentally. All of the models above reproduce the trends of chemical shifts in all cases studied, suggesting that the models are of practical value.
The ability of several ab initio models to predict experimental 29Si-NMR chemical shifts is examined. The shielding values of trimethylsilyl chloride (A), t- butyldimethylsilyl chloride (B) and allyltrimethylsilane (C) are calculated by GIAO, CSGT and IGAIM methods, using HF / 6-31G *, B3LYP / 6-31G *, HF / 6-311 + G **, B3LYP / 6-311 + G ** and MPW1PW91 / 6-311 + G ** models respectively. The 29Si chemical Theses calculated by GIAO method using HF / 6-311 + G ** model are highly in agreement with those obtained experimentally. All of the models above reproduce the trends of chemical shifts in all cases studied, suggesting that the models are of practical value.
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