Abstract
AbstractSecondary 13C/12C isotope effects (Δδi) over one bond on the 119Sn nuclear shielding have been determined for 42 organotin compounds. Changes in the magnitude and sign of Δδi are related to the nature of the carbon atom and the nature of the other substituents at the tin atom. In addition to the rotational and vibrational effects connected with the Sn13C bond itself, Δδi is affected by the bonding of tin to the other substituents. In the case of polar bonds this leads to deshielding of the tin atom in the heavy isotopomer, which compensates the shielding effect normally associated with heavy isotopic substitution. Therefore, the magnitude of Δδi values and of the SnC bond distances are not related in a simple manner. A relationship exists between J(119Sn13C) and Δδi in alkynyltin compounds. The Δδi (13C/12C) values for 29Si and 207Pb shielding in some representative organo‐silanes and ‐plumbanes are reported for comparison.
Published Version
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