Trans Influence of Boryl Ligands and Comparison with C, Si, and Sn Ligands
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Abstract
In this paper, the trans influence of boryl ligands, together with that of other ligands commonly believed to have a strong trans influence, has been investigated theoretically via density functional theory (DFT) calculations on a series of square-planar platinum(II) complexes of the form trans-[PtL(Cl)(PMe3)2]. The following order of trans influence has been obtained: -BMe2>-SiMe3>-BH2>-SnMe3 approximately >-Bpin>> approximately -Bcat approximately -BCl2 approximately -BBr2 approximately -SiH3>-CH2CH3>-CH=CH2>-H approximately -Me>-C6H5>-SiCl3>-SnCl3>-CCH. Natural bond order analyses have been used to understand how the substituents at the boron center affect the trans-influence properties of the boryl ligands. The major factor is the sigma-donor strength of the boryl ligand. However, surprisingly, very strong pi acceptors also enhance the trans influence.
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