Effect of variation of the halides on the proton isotropic shifts of triphenylphosphine in trihalogeno-(triphenylphosphine)cobaltate(II) anion

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Abstract
The effect of X (Cl–, Br– and I–) on the proton isotropic shifts of the triphenylphosphine protons in the complex anion [CoX3(PPh3)]– has been studied. The magnitude of the proton isotropic shifts of the meta-1H and para-1H increases from Cl– to I– in all the solvents studied, but the reverse is true for the ortho-1H. Ion-induced magnetic anisotropy accounts for the reversed trend.