Electron spin resonance study of adducts of gallium trichloride and digallium hexachloride with the free-radical base, 2,2,6,6-tetramethylpiperidine nitroxide

Abstract

Reaction of gallium trichloride with 2,2,6,6-tetramethylpiperidine nitroxide (TEMPO) yields two adducts, (I)(Ga₂Cl₆â†�TEMPO) with A_iso(¹⁴N)= 19·13 G, A_iso(⁷¹Ga)=–55·3 G and (II)(GaCl₃â†�TEMPO) with g_∥= 2·003, g_⊥= 2·007, A_iso(¹⁴N)= 19·75 G, A_∥(¹⁴N)= 39 G, A_∥(⁷¹Ga)=–50 G, A_⊥(⁷¹Ga)=–44 G, A_iso(⁷¹Ga)=–48·0 G. The principal values of the g-tensor are close to those for TEMPO alone, and the Ga hyperfine tensors show that the isotropic component stems from spin polarisation of the O–Ga σ electrons and the anisotropic component probably stems from polarisation of the O–Ga π-electrons.