Abstract
The radical complexes (μ-L)[Ru(bpy)2]2.bul.3+, (μ-bmtz)[Ru(cym)Cl]2.bul.+ and (μ-L)[Re(CO)3Cl]2.bul.-, where L are 3,6-disubstituted 1,2,4,5-tetrazines such as 3,6-bis(2-pyrimidyl)-1,2,4,5-tetrazine (bmtz) and p-cymene (cym), were studied by X-band EPR in fluid soln. and by 285 GHz EPR in glassy frozen soln. A comparison with other transition metal complexes (Cu, Rh, Os, Ir, Pt) involving tetrazine radical ligands reveals that the g anisotropy reflects (i) the p acceptor effect of the tetrazine substituents, (ii) the competition from ancillary p acceptor ligands for back donation from the metal, and (iii) the spin-orbit coupling contributions from the transition metal. [on SciFinder(R)]
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