540464-03-7

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• 101-70-2 bis(4-methoxyphenyl)amine 
• 100-39-0 benzyl bromide 
• 540464-01-5 2,2'-dibromo-4,4'-dimethoxydiphenylamine 

Relevant academic research and scientific papers

Para-phenylene-bridged spirobi(triarylamine) dimer with four perpendicularly linked redox-active π systems

para-Phenylene-bridged spirobi(triarylamine) dimer 2, in which it conjugation through four redoxactive triarylamine subunits is partially segregated by the unique perpendicular conformation, was prepared and characterized by structural, electrochemical, and spectroscopic methods. Quantum chemical calculations (DFT and CASSCF) predicted that the frontier molecular orbitais of 2 are virtually fourfold degenerate, so that the oxidized states of 2 can give intriguing electronic and magnetic properties. In fact, the continuous-wave ESR spec-troscopy of radical cation 2.+ showed that the unpaired electron was trapped in the inner two redox-active dianisylamine subunits, and moreover was fully delocalized over them. Magnetic susceptibility measurements and pulsed ESR spectroscopy of the isolated salts of 2, which can be prepared by treatment with SbCl5, revealed that the generated tetracation 24+ decomposed mainly into a mixture of l) a decomposed tetra(radical cation) consisting of a tri(radical cation) moiety and a trianisylamine radical cation moiety (≈75%) and 2) a diamagnetic quinoid dication in a tetraanisyl-p-phenylendiamine moiety and two trianisylamine radical cation moieties (≈25%). Furthermore, the spin-quartet state of the tri(radical cation) moiety in the decomposed tetra(radical cation) was found to be in the ground state lying 30 cal mol-1 below the competing spindoublet state.

A spiro-fused triarylaminium radical cation with a triplet ground state

Novel spirobis(radical cation) 12+ was prepared to examine the magnetic interaction between the two radical centers. The dication 12+ was found to be a robust triplet diradical on the basis of the ESR spectrum, magnetic susceptibilit