203583-95-3Relevant academic research and scientific papers
A High-Spin and Durable Polyradical: Poly(4-diphenylaminium-1,2-phenylenevinylene)
Murata, Hidenori,Takahashi, Masahiro,Namba, Kazuaki,Takahashi, Naoki,Nishide, Hiroyuki
, p. 631 - 638 (2007/10/03)
A purely organic, high-spin, and durable polyradical molecule was synthesized: It is based on the non-Kekule- and non-disjoint design of a φ-conjugated poly(1,2-phenylenevinylene) backbone pendantly 4-substituted with multiple robust arylaminium radicals. 4-N,N-Bis(4-methoxy- and -tert-butylphenyl)amino-2-bromostyrene 5 were synthesized and polymerized with a palladium-phosphine catalyst to afford the head-to-tail-linked polyradical precursors (1). Oxidation of 1 with the nitrosonium ion solubilized with a crown ether gave the aminium polyradicals (1+) which were durable (half-life > 1 month) at room temperature in air. A high-spin ground state with an average S = (4.5)/2 for 1a+ was proved even at room temperature by magnetic susceptibility, magnetization, ESR, and NMR measurements.
