10.1021/ja002944u
The research focuses on the synthesis and characterization of a high-spin polyradical molecule, poly(4-phenoxyl-1,2-phenylenevinylene), which is π-conjugated, non-Kekule′, and nondisjoint, designed to create nanometer-sized functional materials. The synthesis involved a one-pot polycondensation of a star-shaped subpart and subsequent oxidation, resulting in a polymer with a molecular weight of 3.2 × 10^4 and a spin concentration of 0.4. The polyradical was characterized using various techniques including atomic force microscopy (AFM), magnetic force microscopy (MFM), and SQUID magnetometry. Reactants such as 1,3,5-triiodobenzene and 2-bromo-2′-vinyl-4,5′-bis(3,5-di-tert-butyl-4-acetoxyphenyl)stilbene were used in the Heck reaction to form the star-shaped hexamer subpart 1b, while 4-(3,5-di-tert-butylacetoxyphenyl)-1,3-divinylbenzene was prepared via the Wittig reaction. The analyses included NMR, IR, and MS to confirm the structure and purity of the synthesized compounds, and the magnetic properties were investigated using magnetization and static magnetic susceptibility measurements. The experiments demonstrated that the polyradical molecule exhibited a disklike shape of approximately 35 × 0.6 nm and showed potential as a nanosized, molecular-based magnetic dot.