p-Doped high spin polymers

被引:67
作者
Bushby, RJ
McGill, DR
Ng, KM
Taylor, N
机构
[1] School of Chemistry, University of Leeds, Leeds
关键词
D O I
10.1039/a705076c
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
High spin polymers have been created from p-doping of networked polyaryl and polyarylamine polymers which were synthesized using the Pd-0 mediated coupling reaction of aryl di-and tri-bromides with aryl bis- and tris-boronic acids. The doping procedures produce polyradical polycations in which (in the limit of 100% doping) each spin is coextensive in its spatial distribution with three neighbouring spins. Magnetic susceptibility studies show the expected ferromagnetic spin-coupling. In this respect the best of these systems is the polymer obtained by the Pd-0 mediated coupling of 1,3-dibromo-5-tetradecylbenzene with tris(4-boronic acid-2-hexyloxyphenyl) amine which was subsequently p-doped with NO+ BF4-. A Brillouin function fit to the field dependence of the magnetization of this doped polymer at 2 K corresponds to an average spin S of 5/2. The best levels of doping achieved so far are about 15% of the theoretical maximum. These are sufficient to demonstrate the genuine high-spin nature of these polymers but are well short of the ca. 70% percolation limit needed for bulk superparamagnetic or ferromagnetic behaviour. The low doping levels are attributed to steric rather than coulombic effects.
引用
收藏
页码:2343 / 2354
页数:12
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