Development of Multi-Spin Conjugated Polymers with Large Magnetic Moment as a New Magneto-Responsible Organic Material

π共轭非Kekule型聚合物表现为具有大分子磁矩的多自旋有机化合物，具有磁性响应。这项研究的目的是将这些多自旋共轭聚合物表征为一种对磁性负责的纯有机材料。合成了线型、星形和超支化的聚(4-苯氧基或二苯基胺-1，2-苯乙叉)S。原子力显微镜和磁力显微镜被用来监测这些聚合物的分子像和弱磁像。磁力显微镜中的磁响应在单分子水平上精确地对应于聚合物的自旋密度、尺寸和形状。结果表明，磁力显微镜是检测这种多自旋有机聚合物非常微弱的磁信号的有效工具，聚合物分子是一种潜在的纳米级和分子基磁点的新材料。

π-Conjugated but non-Kekule-type polymers behave as a multi-spin organics with large molecular-based magnetic moment, and respond magnetically. The objective of this research is to characterize these multi-spin conjugated polymers as a magneto-responsible but purely organic material. Linear, star-shaped, and hyperbranched poly(4-phenoxyl- or - diphenylaminium-1,2-phenylenevinylene)s were synthesized. Atomic force and magnetic force microscopy were applied to monitor the molecular image and the weak magnetic image of these polymers. Magnetic response in the magnetic force microscopy exactly corresponded to spin density, size and shape of the polymer at a single-molecular level. It is concluded that magnetic force microscopy is an effective tool to detect a very weak magnetic signal of such multi-spin organic polymers and that the polymer molecule is a potentially new material of nanometer-sized and molecular-based magnetic dots.