Synthesis Of Nanosized Complex By Self-assembly In Polyacrylic Acid Pattern System

Nano-materials will have a perspective future in magnetic, electronic, optical catalytic fields, etc., owing to their unique properties. The synthesis of Nano-materials with special structure and function plays an important role in the development of nano-research, among which the in situ synthesis by self-assembly has become the "hot spot" . The study of simple , economical and effective self-assembly system will help to the synthesis and application of nano-materials.Herein, a self-assembly system with polymer pattern of lower molecular weight polyaerylie acid(PAA) have been built up, in which some nanosized complex was synthesized, including nanosphere of Pb-PAA, one-dimensional nanorod of CuS-PAA and PbS-PAA, one-dimensional helix nanochain of PbSO4-PAA, and one-dimensional reticulate nanofibres of PbCr2O7-PAA. The mechanism was discussed preliminarily, the important action of the bone angle torsion as well as the "contact bridge" served by ion in the course of self-assembly was proposed for the first time. The results show that the self-assembly system with PAA can serve as a good structure inducer for the synthesis of nanosized materials with special structure at room temperature.In addition, the nanosphere of La[Fe(CN)6]-PAA has been synthesized in the same self-assembly system, by linking the PAA and the Prussian blue like, an important branch of molecular-based magnet, and the magnetic properties of this 4f-3d complex was studied. The result shows that La[Fe (CN)6] with and without PAA, electronic transition of the complex changes clearly. More interestingly, due to the magnetic interaction between the Fe3+ and carboxyl group of PAA, the courier temperature (Tc), effective magnetic moment and other magnetic properties change, as well.