To further explore the high-performance magnetic materials

poly[bis(ethoxycarboxy)methyl acrylate] and its three complexes PEOCMA-Ni2+

PEOCMA-Nd3+

PEOCMA-Gd3+ were synthesized using diethyl bromomalonate as the basic raw material.The synthesis of poly[bis(ethoxycarboxy)methyl acrylate] and its three complexes PEOCMA-Ni2+

PEOCMA-Nd3+

PEOCMA-Gd3+ were described.These polymer-metal complexes were first prepared by the reaction of PEOCMA with Ni2+

Nd3+ and Gd3+.Their structures were determined by FTIR

1H-NMR and GPC

while their metal contents were measured by IPC.The temperature dependence of magnetization at an applied field 3.98106 A/m and the applied field dependence of magnetization at 5 K for the PEOCMA-Mn+ complexes were measured by PPMS(physical property measurement system).The saturation values of magnetization of PEOCMA-Ni2+

PEOCMA-Nd3+ and PEOCMA-Gd3+were 13.2 Am2/kg

9.5 Am2/kg and 38.2 Am2/kg

and the coercive force values of the complexes were 9634 A/m and 1544 A/m

respectively.These results showed the presence of the three kinds of polymer-metal complex magnetic interactions at a low temperature.The magnetic properties of polymer-metal complexes had a great relationship with the type of metal.It was found that although the content of Nd3+ in the complex was higher than that of Gd3+

its saturation magnetization was lower with its inferior magnetic property.