摘要
用文献〔2〕的方法合成了十种稀土元素异硫氰酸盐与苄胺(C_8H_5CH_2NH_2)的配合物R_E(NCS)_3·4(C_6H_5CH_2NH_2)(R_E=Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,Y),并对其进行了组成分析、元素分析、红外光谱分析及X—射线衍射物相分析。利用TG、DTG热分析手段对该系列配合物R_E(NCS)_3-4(C_6H_5CH_2NH_2)的热分解进行了研究。利用Coats—Redfern法求出了配合物R_E(NCS)_3·4(C_6H_5CH_2NH_2)的第二步热分解过程的动力学参数,发现随着镧系元素原子序数的递增,反应级数和活化能都呈现“轧断”现象。
In this paper, the synthesis method of ten complexes of rare earth isothiocyanates with benzylamine has been described, and the general formula of the complexes is RE (NCS)_3· 4C_6H_5CH_2NH_2 (RE=Sm, Eu, Gd, Tb, DY, Ho, Er, Tm, Yb, Y). The prepared complexes have been characterized by the methods of component analysis, IR spectra and X-ray powder diffraction. By means of TG and DTG thermal analysis, the thermal decomposition of RE (NCS)_3· 4C_6H_5CH_2NH_2 has been studied. Kinetic parameters of the second step thermal decomposition of RE (NCS)_3·4C_6H_5CH_2NH_2 are obtained by Coats-Redfern's method. The activation energy(E) and re- action order (n) of the complexes accompanying the increase of the atomic numbers of the elements in the lanthanide series, all appear 'gadolinium-break effect'.
