希土离子-pmap-吡啶氧化物混配配合物的制备及性质研究

STUDY ON SYNTHESIS AND CHARCTERIZATION OF TERNARY COORDINATION COMPOUND OF RARE EARTHS-PMAP-PYRIDINE OXIDE

合成了Ce(pmap)_4·2H_2O(pmap=1苯基-3 甲基-4-乙酰基-吡唑酮-5);Ln(pmap)_3·2H_2O·xC_2H_5OH(Ln=La-Nd,x=1;Ln=Sm,Eu-Lu,x=0)以及Ln(pmap)_3·L·H_2O(Ln=La-Lu;L=pyno, 3picno,4picno)等固体配合物,并对它们进行了热谱、电导、红外和可见——紫外光谱等的测试工作。观察到镧系收缩;吡啶氧化物上甲基的取代位置对混配配合物热稳定性的影响;Pr^(3+),Nd^(3+),Ho^(3+),Er^(3+)离子配合物在可见区有超灵敏跃迁现象;从XPS光谱知不同希土离子结合能的对数值与原子序数间有直线关系。

The coordination compound Ce(pmap) ·2H2O, the ternary coordination compounds of rare earths-pmap-pyridine oxide (where pmap=1-phenyl-3-methyl-4-gcetyl-pyra/olone-5),Ln(pmap)3· L · H2O and Ln(pmap) · 2H2O· xC2H5OH(Ln = La-Nd, x= 1;Ln = Sm-Lu,x = 0;L = pyno,3picno or 4picno) have been synthesized.The molar conductivities, thermogravimetric curves, IR spectra, electronic spectra and XPS spectra of the obtained coordination compounds have been examined. The phenomenon of Lanthanide contraction has been observed through the thermoeffect values for the same type of coordination compounds and the degree of difficulty of synthesis. The order of thermostability, the phenomenon of hypersensitivity of the Pr3+ ,Nd3+ ,Ho3+ and Er coordination compounds and the influence of CH3-group position in the pyridine rings on the thermostabilities also have been observed. The plotting of binding en-ergy(Ln 3d5/2 ) against atomic number shows linear relation.