论文部分内容阅读
合成了吡啶3-羧酸铽(铕)配合物晶体,元素分析表明化学式为Ln(3-PYA)_3·2H_2O(Ln=Tb.Eu,3-PYA为吡啶3-羧酸)。对该配合物的红外光谱、荧光光谱、热谱及电导等性质进行了研究。吡啶3-羧酸铽的X射线衍射单晶结构分析表明,配合物为二聚体,属单斜晶系,空间点群P_(21/c),晶胞参数:a=0.9609(6)nm,b=1.1649(3)nm,c=1.7758(8)nm,β=91.75(5)°,V=1.9869nm~3,Z=2,D_(calc)=1.88g/cm~3,μ=36.5cm~(-1)。Tb~(3+)离子的配位数为8,是由吡啶3-羧酸分子中的两个氧,四个桥连吡啶3-羧酸分子中的四个氧,两个水分子的两个氧,共八个氧配位,其配位多面体为畸变12面体。两个Tb~(3+)是由四个吡啶3-羧酸的羧基氧桥连起来形成二聚体。
The crystal of terbium (europium) complex of pyridine-3-carboxylic acid was synthesized. The elemental analysis showed that the crystal was Ln (3-PYA) 3 · 2H 2 O (Ln = Tb.Eu, 3-PYA was pyridine 3-carboxylic acid). The infrared spectrum, fluorescence spectrum, thermometry and conductivity of the complex were studied. The crystal structure of pyridine-3-carboxylic acid terbium by X-ray diffraction shows that the complex is a dimer and belongs to the monoclinic space group P 21 / c. The unit cell parameters are as follows: a = 0.9609 (6) nm , b = 1.1649 (3) nm, c = 1.7758 (8) nm, β = 91.75 (5) °, V = 1.9869 nm -3, Z = 2 and D calc = 1.88 g / 36.5cm -1. The coordination number of Tb ~ (3+) ions is 8, which is composed of two oxygen atoms in pyridine 3-carboxylic acid molecule and four oxygen atoms in four bridged pyridine 3-carboxylic acid molecules. The two water molecules Oxygen, a total of eight oxygen ligands, the coordination polyhedron distortion of 12 surface body. Two Tb ~ (3+) are bridged by the carboxy oxygen of four pyridine 3-carboxylic acids to form dimers.