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本文通过紫外-可见吸收光谱和荧光光谱,在乙醇溶液中(pH=7~8)研究了Cu(Ⅱ)离子与N,N-二(2-羧基苯基)-2,6-吡啶二甲酰胺(BCPD)的相互作用。结果表明溶液中二者以1∶1的化学计量比形成配合物,表观结合常数为(4.59±0.05)×106mol-1.L。由Cu(Ⅱ)离子与BCPD在甲醇中反应合成了1∶1型铜配合物[Cu(Ⅱ)(BCPD)]2-.2[(C2H5)3NH]+.CH3OH,用元素分析、单晶X射线衍射等手段对配合物的结构进行了表征。晶体属于单斜晶系,P21/c空间群a=1.290 90(12)nm,b=1.855 19(19)nm,c=1.752 31(16)nm,β=122.920(2)°。BCPD以吡啶氮、两个去质子化的酰胺氮原子和2个羧基与Cu(Ⅱ)配位,形成五配位畸变四方锥构型。
In this paper, the effects of Cu (Ⅱ) ion and N, N-bis (2-carboxyphenyl) -2,6-pyridinedicarboxylate on UV-vis absorption spectra and fluorescence spectra were studied in ethanol solution (pH = Amide (BCPD) interaction. The results show that the two complexes in a stoichiometric ratio of 1: 1, the apparent binding constant (4.59 ± 0.05) × 106mol-1.L. The copper complex [Cu (Ⅱ) (BCPD)] 2-.2 [(C2H5) 3NH] +. CH3OH was synthesized by the reaction of Cu (Ⅱ) with BCPD in methanol. X-ray diffraction and other means of the structure of the complexes were characterized. The crystal belongs to the monoclinic system with a = 1.29090 (12) nm, b = 1.85519 (19) nm, c = 1.752 31 (16) nm and β = 122.920 (2) ° for the P21 / c space group. The BCPD coordinates with Cu (Ⅱ) with pyridine nitrogen, two deprotonated amide nitrogen atoms and two carboxyl groups to form a five-coordinate distorted tetragon conformation.