氮杂大环与钴(Ⅱ)配合物的合成及稳定性研究

在水溶液中合成了H4L1(5,12- 二苯基-7 ,14- 二甲基- 1 ,4 ,8,11 - 四氮杂环十四烷- N′,N″,N′″,N″″- 四乙酸) 与钴( Ⅱ) 的固体配合物,经元素分析和IR 表征其组成为CoH2L1·2H2 O。用pH 电位滴定技术在30 ±0 .1 ℃,0 .5 mol/LKCl 水溶液中测定了配合物的稳定常数。     

2个二核钌(Ⅱ)多吡啶配合物的合成、光物理和电化学性质

合成、表征了2个类似的含有4,5-二氮杂芴的二足配体L1和L2.配体L1和L2分别含有9-(2-羟基)苯亚氨基-4,5-二氮杂芴和9-(4-羟基)苯亚氨基-4,5-二氮杂芴.配体和Ru(bpy)_2Cl_2·2H_2O在2-甲氧基乙醇中回流反应得到相应的钌(Ⅱ)配合物[{Ru(bpy)2}_2(μ2-L1)](PF6)4和[{Ru(bpy)_2}_2(μ2-L2)](PF6)_4.对这2个配合物的紫外-可见吸收光谱、发射光谱和氧化还原性质进行研究.这2个配合物的金属-配体核移跃迁(MLCT)吸收峰在443 nm,发射峰在580 nm.这2个配合物的循环伏安图显示在1.34 V有1个RuⅢ/Ⅱ的可逆氧化峰和3个基于配体的还原峰.     

Equilibrium dialysis study on the interaction between Cu(Ⅱ) and HSA or BSA

The interaction of Cu(Ⅱ) and human serum albumin (HSA) or bovine serum albumin (BSA) at physiological pH is studied by equilibrium dialysis. The successive stability constants are obtained by non-linear least square methods fitting Bjerrum formula. For both the Cu(Ⅱ)-HSA and Cu(Ⅱ)-BSA systems, the order of magnitude of K 1 and K 2 was found to be ≈10 4 mol -1·dm 3. There are about twenty stoichiometry binding sites found in one HSA or BSA molecule. They can be divided into two or three sets. Results of equilibrium dialysis experiments suggest that there exists one strong metal binding site in both Cu(Ⅱ)-HSA and Cu(Ⅱ)-BSA. It is the imidazol group nitrogen atoms of His 3 that are primarily concerned with copper binding site. After reaching dialysis equilibrium, there is the interaction among the different binding sites, the values of K all deviate from the simple statistical effect except for K-1 and K-2 in both Cu(Ⅱ)-HSA and Cu(Ⅱ)-BSA systems, and the positive cooperative effect is found.