N-对甲苯磺酰β-丙氨酸稀土(Pr、Yb)一维链配合物的合成、晶体结构及抑菌活性

Syntheses, Crystal Structure and Antibacterial Activity of Rare Earth(Pr,Yb) 1-D chain Complexes with N-p-Tolylsulfonyl-β-Alanine

合成了N 对甲苯磺酰β 丙氨酸与稀土Pr3+离子和Yb3+离子的配合物,并进行了元素分析及红外光谱表征。测定了 2个配合物的晶体结构。配合物组成为 [Ln2 (H2O)4 (Ts -β -Ala- )6 ]n·4nH2O(Ln为Pr(1)、Yb(2),Ts -β- Ala-为N 对甲苯磺酰β- 丙氨酸阴离子 ),配合物属单斜晶系,P21 /n空间群;晶胞参数:配合物(1):a=0. 953 2(3)nm,b=1 .909 5(6)nm,c=2. 298 0(8)nm,β=99. 73(2)°;配合物(2):a=0 .956 9(1)nm,b=1 888 0(3)nm,c=2. 286 8(3)nm,β=100 .41(1)°。配合物 (1)和 (2)均为无限一维链结构,但链中羧基桥连方式不同;Pr3+为 9配位而Yb3+为 8配位。抑菌实验表明,配合物的抑菌效果明显好于配体。

Two rare earth complexes with formula \[Ln_2(H_2O)_4(Ts-β- Ala-)_6\]_n·4nH_2O(where Ln=Pr(1),Yb(2 ), Ts-β-Ala-=N-p-tolysulfonyl-β-Alanine anion) were prepared and their crystal structures were determined by X-ray diffract ometry. Both the complexes are monoclinic, with space group P2_1/n. The cry stal data are:(1):a=0.953 2(3) nm, b=1.909 5(6) nm, c=2 .298 0(8) nm, β=99.73(2)°, Z=4, D_c =1.514×10-3 g/cm3; (2):a=0.956 9(1) nm, b=1.888 0(3) nm, c=2 .286 8(3) nm, β=100.41(1)°, Z=4, D_c=1.589×10-3 g/c m3. The two complexes in crystal have one-dimensional chain structures and are different in bridging type of carboxyl groups. The coordination numbe r of the PrⅢ ion is nine and that of the YbⅢ ion is eight. The com plexes have stronger antibacterial activity than the ligand does.