摘要
合成了稀土离子Nd、Gd、Er与 β 丙氨酸的配合物并进行了元素分析、红外光谱等表征 ,测定了 3个配合物的晶体结构。配合物组成为 { [Ln2 ( β ala) 6(H2 O) 4 ](ClO4) 6·H2 O} n(Ln =Nd( 1)、Gd( 2 )、Er( 3) ) ,配合物均属于三斜晶系 ,P 1空间群 ,主要晶体学数据为 :( 1) :a =1 2 913( 3)nm ,b =2 176 5 ( 4 )nm ,c =0 936 82( 19)nm ,α =99 0 7( 3)° ,β =96 91( 3)° ,γ =76 75 ( 3)° ,Z =2 ,Dc=1 988Mg/m 3 ,F( 0 0 0 ) =15 0 2 ,R1=0 0 5 4 7,wR2 =0 14 0 8;( 2 ) :a =1 2 911( 3)nm ,b =2 16 79( 4 )nm ,c =0 92 717( 19)nm ,α =98 94 ( 3)° ,β=97 0 0 ( 3)° ,γ =76 85 ( 3)° ,Z =2 ,Dc=2 0 5 0Mg/m3 ,F( 0 0 0 ) =15 18,R1=0 0 5 2 2 ,wR2 =0 14 30 ;( 3) :a=1 2 880 ( 3)nm ,b =2 16 2 9( 4 )nm ,c =0 92 10 3( 18)nm ,α =98 77( 3)° ,β =97 2 9( 3)° ,γ =76 92 ( 3)° ,Z =2 ,Dc=2 10 0Mg/m 3 ,F( 0 0 0 ) =15 34,R1=0 0 6 15 ,wR2 =0 175 2。 3个配合物的晶体结构类似 ,均为无限链状分子 ,配合物中稀土离子均为九配位的单帽四方反棱柱配位多面体。配位羧基氧原子与中心金属离子的平均键长从Nd到Er配合物随着稀土原子序数的增大而缩短。抑菌实验表明 ,配合?
Three β -alanine complexes with rare earths, {\[Ln 2( β -ala) 6(H 2O) 4\] (ClO 4) 6·H 2O} n (Ln= Nd(1), Gd(2), Er(3)), were synthesized and characterized by elemental analysis and IR. The crystal structures of three complexes were determined by X-ray diffraction method. All complexes crystallize in triclinic P 1 space group with (1) a =1 291 3(3) nm, b =2 176 5(4) nm, c =0 936 82(19) nm, α =99 07(3)°, β = 96 91(3)°, γ =76 75(3)°, Z =2, D c=1 988 Mg/m 3, F (000)=1 502, R 1=0 054 7, wR 2=0 140 8 for Nd complex; (2) a =1 291 1(3) nm, b =2 167 9(4) nm, c =0 927 17(19) nm, α =98 94(3)°, β = 97 00(3)°, γ =76 85(3)°, Z =2, D c=2 050 Mg/m 3, F (000)=1 518, R 1=0 052 2, wR 2=0 143 0 for Gd complex; (3) a =1 288 0(3) nm, b =2 162 9(4) nm, c =0 921 03(18) nm, α =98 77(3)°, β =97 29(3)°, γ =76 92(3)°, Z =2, D c=2 100 Mg/m 3, F (000)=1 534, R 1=0 061 5, wR 2=0 175 2 for Er complex. All three complexes have similar structures with one-dimensional infinite chain. The rare earth ion in the complexes is nine-coordinated in a distorted monocapped square antiprism geometry with seven oxygen atoms from six β -alanine molecules and two oxygen atoms from two water molecules. The average bond length of Ln-O(carboxyl) from Nd to Er complexes shortens with the increase of the atomic number of rare earth. The antibacterial activity of the complexes and β -alanine was tested. The complexes were more bacteriostatically active than the ligand.
出处
《应用化学》
CAS
CSCD
北大核心
2004年第1期58-63,共6页
Chinese Journal of Applied Chemistry
基金
广西自然科学基金资助项目 (桂自 9912 0 44 )
关键词
稀土配合物
Β-丙氨酸
抑菌活性
rare earth complex,β-alanine,antibacterial activity
