摘要
以1,3-二(4-吡啶基)-丙烷(bpp)和邻苯二甲酸(1,2-H2bdc)为配体,通过水热法合成了过渡金属配合物M2(1,2-bdc)2(bpp)2·2H2O[M=Co(1),Ni(2)]和Cd(1,2-bdc)(bpp)·H2O(3).配合物1和2属单斜晶系P21空间群,具有相似的三维骨架结构.配合物中存在2种配位环境相似的金属中心,每个金属中心采取六配位的畸变八面体构型,与来自2个1,2-bdc配体的3个氧原子和2个bpp配体的2个氮原子以及1个水分子配位.1,2-bdc配体采取单齿/双齿螯合的配位模式将金属离子连接成M1-(1,2-bdc)-M2右手螺旋链.bpp配体采取Trans-Gauche(TG)构型,连接相邻的金属离子形成M1-(bpp)-M1链和M2-(bpp)-M2链.这3种链交织在一起构筑成具有{65.8}拓扑的三维结构.配合物3属单斜晶系P21/c空间群,具有单节点的双层二维结构.Cd(Ⅱ)离子采取七配位的畸变五角双锥体构型,与来自2个1,2-bdc配体的4个氧原子,2个bpp配体的2个氮原子和1个水分子配位.1,2-bdc配体采取双齿螯合/双齿螯合的配位模式将Cd(Ⅱ)离子连接成Cd-(1,2-bdc)-Cd链.bpp配体采取TG构型,连接相邻的Cd(Ⅱ)离子,形成Cd-(bpp)-Cd链.这2种链通过共享Cd(Ⅱ)离子交错排列构筑成二维结构.配合物3显示出强的荧光,最大发射位于408 nm处,对应于配体的π*-π跃迁.不同有机小分子对配合物3的荧光强度有不同程度的影响,苯胺对其有显著的猝灭作用,基于荧光猝灭机理,配合物3可用于选择性检测苯胺分子.
Taking 1,3-di ( 4-pyridyl)-propane (bpp) and 1,2-benzenedicarboxylic acid ( 1,2-H2bdc ) as ligands, three new transition metal complexes, M2( 1,2-bdc) 2(bpp)2·2H2O[M( Ⅱ )= Co(1), Ni(2) ] and Cd( 1,2-bdc) (bpp) · H2O (3), were obtained. Complexes 1 and 2 crystallize in monoclinic crystal system with space group P21 and show 3D structures with {65 · 8} topology. There are two M ( Ⅱ ) centers with the similar coordination environments in complexes 1 and 2. Each M( Ⅱ ) center is six-coordinated to three oxygen atoms from two 1,2-bdc ligands, two nitrogen atoms from bpp ligands and one water molecule in a distorted octahedral arrangement. The 1,2-bdc ligand adopts monodentate bridgingc/bidentate chelating mode to link two metal centers to form MI-( bpp)-M1 right-handed-helical chain. The bpp ligand adopts Trans-Gauche(TG) conformation and connects adjacent M( H ) centers to form MI-( bpp)-M1 and M2-( bpp)-M2 chains. These three kinds of chains are woven together to form a 3D framework. Complex 3 crystallizes in monoclinic crystal system with space group P21/c and shows a 2D structure. The Cd( lI ) is in distorted pentagonal bipyrarnidal polyhedron with four oxygen atoms of two 1,2-bde ligands, two nitrogen atoms of bpp ligand and one water molecule; The 1,2-bdc ligand adopts bi ( bidentate chelating ) mode to link Cd ( Ⅱ ) centers to form Cd-(1,2-bdc)-Cd chain. The bpp ligand adopts TG conformation and connects Cd ( Ⅱ ) centers to form Cd-(bpp)-Cd chain. The two kinds of chains with shared Cd( Ⅱ) are alternately arranged to form a 2D struc- ture. Complex 3 shows strong ligand-based fluorescence with maximum emission at 408 nm, which is attributed to π*-π transition of the ligands. Different organic small molecules have different effects on the fluorescence intensity of complex 3, and aniline has a significant quenching effect, thus complex 3 can be used for the se- lective detection of aniline through
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2017年第7期1125-1133,共9页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:21471104)
首都师范大学科技创新服务能力建设-科研水平提高定额-交叉科研项目资助~~