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通过设计柔性配体1,5-二(2-乙基苯并咪唑基)戊烷(bep),在二羧酸辅助配体的调控下成功制备了3个配位聚合物[Cd(bep)(sba)]_n(1),[Cd(bep)(bda)]_n(2),and{[Cd_2(bep)(ada)_2]·H_2O}_n(3)(H_2sba=4,4′-磺酰基二苯甲酸,H_2bda=4,4′-联苯二甲酸,H_2ada=1,3-金刚烷二乙酸)。配合物均呈现二维层状结构。配合物1由交替的Cd(Ⅱ)/bep/sba2-螺旋链构成。配合物2由Cd/bda2-单元构成二维结构,bep作为单齿配体与Cd(Ⅱ)配位。配合物3的二维层通过Cd/ada2-/H_2O氢键螺旋链拓展成三维超分子。此外,对配合物1~3的粉末X射线衍射、热稳定性以及荧光性质进行了研究。
Three coordination polymers [Cd (bep)] have been successfully prepared by the design of the flexible ligand 1,5-bis (2-ethylbenzimidazolyl) (sba)] _n (1), [Cd (bep) (bda)] _n (2), and {[Cd_2 (bep) (ada) _2] · H_2O} _n (3) Sulfonyldibenzoic acid, H 2 bda = 4,4’-biphenyldicarboxylic acid, H 2ada = 1,3-adamantane diacetic acid). The complexes showed two-dimensional layered structure. Complex 1 consists of alternating Cd (Ⅱ) / bep / sba2-helical chains. Complex 2 consists of two-dimensional Cd / bda2- units, and bep acts as a monodentate ligand with Cd (Ⅱ) coordination. The two-dimensional layer of complex 3 expands into three-dimensional supramolecules through the Cd / ada2- / H_2O hydrogen bonding helices. In addition, the powder X-ray diffraction, thermal stability, and fluorescence properties of the complexes 1 to 3 were examined.