基于半刚性不对称配体的Cu^((Ⅱ))配合物的合成及选择性染料吸附性能

Synthesis and selective dye absorption of a novel Cu^((Ⅱ)) coordination framework with a semi-rigid asymmetric ligand

在高温水热的反应环境下,以不对称的5-(4-((1-氢-1,2,4-三唑-1-基)甲基)苯基)-1-氢-四唑(简称HL)为半刚性配体,合成了一个新型的金属有机配位聚合物[Cu(μ_2-L)_2(H_2O)_2]·2HL·6H_2O·(H_4SiW_(12)O_(40))]_n(1).利用X-线单晶衍射、傅里叶变换红外、元素分析、X-线粉末衍射对配合物1的结构进行表征.配合物1是一个新颖的Cu(Ⅱ)-L--杂多酸配位框架,在水溶液中可以选择性地吸附刚果红染料分子,其吸附容量达到65.1 mg/g.对配合物1吸附刚果红染料的可逆性进行研究发现,被吸附的刚果红不会被释放,说明二者间形成了较强的配位键.

A semi-rigid asymmetric ligand 5-（4-（（1H-1,2,4-triazol-1-yl）methyl） phenyl）-lH-tetrazole （HL） was employed to synthesize a novel coordination polymer, namely [Cu（μ2-L）2（H2O）2]·2HL·6H2O·（H4SiW12O40）],（1）, under hydro-thermal conditions. Single crystal X-ray analysis, FT-IR, elemental analysis and powder X-ray diffraction were adopted to determine the structure of the complex 1. Complex 1 presented a novel POM loaded Cu （Ⅱ）-L- coordination framework, and can selectively absorb Congo red dye molecules in aqueous solutions, the absorption amount of which was 65.1 mg/g. The experiment on the absorption reversibility of the complex 1 on Congo red showed that Congo red absorbed by complex 1 will not be released, which demonstrated that some stronger coordinate bonds maybe formed between Congo red molecule and complex 1.