화학공학소재연구정보센터
Inorganic Chemistry, Vol.59, No.12, 7980-7990, 2020
Counterion-Controlled Formation of Layered Honeycomb and Polythreading Uranyl Networks and the Highly Sensitive and Selective Detection of Fe3+ in Aqueous Media
Under hydrothermal conditions, six uranium coordination polymers were obtained by employing the ligand of tris(2-carboxyethyl) isocyanurate (H(3)tci) and different combinations of d-block metal ions (Mn2+, Co2+, Zn2+, Ni2+) or N-donors (triethylamine (Et3N), 2,2'-bipyridine (2,2'-bipy)). Three uranium polymers [(UO2)(2) (tci)(2)](1/2)(-) center dot[Mn-2(mu(2)-O) (H2O)(8)](1/2)(+)center dot 2H(2)O (1), [(UO2)(2) (tci)(2)](1/2)(-) center dot [Co-2 (mu(2) -O) (H2O)(8)](1/2)(+) (2), and [(UO2)(2) (tci)(2)](1/2)(-) center dot [Zn-2(mu(2)-O) (H2O)(8)](1/)(+)(2)center dot 2H(2)O (3) containing transition metal hydrated ions, crystallized as two-dimensional coordination polymers with the common (6, 3) net topology. X-ray crystal structures of 1-3 display that they have similar honeycomb-like frameworks with all ligands bis-chelating. [UO2(tci)](-)(3) center dot[Ni-(H2O)(6)](2+)(H3O)(+)center dot 2H(2)O (4) and [UO2 (tci)](-) center dot[NH(CH2CH3)(3)](1/3)(+)center dot(2H(3)O(+))(1/3) (5) are made up of four interlocked sets and exhibit the 4-fold-interpenetrated frameworks. [UO2(tci)](-)center dot(C10H9N2)(+)center dot H2O (6) comprises the 2,2'-bipy cation as counterion and represents a 2D grid layered structure. Additional metals and the N-donors are all free in the complexes, acting as the templates and compensation of the charge equilibrium. The solid-state emission spectra indicate that all of the synthesized compounds own fluorescence emissions. Furthermore, the results of the quenching ability of Fe3+ for complexes 5 and 6 exhibit their highly sensitive and selective detection for Fe3+ ions. Moreover, the uranium complexes can be used as a potential probe for Fe3+ in aqueous solutions.