Synthesis,Structures And Properties Of Uranyl Complexes Based On Triazine Flexible Polycarboxylic Acid Ligands

How to safely and effectively dispose of nulear waste has become a special international concern when it comes to enjoying the enermous benefits of nuclear energy for the development of society.It is very practical to use the chemical methods to reprocess and recycle nuclear waste,that is to use organic carboxylic ligands and uranyl through coordination bonds to self-assemble uranyl organic frameworks to achieve the purpose of recycling.In this present study,we chose a series of flexible polycarboxylate ligands containing a triazine ring with uranyl salts to construct uranyl complexes.As follows:1.our group have designed,synthesized and characterized three types of flexible polycarboxylic acid ligands containing-NH and-S,namely,[6-(carboxymethyl-amino)-4-oxo-4,5-dihydro-1,3,5-triazine-2-ylamino]-acetic acid(H2bodt),2,2’,2’-[1,3,5-triazine-2,4,6-triyltris(imino)] triacetic acid(H3TTG)and 2,2’,2’’-[1,3,5-triazine-2,4,6-triyltris(thio)] triacetic acid(H3TTTA).2.We synthesized six uranyl complexes by uranyl salts,other metal salts with H2 bodt,namely,[UO2(bodt)]·DMA(1),C11H15N6O17Mn2U(2),C11H15N6O17Co2U(3),C11H15N6O17Ni2U(4),C11H15N6O17Cu2U(5)and C11H15N6O17Zn2U(6).Complex 1 can efficiently recognize Ru3+ and biomolecules(DA,AA,UA and BSA).3.We synthesized four uranyl complexes by uranyl nitrate,second ligands(2,2’-bipyridine,4,4’-bipyridine,1,10-ortho phenanthroline)with H3 TTG,namely,[UO2(TTG)]·0.5DMA·2H2O(7),C21H25.5N8.5O10.5U(8),C21H25.5N8.5O10.5U(9)and C33H33.5N10.5O10.5U(10).Complex 7 can recognize pyridine and nitrobenzene.4.We synthesized a one-dimensional chain structure(NH4)[UO2(TTTA)]·2H2O(11)and two-dimensional layered structure [(UO2(TTTA))2]·[UO2(H2O)5](12)by uranyl nitrate and uranyl acetate with H3 TTTA,respectively.Complex 11 can efficiently recognize Ru3+.In complex 12,the layers are formed by anions [(UO2(TTTA))2]2-and cation clusters[UO2(H2O)5]2+ inserted the layers.There are two forms for uranyl in the same topological structures that is relatively rare.Complex 12 can recognize toluene,nitrobenzene and dimethyl sulfoxide while recognizing Ru3+.5.All these complexes have some fluorescence recognition properties,and the complexes can still maintain a high stability after recognizing other substances.