Synthesis, Structure, Luminescence And Catalysis Of Lanthanide Complexes

5-sulfasalicylic acid, with three potential coordinating groups,-COOH,-SO₃H and–OH, possesses tremendous coordinating modes and strong coordinating abilities and as aresult, plays an important role in lanthanide chemistry. On the other hand, lanthanidecoordinating polymers also act as the key role not only in academia but also in industry. Inmy master period, three main categories of lanthanide coordination polymers have beensynthesized according to the four designed manners-lanthanide chlorides and5-sulfosalicylicacid reacted with each other in different conditions. In the paper,13lanthanide coordinationpolymers with sulfur belonging to lanthanide sulfates complexes orlanthanide-5-sulfosalicylic acid complexes in four kinds of coordination frameworks havebeen described and discussed, and the effection resulting from different templated reagent,pH-adjusting agent or temperatures to the reaction of lanthanide and5-sulfosalicylic acid havebeen reasonbly explained. The structures of the complexes1-13were determined by theX-ray crystal diffractometer and are characterized by elemental analysis and IR spectrum.At the same time, the thermal stability and purity of the complexes1-8have also investigatedthrough thermal analysis method. In addition, the photoluminescent characterizations of thecomplexes3,4,5and8, and the catalytic properties of the complexes1-8were investigatedand compared. The chemical formulae of the thirteen complexes are as following.Pr₂（SO₄）₃（H₂O）₈（1） EuK（SO₄）₂（8）Nd₂（SO₄）₃（H₂O）₈（2） SmK（SO₄）₂（9）Tb₂（SO₄）₃（H₂O）₈（3） Pr（SSA）（H₂O）₂（10）Sm₂（SO₄）₃（H₂O）₈（4）[Sm（SSA）（H₂O）₂]· H₂O （11）Dy₂（SO₄）₃（H₂O）₈（5）[Eu（SSA）（H₂O）₂]（12）Gd₂（SO₄）₃（H₂O）₈（6）[Nd（SSA）（H₂O）₂]·H₂O （13）Ho₂（SO₄）₃（H₂O）₈（7）Note：H3SSA=5-sulfosalicylic acidX-ray diffraction determination results reveal that complexes1-7of Ln-SO₄-H₂O systemare isomorphous, and the2D planar structures of which are formed by correspondinglanthanide lanthanide ions and sulfate ions through covalent bond, and the （2,3,4）-connected3-nodal neutral network with a Schl fli symbol of （4².6.8².10）₂（4².6）₂（8） further form3Dframework. However, isomorphous Ln-SO₄-K system of the complexes8and9canconstruct3D framework directly by Ln-O-S-O-Ln chemical bond. They possess3D （3,4, 7）-connected3-nodel netwok with a （43）（45.6）（48.69.84） Schl fli symbol, and the kaliumcations are located in the channels. Additionally, micropore structure of complex10isdirectly constructed by praseodymium and5-sulfosalicylic acid, possessing3D5-connecteduninodel network with a Schl fli symbol of （44.62）. Isomorphous complexes11-13areconstructed by corresponding lanthanide ions and5-sulfosalicylic acid, feature2D wavelikelayers and possess2D4-connected uninodel network with a Schl fli symbol of （44.62）, andfurther form3D structure by hydrogen bondings. And the luminescence in the solid stateindicates the complex5is an excellent candidate for pure fluorescent materials.