Synthesis, Structures And Properties Of The Coordination Polymers Based On Nitrogenous Carboxylate Ligands

The construction of functional solids based on metal-organic frameworks(MOFs) has attracted extensive interest in the field of coordination chemistry andcrystal engineering, not only for their intriguing structural features but also for theirpotential applications as functional materials, such as magnetic materials, catalysis,and gas sorption. In this paper, five compounds were separated on the basis ofsolvothermal technique and characterized by elemental analyses, IR, XRPD, TG andsingle crystal X-ray diffractions, magnetic analyses, luminescence properties andcatlysis of partial compounds have also studied and discussed.In the first chapter, we mainly introduced the concept and and current progressof metal organic coordination polymer, describe the current research of our group.In the second chapter, three complexes,[Zn(L)(DMA)]·DMA·2H2O(1)，[Cd2(L)5(H2O)3]·14DMA(2),[Na2Cd(L)6(H2O)3]·10DMA(3) have been successfullyconstructed by3,3’-((6-hydroxy-1,3,5-triazine-2,4-diyl) bis(azanediyl))dibenzoicacid(H2L) under solvent conditions. In crystal1, the Zn(II) paddlewheel clusters asthe4-connect nodes are linked by four H2L ligands forming a “butterfly” shaped unitand then generating a two-dimensional (2D) layer along the a and b axis. This layeris further stacked together with adjacent two layers through hydrogen bondinteractions and N…N van der Waals interactions along the c axis, forming athree-dimensional (3D) structure with a pore size of10.53×10.19. Interestingly,in crystal structure of1, both N–H…O and O–H…N hydrogen-bonded synthons havegraph sets that match motifs, R22(12) and R44(12) patterns.2can be rationalized as atwo-fold interpenetrating2-connected ths-e/GeS2nets linked by carboxylate oxygenatoms of H2L ligands.3is a three-dimensional frame structure with a diamondstructure topology, containing two kinds of metal ions.In the third chapter, complexes,[Co9(TDPAT)2(2-O)6(H2O)9]·9H2O (4) has beensuccessfully constructed by5,5’,5’’-((1,3,5-triazine-2,4,6-triyl)tris(azanediyl))triisophthalic acid(H6TDPAT) undersolvent conditions,4is antiferromagnetic because the presence of theCo-(2-O)-Co chains. In the fourth chapter, complexes,[Cd(pzdc)(H2O)](5) has been successfullyconstructed by pyrazine-2,3-dicarboxylic acid (H2pzdc) under solvent conditions. Inorder to identify the complicated connectivity of the ligands and metal centers, thenetwork topology of5is further analyzed using OLEX by considering both the Cd(II)ion and the pzdc2-ligand as4-connected nodes. The resultant3D coordination netcould be described as a uninodal4-connected net of rare sra topology with Schl flisymbol of (42.63.8), which is related to the structural prototype of SrAl2(or zeoliteABW).In the conclusion, we have summarized the structures of the five Metal-organicframeworks.