Syntheses,Structures And Properties Of Coordination Polymers Based On N-containing Carboxylic Acid,Imidazole,Tripyridine Ligands

In this paper,we have chosen four ligands?L1=2,5-di?1H-imidazol-1-yl?benzoic acid,L2=2,6-dimethylpyridine-3,5-dicarboxylic acid,L3=1,4-di?1H-imidazol-1-yl?benzene and L4=4'-?4-bromophenyl?-2,2':6',2''-terpyridine?to design and synthesis nine new coordination polymers using hydrothermal methods.Through these ways:infrared spectroscopy?IR?,X-diffraction and elemental analysis?EA?that its structure were been determined and analyzed.And these complexes were solid powder diffraction?PXRD?,thermogravimetric analysis?TGA?,solid fluorescence?PL?,solid ultraviolet?UV?characterized in detail.Described as follows:First:Using N-heterocyclic carboxylic acid ligands L1,L2 and Zn²⁺,Cu²⁺,Cd²⁺synthesized three new metal organic frameworks which their structure is new.[ZnL1Cl]_n?1?,[Cu?L2?₂]·H₂O?2?,[CdL2]·H₂O?3?.Among them,compound 1 is a two-fold interpenetrating?10,3?-d utp three dimensional complex;compound 2 is a two dimensional mononuclear copper complex,which its structure can be simplifed as a rombo;compound 3 is a three-dimensional structure with one-dimensional cadmium layers.Second:Using rigid ligand 1,4-di?1H-imidazol-1-yl?benzene and different auxiliary ligands:succinic acid,trans-1,4-cyclohexanedicarboxylic acid formate two Cd²⁺andoneCo²⁺metalorganicframeworks.[CdL3?H₂SCA?]_n?4?,[CdL3?trans-H₂CHDC?]·H₂O?5?,[CoL3?trans-H₂CHDC?]·H₂O?6?which that these three complexs with a diamond topology 3D coordination polymers.Third:The complexes 7,8,9,were prepared by the combination of tripyridine with the auxiliary carboxylic acid:p-nitrobenzoic acid,fumaric acid.7,8,9 are the spatial structure of the 0 dimensional structure of the dual core,in addition to 7 crystal structure of one dimensional double layers.