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.