Coordination Polymers Based On 1,3 - Adamantane Dicarboxylic Acid, Construction And Performance Study

Design and synthesis of the coordination polymers exhibiting novel structures and properties have provided exciting new prospects. Recently, considerable progress has been made in the design and synthesis of specific metal-organic frameworks (MOFs) which are highly active areas of investigation because of their intriguing structures and, more importantly, their potential applications in gas storage, molecular sieves, ion exchange, and catalysis. However, the self-assembly of MOFs with unique structure and function is influenced by many factors, such as the metal-to-ligand molar ratio, the nature of organic ligands, metal ions, solvent molecules, reaction temperature, counterion, and pH value of the solution. Therefore, it is a great challenge to synthesize the predicted products at this stage. In this paper, we select 1,3-adamantanedicarboxylic acid as building blocks to construct coordination polymers with selected transition metal ions and auxiliary ligands guided by assembly principle of coordination polymer crystal engineering. We have synthesized 16 coordination polymers. They are listed as follows:complexes 1 and 4 are formed by hexanuclear and tetranuclear Ag(I) clusters with weak Ag-Ag interactions; complexes 2 and 3 are dinuclear structures; 5 and 6 exhibit an infinite 1D chain structure,; whereas 7 is a discrete octanuclear Ag(â… ) unit; complex 8 forms a OD dinuclear with closed loop unit; the complex 9 is a 2D layer framework.; compounds 10 and 11 are isomorphous with a small discrepancy and present one-dimensional chain-like structures; compound 12 is a 2D interpenetrated network with (4,4) topology; compounds 13,14 and 15 crystallize in a chiral space group P212121. The high dimensional 13 and 15are essentially isostructural, and present a 3-fold interpenetrated 3D diamondoid network; whereas 14 exhibits a 2D grid layer with left-handed helical chain; compound 16 is a meso-helical one-dimensional structure showing independent metal-organic nanotube (MONT). Furthermore, the elemental analysis, IR spectra, thermal stability, X-ray powder diffraction and the luminescent properties for the compounds are also discussed.