Syntheses,Crystal Structures And Properties Of The Compounds With Multi-carboxylate

The design and synthesis of novel coordination polymers?CPs?are attracting more attetions for their novel structural topology,original properties and potentially useful applications such as magnetic properties,luminescent,adsorption,ferrielectrilic catalysis and so on.Because of the reactions of the multi-carboxylate ligands has various coordination modes,the metal-organic coordination compounds have fascinating structural topology and diverse physical properties.Polyoxometalates are a kind of good inorganic metal clusters,they have big effect in the process of synthetic organic-inorganic hybrid compounds,and which are produced with polyoxometalates have rich and novel structures.For the past few years,the design of metal-organic coordination polymers synthesis with polymer?ion method,hydrothermal method and solvent hot,etc.?synthesis method of universal application,the rationality of the design and the practical applications are gradually improve.In this paper,the construction of coordination polymers with Zn?II?ion and 2,4-dibenzoylisophthalic acid?H2L1?and 2,5-dibenzoylterephthalic acid?H2L2?under normal hydrothermal conditions with flexible N-donor ligands.And complexes of a crystal structure analysis,elemental analysis,IR characterization and TGA analysis,and studied the fluorescence,and luminescence properties were also investigated.Self-assembly of zinc?II?coordination polymers have attracted the interest of a large number of scientists due to their intriguing frameworks and fluorescence properties by studies.In this paper,we have obtained two new 3D Zn?II?coordination polymers with pcu networks.1.A novelty coordination compounds has been obtained with H₂L¹ ligand?H₂L¹ =2,4-dibenzoylisophthalic acid?,H₂L²?H₂L²=2,5-dibenzoylterephthalic acid?and the N-donor ligand?mbtz=1,3-bis?1,2,4-triazol-1-ylmethyl?benzen?with Zn?II?.[Zn₂L¹L²?mbtz?]·H₂O?1?In 1,four carboxyl groups act as bidentate linker bridging two adjacent Zn ions to form a paddle-wheel shaped [Zn2?CO2?4] clusters.The adjacent dinuclear [Zn2?CO2?4] clusters are connected by L1 ligands extending into a 1D chain.There after,the adjacent 1D chains are further linked by L2 ligands to form a 2D layer structure.Finally,the 2D layers were extended to the six-connected 3D architecture through li near N-donor spacers?mbtz?.2.A new metal-organic framework [Zn₄L1L2?btp?]·7H2O?2??btp=1,3-bis?1,2,4-t riazol-1-yl?propane?have been synthesized under hydrothermal condition.[Zn₄L₂¹L₂²?btp?₂]·7H₂O?2?Similar to complex 1,the structure of complex 2 features dinuclear [Zn2?CO2?4] c lusters as its secondary building.From a topological point of view,the dinuclear [Z n2?CO2?4] subunits can be seemed as 6-connected nodes,the L1,L2 and btp ligands can be regarded as linear connectors,and therefore the structure of 2 can also be described as a six-connected pcu topology3.A new coordination compounds has been hydrothermally synthesized based on H2L2 with Dy?III?.[Dy?L₂?1.5?H₂O?₂]·2H₂O]?3?In 3,Two Dy ions are linked two L² ligands,resulting in a 1D chain with a bi nuclear [Dy2?COO?2] cluster.Four carboxylate groups from the L2 ligands act as bi dentate bridge two adjacent chains to generate a 2D plane,which are further packe d by the carboxylate groups of L2 ligands to afford a 3D pillar-layered framework.The fluorescence and thermal stabilitie for 3 have been studied.4.A new hybrid compound was successfully prepared based on CuII ions and ph enanthroline?phen?to assemble with P2W18 under hydrothermal conditions.[Cu2?phe n?3?H2O?3?P2W18O62?][Cu?phen?2?H2O?]·5H2O?4?.The adjacent [Cu?phen?2?H2O?]2+ cations and [Cu2?phen?3?H2O?3?P2W18O62?]2-anions interconnected with each other via ?-? interactions to bridge 1D chains.Then,the 1D supramolecular chains are alternate arranged and connected by O-H···O hydrogen-bonding interactions to form a 3D supramolecular network.In addition,the photocatalytic property of compound 4 was also investigated.