Crystal engineering of zinc and cadmium coordination polymers via a mixed-ligand strategy regulated by aromatic rigid/flexible dicarboxylate ancillary ligands and metal ionic radii: Tuning structure, dimension and photoluminescence properties
| Autor: | Sarita Tripathi, Ganapathi Anantharaman, Sharad Kumar Sachan |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Ionic radius
010405 organic chemistry Stereochemistry Ligand chemistry.chemical_element Zinc 010402 general chemistry Crystal engineering 01 natural sciences 0104 chemical sciences Inorganic Chemistry Metal chemistry.chemical_compound Crystallography chemistry visual_art Pyridine Materials Chemistry visual_art.visual_art_medium Thermal stability Carboxylate Physical and Theoretical Chemistry |
| Zdroj: | Polyhedron. 119:55-70 |
| ISSN: | 0277-5387 |
| Popis: | In order to explore the effect of ancillary aromatic rigid positional isomeric ligands and flexible aromatic dicarboxylate ligands on the architecture of coordination polymers (CPs) of Zn(II) and Cd(II) ions, employing 2,6-bis(imidazol-1-yl)pyridine (pyim2) as the main ligand, six CPs were synthesized at room temperature, namely {[Zn(pyim2)(o-BDC)]·(DMF)·(MeOH)}n (1), {[Zn2(pyim2)2(m-BDC)2]·(DMF)4}n (2), {[Zn(pyim2)(p-BDC)]·(DMF)}n (3), {[Cd(pyim2)(p-BDC)(H2O)]·(H2O)2}n (4), {[Zn(pyim2)(OBA)]·(H2O)}n (5) and {[Cd(pyim2)(OBA)]·(H2O)}n (6) (H2o-BDC = phthalic acid, H2m-BDC = isophthalic acid, H2p-BDC = terephthalic acid and H2OBA = 4,4′-oxybisbenzoic acid). Structural analysis of CPs 1–6 reveals diverse architectures and dimensionalities ranging from 1D to 3D. CP 1 possesses a 2D herringbone pleated architecture with a 44·62sql 4-connected uninodal net, while CP 2 features a 1D chain. CP 3 can be represented as a 2D parallel pleated network with a 44·62sql 4-connected uninodal net. CP 4 is a linear 1D chain with non-coordinating pendant pyim2 units. CP 5 features a right-handed 1D helical chain, resulting in a 2-fold interpenetrating 4-connected 3D CP with the 65.8 sqc-5 topology. CP 6 possesses a four-membered Cd2O4 ring forming an 8-connected 3D CP exhibiting the 424·64bcu topology. The structural variations in the CPs are primarily effected by the position, orientation and bonding fashion of the coordinated carboxylate groups as well as their flexible and rigid nature, in addition to the type of transition metal ion and orientation of the pyim2 ligands. Furthermore CPs 1–6 show thermal stability and variable photoluminescent behaviors. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect