Investigating the Potential of Flexible and Pre-Organized Tetraamide Ligands to Encapsulate Anions in One-Dimensional Coordination Polymers: Synthesis, Spectroscopic Studies and Crystal Structures
| Autor: | Mohd Sukeri Mohd Yusof, Nafisah Mansor, Maisara Abdul Kadir, Nur Shuhaila Haryani Abd Haris, Christopher J. Sumby |
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| Rok vydání: | 2021 |
| Předmět: |
synthesis
Coordination polymer General Chemical Engineering pre-organized amide Crystal structure 010402 general chemistry 01 natural sciences crystal Inorganic Chemistry Metal chemistry.chemical_compound tetraamide framework Propane Amide lcsh:QD901-999 Moiety Molecule General Materials Science 010405 organic chemistry Ligand Condensed Matter Physics 0104 chemical sciences coordination polymer Crystallography chemistry visual_art visual_art.visual_art_medium lcsh:Crystallography |
| Zdroj: | Crystals Volume 11 Issue 1 Crystals, Vol 11, Iss 77, p 77 (2021) |
| ISSN: | 2073-4352 |
| DOI: | 10.3390/cryst11010077 |
| Popis: | The synthesis of amide-based molecules, possessing pre-organized structures, has received significant attention due to their potential applications as molecular receptors and as components of nanomaterials. In this study, four extended tetraamide ligands incorporating ethylene and propylene spacers, namely 1,2-bis[N,N&prime 6-(3-pyridylmethylamido)pyridyl-2-carboxyamido]ethane (L1), 1,2-bis[N,N&prime 6-(4-pyridylmethylamido)pyridyl-2-carboxyamido]ethane (L2), 1,2-bis[N,N&prime 6-(3-pyridylmethylamido)pyridyl-2-carboxyamido]propane (L3) and 1,2-bis[N,N&prime 6-(4-pyridylmethylamido)pyridyl-2-carboxyamido]propane (L4), were successfully synthesized. Further, reaction of L2 and L4, incorporating pendant 4-pyridyl donors as the metal coordinating sites, with cadmium salts, produced two close-packed one-dimensional coordination polymers, {[Cd3(L2)4(H2O)10](NO3)6· 12H2O· CH3OH}n and {[Cd(SO4)(L4)(H2O)2]· 4H2O· CH3OH}n. X-ray crystallography reveals that the flexible tetraamide ligands fold upon themselves in the coordination polymer structure. As a consequence, the anion pocket in {[Cd(SO4)(L4)(H2O)2]· CH3OH}n incorporating the ligand with the propylene spacer was blocked from encapsulating charge-balancing anions, which were involved in bridging the di-cadmium units. Interestingly, a strong interaction between the 2,6-pyridine dicarboxamide moiety with the nitrate anions was found in {[Cd3(L2)4(H2O)10](NO3)6· CH3OH}n, showing potential for materials made from these ligands to serve as anion receptors. |
| Databáze: | OpenAIRE |
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