|
|||||
|
|
A Co-Crystallised Cobalt(II) Cluster of Pyridinedicarboxylic Acid (PDC) as a Luminescent Material for Selective Sensing of Methanol |
|
| Authors: | Olayemi Victoria T. Tella Adedibu C. Adekola Folahan A. Clayton Hadley S. Oladipo Adetola C. Mehlana Gift Ogunlaja Adeniyi S. Oluwafemi Oluwatobi S. Ogar Joseph O. Argent Stephen P. Mokaya Robert |
| Affiliation: | 1.Department of Chemistry, University of Ilorin, P.M. B 1515, Ilorin, Kwara State, Nigeria ;2.Department of Chemistry, Faculty of Pure and Applied Sciences, Kwara State University, P.M. B 1530, Malete, Nigeria ;3.Department of Chemistry, University of South Africa, Pretoria, South Africa ;4.Department of Physical Sciences, Landmark University, Omu-Aran, Kwara State, Nigeria ;5.Department of Chemical Technology, Faculty of Science and Technology Midlands State University (MSU), Gweru, Zimbabwe ;6.Department of Chemistry, Nelson Mandela University, P.O. Box 77000, Port Elizabeth, 6031, South Africa ;7.Department of Applied Chemistry, University of Johannesburg, Johannesburg, South Africa ;8.School of Chemistry, University of Nottingham, NG7 2RD, University Park, Nottingham, UK ; |
| Abstract: | A luminescent Cobalt(II) co-crystal [Co13(PDC)16(H2O)24.7H2O] 1 (where H2PDC?=?2,6-pyridinedicarboxylic acid) have been prepared by oven-heating and slow evaporation of solvent. Single crystal X-ray diffraction (SCXRD) analysis revealed that 1 is a mixture of complexes that crystallizes in the triclinic space group P-1 and the geometry around the Co(II) ions is octahedral. The structure is extensively imbued with hydrogen bonding that helps in stabilizing the complex. Thermogravimetric analysis indicates that 1 is thermally stable up to 364 οC. The luminescence properties of 1 revealed a strong emission centered at 437 nm (λex?=?345 nm) assigned to ligand to metal charge transfer (LMCT). The luminescence sensing of 1 towards volatile organic molecules were also examined. However, 1 displayed a turn off towards methanol compared to other molecules with high quenching efficiency and low limit of detection (3.5?×?10?4 vol%). The results show excellent selectively and high sensitivity. Powder X-ray diffraction studies revealed that the structural integrity of the complex was maintained after exposure to methanol vapour. Theoretical studies also revealed small binding energy (?413.2 au) and low energy gap (1.19) for 1-CH3OH adduct. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |