A Co-Crystallised Cobalt(II) Cluster of Pyridinedicarboxylic Acid (PDC) as a Luminescent Material for Selective Sensing of Methanol

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

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 437nm (λex = 345nm) 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 × 10−4vol%). 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.

Citation

Olayemi, V. T., Tella, A. C., Adekola, F. A., Clayton, H. S., Oladipo, A. C., Mehlana, G., Ogunlaja, A. S., Oluwafemi, O. S., Ogar, J. O., Argent, S. P., & Mokaya, R. (2021). A Co-Crystallised Cobalt(II) Cluster of Pyridinedicarboxylic Acid (PDC) as a Luminescent Material for Selective Sensing of Methanol. Journal of Fluorescence, 31(4), 1177-1190. https://doi.org/10.1007/s10895-021-02746-9

• Journal Article Type: Article
• Acceptance Date: May 4, 2021
• Online Publication Date: May 25, 2021
• Publication Date: 2021-07
• Deposit Date: Jun 22, 2021
• Publicly Available Date: May 26, 2022
• Journal: Journal of Fluorescence
• Print ISSN: 1053-0509
• Electronic ISSN: 1573-4994
• Publisher: Springer Verlag
• Peer Reviewed: Peer Reviewed
• Volume: 31
• Issue: 4
• Pages: 1177-1190
• DOI: https://doi.org/10.1007/s10895-021-02746-9
• Keywords: Spectroscopy; Clinical Biochemistry; Social Sciences (miscellaneous); Biochemistry; Sociology and Political Science; Law; Clinical Psychology
• Public URL: https://nottingham-repository.worktribe.com/output/5719083
• Publisher URL: https://link.springer.com/article/10.1007%2Fs10895-021-02746-9