Abstract
Spectroscopic, thermal and fluorescence properties of various thallium and tin complexes, X-Tl(III)t(4-Y)PP and X-Sn(IV)t(4-Y)PP where X = 5-SO3H-2-OHOC6H4,(5-SSA); 5-Cl-2-OHOC6H4,(5-CSA); and 5-NH2-2-OHOC6H4,(5-NSA) and Y = –Cl, –OCH3, are investigated in detail. Analysis of the spectral data [IR, UV–Vis and NMR (1H and 119Sn)] of complexes suggests that the two trans-axial ligands are strongly bound in a symmetric manner at the tin center in these complexes. Whereas the absorption and emission studies of thallium complexes characterized the sitting-Atop (SAT) feature of the complexes, the fluorescence lifetime of the tin complexes is found to be higher than thallium complexes. The structure and morphology of complexes were studied by X-ray powdered diffraction analysis. From the X-ray diffractograms, it could be revealed that the complexes are crystallized in mixed crystalline forms. Thermal studies of these porphyrins were carried out in an argon atmosphere from room temperature to 800 °C using thermal analyzer. Evaluation of the thermal analysis of the two metal complexes reveals that the tin(IV) porphyrin complexes are more stable than thallium(III) complexes. Some of the synthesized complexes of thallium and tin have been screened for biological activity against B. subtilis, M. luteus, S. aureus, P. florescens and E. coli by agar well diffusion methods that were found to be inactive against bacterial strains.
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Acknowledgements
We would like to acknowledge Indian Institute of Technology, Mandi, Himachal Pradesh, for photoluminescence studies and IIIM, Jammu, for their UV–Vis. studies. We thank University Grant Commission, New Delhi, for their support. We also thank IISC, Bangalore, for the NMR studies.
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Katoch, S., Bajju, G.D., Devi, G. et al. Synthesis, thermoanalytical and spectroscopic characterization of newly synthesized macrocyclic complexes of thallium(III) and tin(IV). J Therm Anal Calorim 130, 2157–2165 (2017). https://doi.org/10.1007/s10973-017-6531-x
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DOI: https://doi.org/10.1007/s10973-017-6531-x