Absorption spectrum 1 Bismuth complexes 1 Bismuth compounds 1 Coronavirus 1 Coronavirus infection 1 Coronaviruses 1 Electromagnetic wave absorption 1 Emission bands 1 IR luminescence 1 Intense emission 1 Luminescence 1 Nuclear magnetic resonance spectroscopy 1 Optical properties 1 Porphyrins 1 Spatial configuration 1 Spectra's 1 Spectral characteristics 1 Synthesis (chemical) 1 absorption spectra 1 bismuth complexes coronavirus infection 1 porphyrins 1 spectral characteristics 1