Potential of Hydroxypyrazinecarboxamides in pH and Temperature Sensing

In this study, the pH- and temperature-dependent absorption and emission properties of T-705 and T-1105 were systematically explored. The results suggest that T-705 holds significant promise as a luminescent sensor capable of detecting acidic environments and enabling measurements within a specific pH range. Meanwhile, T-1105 exhibits spectral features that appear largely insensitive to pH variations under the conditions studied. Both compounds display notable luminescence responses to temperature fluctuations, with sensitivities that compare favorably to those for reported luminescent thermosensing systems. Importantly, the observed stability of T-1105 across diverse pH conditions indicates potential for temperature sensing applications in complex environments. These findings underscore the versatile photophysical behavior of the studied compounds and open perspectives for their further development in multifunctional sensing technologies.