Abstract
In this study, two different cyclophosphazene compounds bearing five pyrene units and one borondipyrromethene unit were designed and synthesized. All compounds were fully characterized by elemental analysis, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry, 1H, 13C and 31P NMR spectroscopy. The photophysical properties of the new compounds were investigated by means of absorption and fluorescence spectroscopies in dilute dichloromethane solutions. Both systems exhibit a highly efficient energy transfer process, from the excited pyrene units to the borondipyrromethene units. The photophysical studies indicated that the compounds exhibit large Stokes' shifts unlike reference simple BODIPY dyes.
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