Room-temperature phosphorescence of cucurbit[7]uril recognized naphthalimide derivative

It is well known that most purely organic molecules give out no room-temperature phosphorescence due to consuming the energy of molecular vibration, inefficient spin-orbit coupling and easy-quenched radiation relaxation process. Room-temperature phosphorescence emission was presented by the host guest interactions between cucurbit[7]uril and a naphthalimide derivative 2-(4-aminobuty1)-6-bromo1H-benzo[dellsoquinoline-1,3(2H)-dione. This cucurbit[7]uril recognized supramolecular system can emit room-temperature phosphorescence signal in aqueous solution, as well as the 4-bromo-1,8-naphthalic anhydride polymer/cucurbit[7]uril system. The conformation of the complex was established by H-1-H-1 ROESY NMR techniques. The binding patterns and constant of this supramolecular system were well defined, and its photophysical and photochemical properties found in detail as well. (C) 2017 Elsevier Ltd. All rights reserved.