Journal
MATERIALS
Volume 9, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/ma9010048
Keywords
ESIPT; tautomer; white-light-emitting molecules; Stokes shift; X-ray diffraction; DFT calculations
Categories
Funding
- Ministry of Science and Technology [MOST 104-2113-M-035-001]
- Southern Taiwan Science Park Administration [104GE08]
- Industrial Technology Research Institute
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A new white-light-emitting molecule (1) was synthesized and characterized by NMR spectroscopy, high resolution mass spectrometry, and single-crystal X-ray diffraction. Compound 1 crystallizes in the orthorhombic space group Pnma, with a = 12.6814(6), b = 7.0824(4), c = 17.4628(9) angstrom, alpha = 90 degrees, beta = 90 degrees, gamma = 90 degrees. In the crystal, molecules are linked by weak intermolecular C-H center dot center dot center dot O hydrogen bonds, forming an infinite chain along [ 100], generating a C(10) motif. Compound 1 possesses an intramolecular six-membered-ring hydrogen bond, from which excited-state intramolecular proton transfer (ESIPT) takes place from the phenolic proton to the carbonyl oxygen, resulting in a tautomer that is in equilibrium with the normal species, exhibiting a dual emission that covers almost all of the visible spectrum and consequently generates white light. It exhibits one irreversible one-electron oxidation and two irreversible one-electron reductions in dichloromethane at modest potentials. Furthermore, the geometric structures, frontier molecular orbitals (MOs), and the potential energy curves (PECs) for 1 in the ground and the first singlet excited state were fully rationalized by density functional theory (DFT) and time-dependent DFT calculations. The results demonstrate that the forward and backward ESIPT may happen on a similar timescale, enabling the excited-state equilibrium to be established.
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