Abstract
Orange-colored 7,8-dimethyl-2,3,12,13-tetramethoxy-(15H,17H)-tripyrrin-1,14-dione and its 2,3,7,8,12,13-hexaethyl analog were synthesized and converted to fluorescent derivatives by bridging a lactam nitrogen to the adjacent pyrrole nitrogen in a reaction with carbonyldiimidazole. The tripyrrindiones were also converted to the corresponding mono lactim methyl ethers by reaction with neat trimethylphosphite, and a corresponding difluoroboryl (BODIPY) derivative was made from the lactim by reaction with boron trifluoride etherate. X-ray structures of the tetramethoxytripyrrindione, the N,N′-carbonyl-bridged hexa-ethyltripyrrindione, and the lactim methyl ether of the hexa-ethyltripyrrindione were determined. The N,N′-bridged pigments exhibited very large Stokes’ shifts with fluorescence quantum yields ranging from 1.0 to 0.02.
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Acknowledgments
We thank the US National Institutes of Health (HD 17779) for generous support of this work, the National Science Foundation (CHE-0226402 and CHE-0521191) for providing funding for purchase of the X-ray diffractometer used in this work and for acquisition of a 400 MHz NMR spectrophotometer and upgrade of our 500 MHz NMR. We thank Dr. David Quilici and Ms. Rebekah Woolsey for the MALDI-TOF HRMS at the University of Nevada Proteomics Center (NIH P20 RR-016464 from the INBRE program of the National Center for Research.) We also thank Prof. T.W. Bell for use of the VPO apparatus.
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Dey, S.K., Datta, S. & Lightner, D.A. Tripyrrindiones and a red-emitting fluorescent derivative. Monatsh Chem 140, 1171–1181 (2009). https://doi.org/10.1007/s00706-009-0168-9
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DOI: https://doi.org/10.1007/s00706-009-0168-9