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6338462 
Journal Article 
Synthesis and photophysical properties of novel pyridine fused chlorophyll a derivatives 
Li, J; He, N; Liu, Y; Zhang, Z; Zhang, X; Han, X; Gai, Y; Liu, Y; Yin, J; Wang, J 
2017 
Yes 
Dyes and Pigments
ISSN: 0143-7208
EISSN: 1873-3743 
Elsevier 
146 
Elsevier 
189-198 
WOS:000410010100023 
Tandem reactions of methyl pyropheophorbide a with paraformaldehyde, reactive methylene compounds, and/or ammonium acetate provided novel pyrido[2,3-n]chlorophylls in good yields as the first examples of pyridine fused chlorophyll a derivatives, which displayed near-infrared absorptions (748–766 nm) with unusually broadened Q bands and small electrochemical HOMO-LUMO gaps (1.89–2.02 eV). 
Chlorophyll; Chlorin; Fused-ring system; Porphyrinoids; Near-infrared dye