1H NMR (400 MHz, DMSO-d6) δ 7.88 (td, J = 13.1, 6.4 Hz, 2H), 7.76 (t, J = 12.8 Hz, 1H), 7.63 -7. 54 (m, 2H), 7.45 -7.32 (m, 4H), 7.30 -7.16 (m, 2H), 6.54 (td, J = 12.6, 8.9 Hz, 2H), 6.35 (dd, J = 13.7, 2. 8 Hz, 2H), 4.06 (t, J = 7.4 Hz, 2.8 Hz, 2H), 4.06 (dd, J = 7.4 Hz, 2H) 8.9 Hz, 2H), 6.35 (dd, J = 13.7, 2. 8 Hz, 2H), 4.06 (t, J = 7.4 Hz, 2H), 3.60 (s, 3H), 2.20 (t, J = 7.2 Hz, 2H), 1.70 (d, J = 8.6 Hz, 2H), 1. 64 (d, J = 2.0 Hz, 11H), 1.55 (q J = 7.4 Hz, 2H), 1.39 (p, J = 7.5, 6.7 Hz, 2H). HRMS (ESI-TOF).

C68H76N9O2, 1051.50; found, 1050.61. 

Remarks: λex: 750 nm, λmax: 773 nm

Reference: Dyes and Pigments, 2021, 194, 109586

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