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Materials 2020, 13, 2646 11 of 24 Figure 1. Normalized red and near-infrared absorption spectra of quinoline- and benzoselenazole- derived unsymmetrical squaraine cyanine dyes 9–12 acquired in acetonitrile (ACN), acetone (ACT), dichloromethane (DCM), dimethylformamide (DMF), dimethyl sulfoxide (DMSO), 1,4-dioxane (DXN), ethanol (EtOH), methanol (MeOH), tetrahydrofuran (THF) and xylene (XLN) at room temperature. Absorption is presented as arbitrary units (a.u.). Table 2. Red and near-infrared spectroscopy data of quinoline- and benzoselanazole-derived unsymmetrical squaraine cyanine dyes 9–12 in organic solvents [acetonitrile (ACN), acetone (ACT), dichloromethane (DCM), dimethylformamide (DMF), dimethyl sulfoxide (DMSO), 1,4-dioxane (DXN), ethanol (EtOH), methanol (MeOH), tetrahydrofuran (THF), xylene (XLN)] and aqueous solvents [Dulbecco’s modified Eagle medium (DMEM), water and phosphate-buffered saline (PBS)]. Dyes’ maximum absorption wavelengths are presented in nm, and the logarithms of the molar absorptivity coefficients were determined by the application of the Lambert-Beet law in M−1·cm−1. Solvent Dye 9 λmax log ε Dye 10 Dye 11 λmax log ε λmax log ε Dye 12 λmax log ε 671 5.76 676 5.81 681 5.71 686 5.70 690 5.75 689 5.69 677 5.77 695 5.76 689 5.74 718 5.72 638 5.01 617 5.27 778 5.20 ACN 686 ACT 692 DCM 694 DMF 689 DMSO 700 DXN 700 EtOH 674 MeOH 690 THF 706 XLN 733 DMEM 649 H2O 631 PBS 650 5.11 5.24 5.18 5.04 5.20 5.15 5.18 5.28 5.11 5.27 4.54 4.58 4.46 Organic Solvent 636 5.82 640 5.91 643 5.91 647 5.75 651 5.82 655 5.73 641 5.86 661 5.86 646 5.85 688 5.75 658 5.83 664 5.85 669 5.84 674 5.79 679 5.80 680 5.74 667 5.84 684 5.81 680 5.79 714 5.80 Aqueous Solvent ––625 5.10 ––608 5.32 ––628 5.09PDF Image | Photophysicochemical Light Antiproliferative vs cancer
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