Spectroscopic and Photo-Physical Properties of Near-IR Laser Dye in Novel Benign Green Solvents

Abstract

IR-792 as near IR (NIR) laser dye was dissolved with different concentrations in two types of ionic liquids (ILs) of different anion and cation, 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide (EMIM TFSI) & 1-Butyl-3-methylimidazolium tetrafluoroborate (BMIM BF 4 ), as the benign green solvent and in methanol (MeOH) as a standard solvent. The behavior of fluorescence of IR-792 dye was studied. The fluorescence of IR-792 dissolved in the ILs was heavily compared to organic solvent. Some photo-physical parameters of IR-792 were calculated. Mainly, IR-792 had a very low quantum yield of fluorescence with high intersystem crossing rate & fluorescence lifetime in picosecond range. Optical absorption and behavior of fluorescence for the rigorously the purified imidazolium ILs in the neat condition and effect of IR-792 on their fluorescence have been examined. The emission behavior of IR-792 in green solvents was independent upon the wavelength of excitation, while the emission behavior of green solvents dependent upon the wavelength of excitation whether in pure state or with NIR laser dye. At most, the intensity of fluorescence of ILs is dependent upon dye concentration.

Charge compensation in a layered van der Waals NiPS3 host through various cationic intercalations

“…For pristine NiPS 3 , 514 nm excitation was used for the Raman measurement due to the lower cut-off filter available with this setup configuration, whereas 405 nm excitation was applied for EMIM-TFSI, pristine NIPS 3 (combined with PTFE), and intercalated samples considering an expected enhanced cross-section of the EMIM unit at this wavelength. 55 The characteristic peaks of pristine NiPS 3 can be seen in the low frequency range (Fig. 9a), matching the values reported in the literature.…”

IR792-MCN@ZIF-8-PD-L1 siRNA drug delivery system enhances photothermal immunotherapy for triple-negative breast cancer under near-infrared laser irradiation

“…Likewise, IR792 shows great NIR absorption capacity and spectroscopic and photo-physical properties [11]. Additionally, the ZIF-8-released Zn 2+ ions can strengthen the efficacy of photothermal therapy by reducing the heat resistance of bacteria [9].…”

“…Indeed, MCN has been confirmed to have significant photothermal conversion efficiency due to its strong NIR absorption capacity [ 21 ]. Likewise, IR792 shows great NIR absorption capacity and spectroscopic and photo-physical properties [ 11 ]. Additionally, the ZIF-8-released Zn 2+ ions can strengthen the efficacy of photothermal therapy by reducing the heat resistance of bacteria [ 9 ].…”

“…ZIF-8 is a porous carrier with unique features including high loading and pH-sensitive degradation [ 9 ], and possesses remarkable antibacterial activity that combines photothermal heating with enhanced antibiotic delivery [ 10 ]. In addition, IR792 represents a near-infrared (NIR) laser dye showing great NIR absorption capacity [ 11 ]. Nanotherapeutics face some challenges in cancer therapy, such as poor penetration and inefficient accumulation in tumor site; however, under the irradiation of NIR laser, the nanoparticles are thermoresponsive and accumulate in tumor and effectively enter cells, thus stimulating cell apoptosis by damaging mitochondria membrane [ 12 ].…”