Absorption and fluorescence properties of cyanine dyes

Determination of the photoluminescence quantum yield of dilute dye solutions (IUPAC Technical Report)

“…This requires correction (i.e., consideration of the wavelength dependence of the exciting photon flux, see also Sections III.2.1.iv and III.4.5), which can result in higher uncertainties for non-expert laboratories [36]. The Φ f of the standard must be reliably known, preferably including its uncertainty [36,38,39,41,44], and the standard must be well characterized with respect to all the parameters that can affect its quantum yield such as dye purity, solvent (type and purity), temperature, oxygen concentration (as well as to the presence of other quenchers), excitation wavelength, and chromophore concentration [1- 4,16,39,44,63,68], see also [62]. In addition, the measurement conditions (instrument used including calibration, instrument settings, measurement geometry, type of cell used, etc., see Section III.4) should be well documented, see [62] and Section III.9 [9,16,44].…”

Fluorescence standards: Classification, terminology, and recommendations on their selection, use, and production (IUPAC Technical Report)

“…The luminescence quantum yield of these standards should be reliably known, preferably including its uncertainty. Because fluorescence quantum yields can be sensitive to factors such as oxygen concentration (as well as to the presence of other quenchers), temperature, excitation wavelength, and chromophore concentration, these parameters should be given [1,3,4,6,7,65,[122][123][124][125][126]. Preferably, the magnitude of the quantum yields of standard and sample should be similar, to circumvent problems related to nonlinearities of the detection system, or dilution errors.…”

Kinetics and mechanism of sodium (Z)-3-(5-chloro-2-((5-chloro-3-(3-sulfonatopropyl) benzothiazol-2(3H)-ylidene)methyl)benzo-thiazol-3-ium-3-yl)propane-1-sulfonate adsorption on gold nanoparticle colloids of different properties and size

“…Hibridne nanočestice koje se sastoje od jezgra plementog metala funkcionalizovanog omotačem koga čini organska boja su poznate zbog svojih neobičnih optičkih svojstava, uključujući ultrabrze indukovane transparencije, nelinearno ponašanje, Fano rezonancije sa asimetričnim oblikom linije rasejanja i pojačano fotoindukovano razdvajanje naelektrisanja [1,[10][11][12][13][14][15]. Pošto su cijanske boje jako fluorescentne [16], merenje fluorescentnih svojstava agregata čestica-boja može dati važan uvid za razumevanje molekulskih interakcija i reaktivnosti u ovakvim sistemima. Za ovakve hibridne strukture su karakteristični fenomeni kao što su gašenje fluorescencije boje [17], a fluorescentno obeležavanje je u širokoj upotrebi u medicinskoj dijagnostici [7] gde se koristi da bi se lokalizovale nanočestice ili simuliralo otpuštanje lekova.…”

“…Pritom se, da bi se sprečila agregacija čestica, u rastvor često dodaje stabilizujući agens [130] koji se adsorbuje na površini nanočestice. Pored toga, poznato je da se 16 nanočestice zlata mogu dobiti i biosintezom iz gljiva [131]. Nanočestice zlata mogu biti funkcionalizovane različitim organskim ligandima pri čemu se formiraju organskoneorganski hibridi sa poboljšanom funkcionalnošću [132].…”

“…Cijanske boje su organska jedinjenja koja imaju intenzivnu apsorpciju u vidljivoj oblasti, a u obliku monomera i agregata su jako fluorescentna, i u rastvoru i u uređenoj sredini [16,25,26,149]. Ova jedinjena, čija je opšta struktura prikazana na Shemi 1, su od velikog interesa, i sa stanovišta nauke i u praktičnom smislu.…”