Pyrene for fluorescence

Benzyldimethyldodecylammonium chloride C12BAC (>99%) from Sigma Aldrich (Saint Louis, MO, USA, product number 13380), benzalkonium chloride BAC (>95%) containing 70% C12BAC and 30% benzyldimethyltetradecylammonium chloride from Sigma Aldrich (product number 12060), didodecyldimethylammonium bromide C12-C12DMA (>98%) from ABCR (Karlsruhe, Germany), cetylpyridinium chloride C16Py (>98%) from Sigma Aldrich, dodecylpyridinium chloride C12Py (>99%) from ABCR, octylpyridinium bromide C8Py (>99%) from Chemos GMbH (Altdorf, Germany), dodecyltrimethylammonium chloride C12DMA (>97%) from ABCR, pyrene for fluorescence (>99%) from Sigma Aldrich were used as received. All solutions were prepared by weighing with dissolving the surfactant in physiological solution (0.9 wt% NaCl) as a solvent. Distilled deionized water for the preparation of the solutions was obtained using an ultrapure water purification system Milli Q (Millipore, Burlington, MA, USA).

1-Phenylazo-2-naphthol (Sudan I, Acros Organics, New Jersey, USA), pyrene for fluorescence (Sigma, Switzerland, 99%), cetyltrimethylammonium bromide (CTAB) (Acros Organics, New Jersey, USA, 99%), sodium dodecyl sulfate (SDS) (Acros Organics, New Jersey, USA, 99%), Tween 80 (Acros Organics, New Jersey, USA, BioXtra) were used. Unless otherwise mentioned, other chemicals and solvents were of analytical grade from commercial sources. Dimethylformamide (DMF) and tetrahydrofuran (THF) were purified according to conventional procedures [79 ]. Compounds 1a–h, 2a–h were obtained as reported earlier [50 (link)].