Hole burning properties of aluminum phthalocyanine tetrasulfonate in various inorganic hosts with and without water addition

Determination of the dimerization constants of water soluble metallophthalocyanines by calorimetric titration using electron-donating ligands

“…However, their photochemical and catalytic activity decreases many times due to aggregation. 1,2 The dispersity of metallophthalocyanine systems can be increased by (i) the steric separation of macromolecules by intercalation and encapsulation 3,4 and (ii) the addition of detergents and electron-donating ligands to phthalocyanine-containing solutions. 1,5 The intermolecular interactions of MPc with electron-donating molecules are difficult to study because most of physico-chemical methods are insensitive to low energetic solvation interactions of MPc with molecular ligands.…”

Probing Confined Water with Nonphotochemical Hole Burning Spectroscopy: Aluminum Phthalocyanine Tetrasulfonate in Poly(2-hydroxyethyl methacrylate)

“…Hole burning of APT in wet poly-HEMA was reported in ref . In that work, however, measurements were restricted to a single temperature, 4.5 K. Nevertheless, the results established that NPHB of APT is efficient, as had been found for APT in confined water in other porous materials, , and, furthermore, that the linear electron−phonon coupling of APT's S 0 → S 1 ( Q x ) transition in wet poly-HEMA differs significantly from that in hyperquenched glassy water (HGW). To further explore the effects of confined water on the spectral dynamics and hole-burning properties of APT we present pure dephasing data for the range 4−80 K and zero-phonon hole growth kinetics data obtained at 4.5 K. Growth kinetics data are also presented for heavy water (D 2 O).…”

“…Suffice it to say that NPHB is a site excitation energy selective technique that eliminates the contribution from inhomogeneous broadening to the optical transitions of chromophores in amorphous hosts and that the mechanism of hole burning involves configurational tunneling of the chromophore/host system triggered by electronic excitation of the chromophore. Hole burning of APT in wet poly-HEMA was reported in ref 12. In that work, however, measurements were restricted to a single temperature, 4.5 K. Nevertheless, the results established that NPHB of APT is efficient, as had been found for APT in confined water in other porous materials, 13,14 and, furthermore, that the linear electronphonon coupling of APT's S 0 f S 1 (Q x ) transition in wet poly-HEMA differs significantly from that in hyperquenched glassy water (HGW). To further explore the effects of confined water on the spectral dynamics and hole-burning properties of APT we present pure dephasing data for the range 4-80 K and zerophonon hole growth kinetics data obtained at 4.5 K. Growth kinetics data are also presented for heavy water (D 2 O).…”

“…As discussed herein, the APT/poly-HEMA system does not possess hole-burning properties (ZPH width, Huang−Rhys factor, mean phonon frequency) as well suited to hole burning at higher temperatures as the APT/HGW system. Nevertheless, ZPH in the polymer system can be resolved up to 80 K. APT in other matrixes containing confined water has previously been studied both by hole burning , and by fluorescence line narrowing spectroscopy . Galaup and co-workers have studied APT in water confined in the pores of a xerogel and in a porous glass (Vycor). , In the Vycor matrix, ZPH was detectable up to 80 K .…”

“…Nevertheless, ZPH in the polymer system can be resolved up to 80 K. APT in other matrixes containing confined water has previously been studied both by hole burning , and by fluorescence line narrowing spectroscopy . Galaup and co-workers have studied APT in water confined in the pores of a xerogel and in a porous glass (Vycor). , In the Vycor matrix, ZPH was detectable up to 80 K . That system was characterized by a peak phonon frequency of 32 cm -1 and a Huang−Rhys factor of 0.13.…”