TY - JOUR
T1 - Tetraarylporphyrins in Mixed Langmuir-Blodgett Films
T2 - Steady-State and Time-Resolved Fluorescence Studies
AU - Gust, Devens
AU - Moore, Thomas
AU - Moore, Ana
AU - Luttrull, David K.
AU - DeGraziano, Janice M.
AU - Boldt, Nancy J.
AU - Van der Auweraer, Mark
AU - De Schryver, Frans C.
PY - 1991/7/1
Y1 - 1991/7/1
N2 - The absorption, fluorescence emission, and fluorescence excitation spectra of mixed Langmuir-Blodgett (LB) films of 5-(4-acetamidophenyl)-10,15,20-tri-p-tolylporphyrin and each of 10 different lipid diluents have been determined in order to investigate those factors that affect porphyrin association. LB films on glass of this porphyrin mixed with dioleoyl-, dielaidoyl-, or oleoylstearoylphosphatidylcholine yield absorption and fluorescence spectra similar to those of dilute solutions of the porphyrin in organic solvents, whereas other lipids give varying amounts of porphyrin aggregation. On fused silica plates, LB films of this porphyrin and the same three phosphatidylcholine diluents in molar ratios of 1:20 or 1:50 yield fluorescence decays at 655 nm, which may be analyzed as single exponentials to yield lifetimes of ca. 9.8 ns, which are similar to the lifetimes of monomeric porphyrins in organic solvents. Three other tetraarylporphyrins bearing acidic, basic, or hydrophobic substituents in place of the acetamido group showed evidence of aggregation when deposited as mixed films with dioleoylphosphatidylcholine.
AB - The absorption, fluorescence emission, and fluorescence excitation spectra of mixed Langmuir-Blodgett (LB) films of 5-(4-acetamidophenyl)-10,15,20-tri-p-tolylporphyrin and each of 10 different lipid diluents have been determined in order to investigate those factors that affect porphyrin association. LB films on glass of this porphyrin mixed with dioleoyl-, dielaidoyl-, or oleoylstearoylphosphatidylcholine yield absorption and fluorescence spectra similar to those of dilute solutions of the porphyrin in organic solvents, whereas other lipids give varying amounts of porphyrin aggregation. On fused silica plates, LB films of this porphyrin and the same three phosphatidylcholine diluents in molar ratios of 1:20 or 1:50 yield fluorescence decays at 655 nm, which may be analyzed as single exponentials to yield lifetimes of ca. 9.8 ns, which are similar to the lifetimes of monomeric porphyrins in organic solvents. Three other tetraarylporphyrins bearing acidic, basic, or hydrophobic substituents in place of the acetamido group showed evidence of aggregation when deposited as mixed films with dioleoylphosphatidylcholine.
UR - http://www.scopus.com/inward/record.url?scp=0026191227&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0026191227&partnerID=8YFLogxK
U2 - 10.1021/la00055a033
DO - 10.1021/la00055a033
M3 - Article
AN - SCOPUS:0026191227
SN - 0743-7463
VL - 7
SP - 1483
EP - 1490
JO - Langmuir
JF - Langmuir
IS - 7
ER -