Mv. Anikin et al., OBSERVATION OF CONFORMATIONAL RELAXATION HINDRANCE IN THE SINGLET EXCITED-STATE FOR PORPHYRIN INCORPORATED IN A LIPID-MEMBRANE, Chemical physics letters, 226(3-4), 1994, pp. 337-343
The behavior of two free base porphyrins, 5,10,15,20-tetrakis(p-tolyl)
porphine (TTP) and 10,15,20-tetrakis(3,5-di-tert-butylphenyl)porphine
(TBP), incorporated into dipalmitoyl-phosphatidylcholine membranes has
been comparatively studied by steady-state fluorescence spectroscopy.
TBP in the membrane interior, in contrast to TTP, showed pronounced d
ecrease of Stokes shift and displacement of Q bands toward shorter wav
elengths due to the restriction of its conformational freedom caused b
y the interaction of tert-butyl residues with ordered lipid hydrocarbo
n chains.