Spectroscopic probing of location and dynamics of an environment-sensitive intramolecular charge transfer probe within liposome membranes

► A prospective molecular reporter for microheterogeneous environments of lipids. ► Modulation of environment-sensitive ICT photophysics and dynamics within lipids. ► Probable location of the probe in hydrocarbon interior of the lipids. ► Slower rate of rotational-relaxation of the probe in both the lipids. ► Red-edge excitation shift study reveals slower solvent-relaxation within the lipids.