Chiroptical Measurement of Chiral Aggregates at Liquid-Liquid Interface in Centrifugal Liquid Membrane Cell by Mueller Matrix and Conventional Circular Dichroism Methods

Abstract

The centrifugal liquid membrane (CLM) cell has been utilized for chiroptical studies of liquid-liquid interfaces with a conventional circular dichroism (CD) spectropolarimeter. These studies required the characterization of optical properties of the rotating cylindrical CLM glass cell, which was used under the high speed rotation. In the present study, we have measured the circular and linear dichroism (CD and LD) spectra and the circular and linear birefringence (CB and LB) spectra of the CLM cell itself as well as those of porphyrine aggregates formed at the liquid-liquid interface in the CLM cell, applying Mueller matrix measurement method. From the results, it was confirmed that the CLM-CD spectra of the interfacial porphyrin aggregates observed by a conventional CD spectropolarimeter should be correct irrespective of LD and LB signals in the CLM cell.

Chirality and Chiroptical Effects in Metal Nanostructures: Fundamentals and Current Trends

“…Optical rotation (OR) refers to a rotation of the plane of polarized light due to an interaction with a chiral medium . It is a phenomenon similar to linear birefringence.…”

“…In the case of linear birefringence, a difference in the phase velocity of light can be observed along two crystallographic directions of propagation for linearly polarized light. In the case of OR, a difference in the phase velocity of light can be observed for left and right circularly polarized light, hence the effect is also referred to as circular birefringence …”

Alignment and Chirality of Porphyrin J Aggregates Formed at the Liquid–Liquid Interface of a Centrifugal Liquid Membrane Cell

“…10,11 The formation of interfacial aggregates at the dodecane−water interface was directly observed using a CLM cell installed in the 2-MGE instrument. 30 Figure 1 shows the CLM cell and defines the axes and angle of polarized light in the measurements. The x and y-axes are the horizontal and perpendicular directions, respectively, and the z axis is the direction of light propagation.…”

Measurement of physical polarization parameters by system estimation

“…Plenty of works have been done on determining one or few physical polarization parameters with straightforward analytical relations to the measurement quantities [1][2][3][5][6][7], whereas for more unknowns, direct analytical relations of polarization parameters to the measured quantities are generally complicated and lengthy [8,9]. Lu and Chipman proposed an analytical polar decomposition to extract polarization parameters from the measured Mueller matrix in [8,10], which promoted the applications of the measurement of polarization parameters dramatically [4,[12][13][14].…”

“…The measurement of physical polarization parameters, which describe various polarization properties including birefringence, diattenuation, depolarization properties of materials or optical components, has been playing a significant role in biomedical diagnosis [1,2], sensing systems [3,4], monitoring the fabrication of optical materials and components and others [5][6][7]. Plenty of works have been done on determining one or few physical polarization parameters with straightforward analytical relations to the measurement quantities [1][2][3][5][6][7], whereas for more unknowns, direct analytical relations of polarization parameters to the measured quantities are generally complicated and lengthy [8,9].…”