# Non-Conjugated Linear Polysiloxane with Cluster-Triggered Circularly Polarized Luminescence

## TL;DR

This paper introduces a new non-conjugated polymer that emits circularly polarized light when aggregated, offering potential for chiroptical material applications.

## Contribution

A non-conjugated, nonaromatic system is engineered to produce circularly polarized luminescence via cluster-triggered emission.

## Key findings

- Incorporating a chiral side group into a PMVS backbone produces pronounced CPL.
- Helical conformation is confirmed using VCD and ECD spectroscopy.
- Intramolecular hydrogen bonding stabilizes the structure, enabling tunable CPL.

## Abstract

In this study, we introduce a system that is both nonconjugated
and nonaromatic, specifically engineered to generate luminescence
via cluster-triggered emission in its aggregated state. By integrating
a chiral moiety, N-(tert-butoxycarbonyl)-cysteine
methyl ester (cys) as a side group into a linear poly­(methyl vinylsiloxane)
(PMVS) backbone, we successfully achieved pronounced circularly polarized
luminescence (CPL). The formation of the helical conformation was
evaluated by vibrational circular dichroism (VCD) and electronic circular
dichroism (ECD) spectroscopy. Furthermore, the 2D NMR analyses indicated
that intramolecular hydrogen bonding significantly contributes to
the stabilization of this structure, because of the intrinsic flexibility
of the PMVS backbone, the resultant material demonstrates mechanically
tunable CPL properties, underscoring its potential as a versatile
chiroptical platform for material applications.