Nonconventional Fluorescent Polynorbornenes Bearing Aminosuccinimide Side Groups

Abstract

In this contribution, a new class of fluorescent polynorbornenes containing side chains that homogeneously decorated with aminosuccinimide side groups as nonconventional chromophores is introduced. First of all, monomers M1–M3 are synthesized in an efficient and straightforward fashion by means of Michael addition between three kinds of alkyl amines and monomer precursor 1, a compound containing norbornene (polymerizable group) and maleimide (Michael acceptor) groups. Subsequently, ring‐opening metathesis polymerization of M1–M3 is conducted to generate polymers P1–P3 with high molecular weights (Mn values exceeding 9800) and narrow molecular weight distributions (Ð values no more than 1.20), respectively. Quantitative conversion of monomers and microstructural integrity of polymers are verified in all cases. Finally, thermal stability, glass transition behavior, wettability, and optical properties of polymers P1–P3 are investigated. In particular, this new class of fluorescent polymeric materials exhibits blue emission (470–478 nm) under UV irradiation with large Stokes shifts (over 110 nm).

Clustering-Triggered Emission and Persistent Room Temperature Phosphorescence of Sodium Alginate

“…Further examination of its major component, namely starch, and other natural products like cellulose, glucose, and dextran illustrated their similar aggregation-induced emission (AIE) features. , Based on these observations, we proposed the clustering-triggered emission (CTE) mechanism, namely, the clustering of nonconventional chromospheres and subsequent electron cloud overlap to form extend conjugation with simultaneously conformation rigidification to rationalize the emission behaviors of these luminogens. , Such a mechanism was supported by further measurements of synthetic compounds and natural biomolecules, including polyacrylonitrile (PAN), poly­( N -hydroxysuccinimide methacrylate) (PNHSMA), nonaromatic amino acids, and poly­(amino acids) . Although more detailed photophysical processes and underlying insights of the nonconventional luminogens remain to be elucidated, current findings highly suggest that CTE mechanism does not only coincide with our observations, but can also apply to the other systems. ,,− …”

Recent advances in the development and applications of nonconventional luminescent polymers

“…Under UV illumination, these polymeric materials showed bright-blue emission (470-478 nm) with large Stokes shifts of over 110 nm. 107 The same research group also discovered the intrinsic fluorescence of a common non-conjugated compound, poly(N-vinylpyrrolidone) (PVP), a linear polymer with side-chain pyrrolidone rings (a lactam) connected to a simple polyethylene backbone. Although the monomer N-vinyl-2-pyrrolidone (NVP) was very weakly emissive, its polymer version PVP exhibited strong intrinsic fluorescence.…”

Anionic polymerization of nonaromatic maleimide to achieve full-color nonconventional luminescence

“…), intermolecular interactions, and aggregation/cluster. In addition, the luminescent nonconjugated polymers bearing succinimide side groups 42 or incorporated with maleimide units 43 have been discovered and their intrinsic emission can be controlled by regulating the aggregation of polymer chains. Maleimide is an important monomer.…”