Hyperbranched Polyborate: A Non‐conjugated Fluorescent Polymer with Unanticipated High Quantum Yield and Multicolor Emission

Abstract

Non‐conjugated fluorescent polymers have attracted great attention due to their excellent biocompatibility and environmental friendliness. However, it remains a huge challenge to obtain a polymer with high fluorescence quantum yield (QY) and multicolor emission simultaneously. Herein, we reported three kinds of nonaromatic hyperbranched polyborates (P1–P3) with multicolor emission, surprisingly, P2 also exhibits an unanticipated high QY (54.1 %). The natural bond orbital (NBO) analysis and density functional theory (DFT) calculation results revealed that the synergistic effect of rigid BO3 planar and flexible carbon chain, as well as the through‐space dative bond in supramolecular aggregate, were the key factors contributing to the ultrahigh QY of P2. Moreover, the applications of P2 in Fe3+ ions detection and cell imaging were also investigated. This work provides a new perspective for designing non‐conjugated fluorescent polymers with both high QY and multicolor emission.

Facile Conversion of Water to Functional Molecules and Interfacial Polymers with Efficient Clusteroluminescence

“…8e and 8f. The resonance peaks of acetylene carbon of TMP at 74.0 and 75.8 ppm disappeared in the 13 C CP/MAS NMR spectrum of PTMP. Instead, two new resonance peaks of C=C (f, g) are observed.…”

“…Instead, two new stretching vibration peaks of C=C at 1617 cm −1 and C=C−O at 1116 cm −1 are observed. 52 The 13 C NMR spectrum of TMP and 13 C CP/MAS NMR spectrum of PTMP are also given in Figs. 8e and 8f.…”

“…The emission color of resultant films could be red-shifted to yellow, and the highest PLQY could reach 45.7% when the polymerization time was prolonged to 60 min, which is by far the relatively high value among reported CLgens with long-wavelength emission. 12,13 Further extending the time led to a slightly changed emission color and PLQY. Compared to traditional PIE in solution, this new phenomenon of IPIE happens in the liquid-liquid interface, which is a strictly confined space.…”

Clusterization-Triggered Emission of Waterborne Polyurethane: The Role of Carboxyl Groups

“…This is attributed to the formation of WPU−Fe 3+ complex, and the large charge radius ratio of Fe 3+ makes the intermolecular charge transfer of WPU to Fe 3+ occur. 25,36,37…”

Facile preparation of fluorescent non-conjugated polymer films with tunable multicolor photoluminescencevialayer-by-layer assembly

“…By employing polymerization, chemical crosslinking, or hydrothermal treatment methods, covalent bonds are formed among the polymer structures, which immobilize the sub-fluorophore groups, rigidify the structures and thus enhance the photoluminescence of these materials. 8 Previously, Tang et al synthesized non-conjugated hyperbranched polyborates, 13 which exhibited an unanticipated high quantum yield of 54.1%. In a pioneering study by Yang and co-workers, they reported various fluorescent non-conjugated polymer dots (NCPDs) prepared by the hydrothermal treatment.…”