Quantum mechanics

Supramolecular chemistry

Photochemistry

Metallurgy

Materials science

Density functional theory

Molecule

Quantum yield

Polymer

Physics

Nanotechnology

Organic chemistry

Natural bond orbital

Optics

Fluorescence

Computational chemistry

Biocompatibility

Conjugated system

Composite material

Chemistry

Angewandte Chemie International Edition

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 BO 3 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 Fe 3+ 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.

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