Sensitization of Ln^III (Ln = Eu, Tb, Tm) Ion Luminescence by Functionalized Polycarbonate‐Based Materials and White Light Generation

Abstract

Abstract:We prepared pyridine-2,6-bis(ethyl)ester [BEP] and pyridine-2,6-bis(diethylamide) [BDP] polymers with polycarbonate backbones by ring-opening polymerization of the pyridinebis(ethyl)ester and pyridine-bis(diethylamide) units appended to a cyclic carbonate via a glycol chain. The polymers were characterized by FTIR, NMR, UV/Vis absorption and fluorescence spectroscopy, as well as SEC, powder XRD, DSC, and TGA. The measured glass transition temperature (T g ) of the BEP polymer was shifted from -32°C to -7 and -8°C after coordination of the Eu III and Tb III ions, respectively. Similarly, the T g of the BDP

Overcoming Barriers in Polycarbonate Synthesis: A Streamlined Approach for the Synthesis of Cyclic Carbonate Monomers

“…Aliphatic cyclic carbonates are a versatile and widely used monomer scaffold for the preparation of polycarbonates, copolymers, and non-isocyanate polyurethanes. − These materials find application in a variety of domains including drug-delivery vehicles, − antimicrobial materials, − macromolecular chemotherapeutics, , covalent adaptable networks, materials for three-dimensional (3D) printing, surface patterning, , heavy-metal sequestration, magnetic resonance imaging contrast agents, computed tomography imaging, solid-phase electrolytes for ion transport, , and luminescent polymers for white light generation . One of the most commonly used monomer precursors is 2,2-bis­(hydroxymethyl)­propionic acid (bis-MPA; Figure A) as the installment of various functional groups via esterification enables fine-tuning of the properties of the derived polymers.…”

“…1−3 These materials find application in a variety of domains including drug-delivery vehicles, 4−6 antimicrobial materials, 7−9 macromolecular chemotherapeutics, 10,11 covalent adaptable networks, 12 materials for three-dimensional (3D) printing, 13 surface patterning, 14,15 heavy-metal sequestration, 16 magnetic resonance imaging contrast agents, 17 computed tomography imaging, 18 solid-phase electrolytes for ion transport, 19,20 and luminescent polymers for white light generation. 21 One of the most commonly used monomer precursors is 2,2-bis-(hydroxymethyl)propionic acid (bis-MPA; Figure 1A) as the installment of various functional groups via esterification enables fine-tuning of the properties of the derived polymers. Despite the low monetary cost of bis-MPA and the breadth of materials utilizing cyclic bis-MPA-based carbonate monomers, their synthesis usually requires multiple steps, the use of toxic reagents, and tedious purifications.…”

1O2 Generating Luminescent Lanthanide Complexes with 1,8-Naphthalimide-Based Sensitizers

“…Due to shielding of the 4 f orbitals by the filled 5 s and 5 p orbitals, these transitions are not significantly altered by the ion’s environment. This leads to characteristic emission with high color purity making luminescent Ln III complexes great candidates for application as imaging agents, , as sensors, as anti-counterfeiting inks, and in optics. , However, direct excitation of Ln III ions is inefficient due to the parity-forbidden nature of the f – f transitions, which leads to low extinction coefficients. A sensitizer (or antenna) is coordinated to the metal ion to promote Ln III -centered emission, in a process called the antenna effect .…”

White-light emitting multi-lanthanide terephthalate thin films by atomic/molecular layer deposition

“…However, these wide-band materials usually show weak emission intensity and poor colour purity, and lack the long-term stability. 3,4 Trivalent lanthanide (Ln) ions with their parity-forbidden f-f transitions are the most widely employed components of coloured LEDS. 5 The spatially extended 5s and 5p orbitals of the Ln 3+ ions offer shielding to the 4f electrons, which makes the emission wavelengths independent of the host lattice or the ligand environment.…”