Circularly polarized luminescence from helical N,O-boron-chelated dipyrromethene (BODIPY) derivatives

Abstract

We report N,O-Boron-chelated dipyrromethenes derivatives manifesting circularly polarized luminescence (CPL) in red/near-infrared region both in solution and aggregation state. The CPL is originated from the helical chirality through intramolecular substitution...

Remarkable 980 nm circularly polarized luminescence from dinuclear Yb(iii) helicates with aD4symmetry

“…[55][56][57] Moreover, except for the lanthanide complexes that can cover the emission wavelengths from 800 to 1500 nm, the other luminophores can only emit the bands near the deep-red regions, with the emission tails generally limited within 900 nm. [58][59][60][61][62][63][64] For NIR-CPL materials, the other important issue to be considered is how to improve the luminescence dissymmetry factor (g lum ). Benefitting from the magnetic dipole feature of the partial f-f transition of the lanthanide ions, the Ln complexes generally display higher g lum values (10 −2 -0.5) than those of other CPL luminophores (g lum = 10 −5 -10 −2 ).…”

“…55–57 Moreover, except for the lanthanide complexes that can cover the emission wavelengths from 800 to 1500 nm, the other luminophores can only emit the bands near the deep-red regions, with the emission tails generally limited within 900 nm. 58–64…”

Synthesis and stereochemistry of chiral aza-boraspirobifluorenes with tetrahedral boron-stereogenic centers

“…13 Due to the high stability of the B–C bonds, BC 4 boranes exhibit high stereochemical stability. 14 To date, chiral tetrahedral boranes with B–N, 15–27 B–O, 28–31 B–H, 32,33 and boron–heteroatom 34–37 bonds have been synthesized and the stereochemistry of the compounds has been studied extensively. For example, Toyota has reported stable chiral tetrahedral boranes with three B–C bonds and one B–N bond (BC 3 N), and examined the racemization process (Fig.…”

Dynamically stable co-assembled supramolecular BOPPY systems with chiral amplification

“…These results are similar to those obtained for most of the available BF 2 dyes. 4 b , c ,5,10 In contrast, ( S / R )- 1a exhibit stronger solid CPL signals with ten times magnification of g lum reaching up to 1.7 × 10 −3 (Fig. S1a and b, ESI†).…”

“…Compared with the small organic molecules, 4 chiral supramolecular assemblies based on weak non-covalent interactions, such as hydrogen bonds, π–π, or hydrophobic and electrostatic interactions, have been proved to be intriguing and efficient systems for fabricating various ordered nanostructures. 5 Among these nanostructures, helices, twists, and springs with intrinsic chirality or spatial asymmetry have garnered significant attention due to their captivating characteristics and numerous applications. 6 Moreover, the assembly process can effectively induce chiral or achiral molecules to form helical nanostructures, significantly amplifying their CPL activity and enhancing their corresponding g lum values.…”