Right-/left-handed helical G-quartet nanostructures with full-color and energy transfer circularly polarized luminescence

Abstract

<p>Right- and left-handed helical G-quartet nanostructures are synthesized for the first time simultaneously <italic>via</italic> 5′-guanosine monophosphate (GMP) self-assembly, and further applied as circularly polarized luminescence (CPL) templates.</p>

Adaptive Chirality of an Achiral Cage: Chirality Transfer, Induction, and Circularly Polarized Luminescence through Aqueous Host–Guest Complexation

“…Although partial CD signals showed inversion, the Cotton effect was still negative at the long-wavelength range, strongly suggesting the formation of a homodirectional PP complex (PP-1⊃G 2 ). The confined space of the cage could change the syn-and anti-conformations of ribose units in G and G 2 , 118,119,123,124 which could influence the pyridinium-phenylene torsional angles of the TPE units to induce partial CD inversion. Furthermore, excess G did not cause obvious changes in the dissymmetry factor, supporting the saturated binding ratio of 1 and G being 1:2 (Figure 5d, inset).…”

Kinetic control of chirality and circularly polarized luminescence in G-quartet materials

“…Meanwhile, when quartets stack through the same face (heteropolar, headto-head or tail-to-tail), the CD signals are opposite to that displayed in homopolar stacking in the specific wavelength range. 14,27 Therefore, we believe that the ordered head-to-tail stacking occurred in the slow formation process, while heteropolar stacking occurred in the fast formation process.…”

“…13 Our group recently reported the right-and left-helical G-quartet nanostructures through the self-assembly of guanosine monophosphate (GMP), and found that their helix-handedness is regulated by metal ions. 14 However, the reason for the reversal of helix-handedness is still a mystery, and more research is needed.…”

“…24 Our group has demonstrated that G-quadruplex DNA and G-quartet nanostructures can be used as excellent CPL templates with a large luminescence dissymmetry factor (g lum ). 14,25 In addition to g lum , another characteristic that CPL-active materials should have is switchability, because the switch property is an indispensable part of applications. 26 The switch between thermodynamic equilibrium state and kinetically trapped state may be a good way to design switchable CPL-active materials.…”

“…9 Our group previously reported the right-handed helix G-quartet structure assembled by 50 mM GMP and 8 mM Sr 2+ in a 4 1C refrigerator, and found that low temperature is the necessary condition for assembly at this concentration. 14 Also, temperature is an important factor in self-assembly, which not only determines the degree of selfassembly, but also determines the self-assembly rate. Therefore, in this study, the self-assembly temperature was taken as the research object, and the effect of self-assembly temperature on helix-handedness was discussed.…”