Circularly Polarized Lanthanide Luminescence from Langmuir–Blodgett Films Formed from Optically Active and Amphiphilic Eu^III‐Based Self‐Assembly Complexes

The btp [2,6-bis(1,2,3-triazol-4-yl)pyridine] binding motif: a new versatile terdentate ligand for supramolecular and coordination chemistry

“…We have also employed dpa in the fabrication of chiral luminescent Langmuir-Blodgett films, which emit in the red and near infrared regions of the electromagnetic spectrum. 19,20 Earlier this year, we demonstrated the potential of dpa as a central core for the generation of [2]-and appendant arm on cyclen (1,4,7,10-tetraazacyclododecane) complexed Ln(III) structures (we also employed this f-d metal ion hybrid strategy for the recognition of nucleic acids). 56,58 So how well does the btp ligand compare to these classical examples listed above?…”

“…[16][17][18][19]53,58,[138][139][140][141] Hence they lend themselves to use in other applications such as in biological sensing, OLEDs, and as imaging agents, etc. 142,143 Flood and co-workers proved that btp-ligand 3a could form a stable coordination complex with Eu(III), which is to the best of our knowledge, the first example of such a system in the literature.…”

Near Infrared (NIR) Lanthanide Emissive Langmuir–Blodgett Monolayers Formed Using Nd(III) Directed Self-Assembly Synthesis of Chiral Amphiphilic Ligands

“…These changes are similar to that previously observed in our laboratory. 28 The fluorescence emission was also monitored upon excitation at 281 nm, which was quenched upon addition of Nd(III). But both ligands were not strongly fluorescent and the changes were not analyzed further.…”

“…28 Furthermore, recently we have also shown that chiral Eu III based complexes can be transferred to the surface of quartz solid substrates by utilizing the Langmuir-Blodgett technique, and the retention of photophysical properties is again observed, including retention of circularly polarized luminescence (CPL). 28 With the view of extending out interest in the development of functional lanthanide luminescent structures, we set out to form highly organized Langmuir monolayers formed by using lanthanide directed self-assembly from NIR emitting lanthanides. Furthermore, our objective was to then transfer these monolayers onto solid supports, giving rise to new surface bound materials with additional advantages over other solid matrix immobilization techniques currently being employed such as deposition precision, order and control.…”

“…Synthesis and characterization: Ligands 1 and 2 were prepared according to our previously reported procedure, as shown in Scheme 1. 28 In addition colorless, X-ray quality rod shaped single crystals of 1 were obtained from the slow evaporation of a CH 3 CN/CH 2 Cl 2 solution and the low temperature (123 K) structure determined. 1 crystallized in the chiral, monoclinic space group, P2 1 , and contained two crystallographically independent molecules in the asymmetric unit as shown in Figure 1 (See also Supporting Information) and Table 1.…”