Samarium complexes with the highest quantum yields to date have been synthesized, and their luminescence properties were studied in 12 solvents. Sensitization via a nontriplet intraligand charge-transfer pathway was also successfully demonstrated in solution states with good quantum yields.
Chirality is ubiquitous within biological systems where many of the roles and functions are still undetermined. Given this,there is aclear need to design and develop sensitive chiral optical probes that can function within ab iological setting.Here we report the design and synthesis of magnetically responsive Circularly Polarized Luminescence (CPL) complexes displaying exceptional photophysical properties (quantum yield up to 31 %a nd j g lum j up to 0.240) by introducing chiral substituents onto the macrocyclic scaffolds.M agnetic CPL responses are observed in these chiral Eu III complexes, promoting an exciting development to the field of magnetooptics.The j g lum j of the 5 D 0 ! 7 F 1 transition increases by 20 % from 0.222 (0 T) to 0.266 (1.4 T) displaying al inear relationship between the Dg lum and the magnetic field strength. These Eu III complexes with magnetic CPL responses,p rovides potential development to be used in CPL imaging applications due to improved sensitivity and resolution.
One-step cyclization of a tetraazamacrocycle 5 with 70% yield in a 25-gram scale was performed. Its chiral DOTA derivatives, L4, has around 93% of TSAP coordination isomer in its Eu(III) and Yb(III) complexes in aqueous solution. [GdL4] 5exhibits a high relaxivity, making it a promising and efficient MRI contrast agent. High glum values of 0.285 (J = 1) for [TbL3]and 0.241 (J = 1) for [TbL4] 5in buffer solutions were recorded.
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