Substituent Effect on the Circularly Polarized Luminescence of C1-Symmetric Carbene-Copper(I) Complexes

The substituent effect on the magnitude of the circularly polarized luminescence (CPL) of (Ment)CAAC-Cu-X (X=F, Cl, Br, I, BH4, B3H8; CAAC=cyclic (alkyl)(amino)carbenes) complexes is experimentally investigated. This study examines seven pairs of enantiomeric complexes with small anionic substituents (halides, borohydrides, hydride). The complexes are fully characterized, including single crystal X-ray diffraction studies, and chiroptical measurements show that small covalent anions induce a larger CPL magnitude. These results demonstrate that the magnitude of the CPL can be manipulated without making any modifications to the chiral ligand.

Automated summary

Experimental investigation reveals that small covalent anions can increase the magnitude of circularly polarized luminescence (CPL) of (Ment)CAAC-Cu-X complexes, without the need for modifications to the chiral ligand.