Induced optical activity in the terbium(III) complex of pyridine-2,6-dicarboxylic acid through association with resolved tris(ethylenediamine)chromium(III)

Madaras, John S.; Brittain, Harry G.

doi:10.1021/ic50214a051

Cited by 15 publications

(1 citation statement)

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“…This | g lum | value is quite high compared with p-block systems and with 4d- and 5d-block-based complexes, which confirms the potential of Cr III ions for inducing large g lum . Despite those promising results, only scarce studies focused on Cr III complexes reported CPL measurements in condensed phases (Manson and Shah, 1977 ; Yamaga et al, 1990 ; Nobuhiro et al, 2001 ; Anzai et al, 2003 , 2006 ; Seyler et al, 2018 ), or in solution except for some triple helical complexes [Cr(en) 3 ] 3+ (Madaras and Brittain, 1980 ; Morita et al, 1984 ; Herren et al, 1996 ), [Cr(ox) 3 ] 3+ (ox = oxalate) (Herren et al, 1996 ), [Cr(pn) 3 ] 3+ (pn = 1,2-propanediamine) (Morita et al, 1984 ; Herren et al, 1996 ), and [Cr(ala) 3 ] (ala = alaninato) (Tsubomura et al, 1988 ; Taro et al, 1991 ).…”

Section: Extension Toward 3d Metal Complexes the Promising Case Of Ementioning

confidence: 99%

Beyond Chiral Organic (p-Block) Chromophores for Circularly Polarized Luminescence: The Success of d-Block and f-Block Chiral Complexes

2020

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Chiral molecules are essential for the development of advanced technological applications in spintronic and photonic. The best systems should produce large circularly polarized luminescence (CPL) as estimated by their dissymmetry factor ( g lum ), which can reach the maximum values of −2 ≤ g lum ≤ 2 when either pure right- or left-handed polarized light is emitted after standard excitation. For matching this requirement, theoretical considerations indicate that optical transitions with large magnetic and weak electric transition dipole moments represent the holy grail of CPL. Because of their detrimental strong and allowed electric dipole transitions, popular chiral emissive organic molecules display generally moderate dissymmetry factors (10 −5 ≤ g lum ≤ 10 −3 ). However, recent efforts in this field show that g lum can be significantly enhanced when the chiral organic activators are part of chiral supramolecular assemblies or of liquid crystalline materials. At the other extreme, chiral Eu III - and Sm III -based complexes, which possess intra-shell parity-forbidden electric but allowed magnetic dipole transitions, have yielded the largest dissymmetry factor reported so far with g lum ~ 1.38. Consequently, 4f-based metal complexes with strong CPL are currently the best candidates for potential technological applications. They however suffer from the need for highly pure samples and from considerable production costs. In this context, chiral earth-abundant and cheap d-block metal complexes benefit from a renewed interest according that their CPL signal can be optimized despite the larger covalency displayed by d-block cations compared with 4f-block analogs. This essay thus aims at providing a minimum overview of the theoretical aspects rationalizing circularly polarized luminescence and their exploitation for the design of chiral emissive metal complexes with strong CPL. Beyond the corroboration that f–f transitions are ideal candidates for generating large dissymmetry factors, a special attention is focused on the recent attempts to use chiral Cr III -based complexes that reach values of g lum up to 0.2. This could pave the way for replacing high-cost rare earths with cheap transition metals for CPL applications.

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