2021
DOI: 10.1016/j.ccr.2020.213750
|View full text |Cite
|
Sign up to set email alerts
|

Heteroleptic trivalent chromium in coordination chemistry: Novel building blocks for addressing old challenges in multimetallic luminescent complexes

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
4
1

Citation Types

0
20
0

Year Published

2021
2021
2024
2024

Publication Types

Select...
7

Relationship

1
6

Authors

Journals

citations
Cited by 25 publications
(20 citation statements)
references
References 103 publications
0
20
0
Order By: Relevance
“…The Cr(III) water exchange rate, from the first hydration shell, is very low [23], which confers some inert features for ligand substitution [35]; consequently, it can be hypothesized that a strong interaction with some component of CHDG, acting as a ligand, takes place. Concomitantly, Cr(III) has high charge density when compared with Co(II) (the ionic radii of Co(II) and Cr(III) are 0.74 and 0.61 nm, respectively [36]). The digluconate shows a high affinity towards metal ions (for example, calcium and aluminum) and, consequently, it could be the referred ligand [37,38].…”
Section: Resultsmentioning
confidence: 99%
“…The Cr(III) water exchange rate, from the first hydration shell, is very low [23], which confers some inert features for ligand substitution [35]; consequently, it can be hypothesized that a strong interaction with some component of CHDG, acting as a ligand, takes place. Concomitantly, Cr(III) has high charge density when compared with Co(II) (the ionic radii of Co(II) and Cr(III) are 0.74 and 0.61 nm, respectively [36]). The digluconate shows a high affinity towards metal ions (for example, calcium and aluminum) and, consequently, it could be the referred ligand [37,38].…”
Section: Resultsmentioning
confidence: 99%
“…[24][25][26][27][28][29] These circumstances produce: (i) Cr( 4 T 2 → 4 A 2 ) fluorescence (green arrow in Scheme 1b) and (ii) Cr( 2 T 1 , 2 E → 4 A 2 ) phosphorescence (red arrows in Scheme 1b) with short excited-state lifetimes. 2,11 The situation changes for strong field [CrN 6 ] and [CrC 6 ] chromophores with Δ/B > 30 (Scheme 1a) because (i) the large energy gap ΔE = E( 4 T 2 ) − E( 2 T 1 , 2 E) prevents BISC and (ii) the intersystem crossing Cr( 4 T 2 → 2 T 1 , 2 E) process is fast. 30,31 This ensures an efficient feeding of the long-lived doublet Cr( 2 T 1 , 2 E) excited states (Scheme 1b) and phosphorescence dominates the emission process.…”
Section: Introductionmentioning
confidence: 99%
“…1). 33 Whereas [CrL x (CN) (6-2x) ] (3-2x)− (L = neutral didentate ligand, for example, 1,10-phenanthorline ( phen) or 2,2′ bipyridine (bipy)) or [CrL(CN) 3 ] (L = neutral facial tridentate ligand, for example, 1,4,7-triazacyclononane (tacn)) building blocks have been developed extensively for the design of magnetic clusters and assemblies, [2][3][4]14,19 their use as potential optical partners remained confidential. We are aware of one contribution exploring the systematic low-energy shift of the Cr( 2 T 1 , 2 E → 51 On the other side, the recent need for replacing the costly and rarest 4d (Ru) and 5d (Re, Os, Ir) metals with earth abundant 3d (Cr), 27,28,35,52,54 Mn (I) 52,54 or 4d (Mo) 55 analogues boosted the use of the rigid tridentate polyaromatic ligands 2,2′:6′,2″-terpyridine (tpy), N,N′dimethyl-N,N′-di( pyridine-2-yl)pyridine-2,6-diamine (ddpd) or 2,6-di(quinolin-8-yl)pyridine (dqp) ligands for tuning ligand-field and Racah parameters via chelate ring sizes, donor atoms and sterical constraints around Cr III in pseudo-octahedral homoleptic [CrL 2 ] 3+ (L = tpy, ddpd or dqp; Scheme 1a) [56][57][58] and heteroleptic [Cr(L)(L′)] 3+ complexes.…”
Section: Introductionmentioning
confidence: 99%
See 2 more Smart Citations