Heteroleptic zinc dipyrromethene complexes

Amiri, Asghar; Comeau, Ian; Thompson, Alison

doi:10.1002/jhet.5570430225

Cited by 8 publications

(14 citation statements)

References 30 publications

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“…Of the three ancillary ligands examined, pentane-2,4-dione (acac), 1,1,1,5,5,5-hexafluoropentane-2,4-dione, and 2,2,6,6-tetramethyl-3,5-heptanedione (dpm), pure heteroleptic complexes were successfully isolated only using the dpm ligand. As seen for other heteroleptic Zn complexes, 43 , 56 zDIP2′ and zDIP3′ disproportionate to their respective homoleptic complexes (zDIP2 and zDIP3) in chloroform over the course of several hours, as observed by NMR measurements (see SI ). However, zDIP2′ and zDIP3′ are stable in the solid state and can be sublimed under vacuum without disproportionation.…”

Section: Results and Discussionsupporting

confidence: 58%

Symmetry-Breaking Charge Transfer of Visible Light Absorbing Systems: Zinc Dipyrrins

et al. 2014

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Zinc dipyrrin complexes with two identical dipyrrin ligands absorb strongly at 450–550 nm and exhibit high fluorescence quantum yields in nonpolar solvents (e.g., 0.16–0.66 in cyclohexane) and weak to nonexistent emission in polar solvents (i.e., <10–3, in acetonitrile). The low quantum efficiencies in polar solvents are attributed to the formation of a nonemissive symmetry-breaking charge transfer (SBCT) state, which is not formed in nonpolar solvents. Analysis using ultrafast spectroscopy shows that in polar solvents the singlet excited state relaxes to the SBCT state in 1.0–5.5 ps and then decays via recombination to the triplet or ground states in 0.9–3.3 ns. In the weakly polar solvent toluene, the equilibrium between a localized excited state and the charge transfer state is established in 11–22 ps.

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Section: Results and Discussionsupporting

confidence: 58%

Symmetry-Breaking Charge Transfer of Visible Light Absorbing Systems: Zinc Dipyrrins

et al. 2014

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“…Despite the difference in structure of quenchers 6 and 7, their absorption maxima are similar (557 and 559 nm respectively) and in line with previous studies [16,17]. Their B bands (Soret bands) are in the range of approximately 590-610 and 580-605 nm respectively.…”

Section: Characterisation Of Quencher Spectroscopic Propertiessupporting

confidence: 90%

Synthesis of quenchers to control the fluorescence of Rhodamine B and improve the contrast ratio of blue filters for LCDs

Lee

Kwon²,

Oh³

et al. 2016

Coloration Technology

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In this study, seven quenchers (derived from either anthraquinone, phthalimidylazo, or dipyrromethene chromophores) were prepared as candidates for additives to suppress fluorescence in blue colour filters and thus improve their contrast ratio. To reduce fluorescence effectively, quenchers must have typical properties such as spectral compatibility by which the absorbance spectrum of the quencher overlaps the fluorescence emission spectrum, exhibit high molar extinction coefficients, and exert little influence on the colour of the blue filter. The seven quenchers possessed absorption maxima of approximately 570-620 nm and reduced fluorescence (by more than 24%). Those quenchers tested in filter coatings increased their contrast ratios by about 50%. They thus effectively quenched fluorescence of the blue filter but without greatly affecting the chromaticity coordinates of the filters.

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“…However, mono(dipyrrinato)zinc(II) complexes easily decomposed, or they disproportionated into the corresponding bis(dipyrrinato)zinc(II) complexes 6. 7 Thus, the improvement of ϕ F in dipyrrinato zinc(II) complexes leaves room for further investigation.…”

Section: Optical Properties Of the Bis(dipyrrinato)zinc(ii) Complexesmentioning

confidence: 99%

An Extremely Bright Heteroleptic Bis(dipyrrinato)zinc(II) Complex

Kusaka

Sakamoto

Kitagawa

et al. 2012

Chemistry An Asian Journal

102

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Let your light shine: The first example of a heteroleptic bis(dipyrrinato)zinc(II) complex, 7a, was synthesized from two types of dipyrrins prepared by a new deboration protocol for BODIPYs. Complex 7a showed a higher fluorescence quantum yield (0.76 in toluene) than the corresponding homoleptic complexes 5a and 6. The superiority of 7a as a luminophore was more prominent in more polar CH2Cl2 (see picture).

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Heteroleptic zinc dipyrromethene complexes

Cited by 8 publications

References 30 publications

Symmetry-Breaking Charge Transfer of Visible Light Absorbing Systems: Zinc Dipyrrins

Symmetry-Breaking Charge Transfer of Visible Light Absorbing Systems: Zinc Dipyrrins

Synthesis of quenchers to control the fluorescence of Rhodamine B and improve the contrast ratio of blue filters for LCDs

An Extremely Bright Heteroleptic Bis(dipyrrinato)zinc(II) Complex

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