Dipyrrin Zn&lt;SUP&gt;II&lt;/SUP&gt; Complexes with Functional Aryl Groups: Formation, Characterization, and Structures in the Solid State

Maeda, Hiromitsu; Hashimoto, Takashi; Fujii, Rika; Hasegawa, Masahiro

doi:10.1166/jnn.2009.j011

Cited by 19 publications

(21 citation statements)

References 21 publications

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“…The structures of zDIP3 and zDIP4 are similar to those published for zDIP1 and zDIP2. 54 The Zn–N bond lengths in the complexes range from 1.95 to 1.99 Å, while the Zn–O bond lengths in zDIP2′ and zDIP3′ vary between 1.95 and 1.97 Å. The zinc center in all the complexes adopts a distorted tetrahedral configuration with the two ligands held nearly perpendicular to each other.…”

Section: Results and Discussionmentioning

confidence: 93%

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 Discussionmentioning

confidence: 93%

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

et al. 2014

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“…3) [15,16]. In these compounds, formed by self-assembly, the Zn(II)-cation is coordinated to the dipyrrin chelate and the rotation of pyridyl group, relative to the dipyrrinato unit, is prohibited.…”

Section: Only In 2004 Itmentioning

confidence: 99%

“…Luminescent dimeric [Zn(dipyrrin)Cl] 2 complexes. Several H atoms and peripheral groups are omitted for clarity [15,16].…”

Section: A N U S C R I P Tmentioning

confidence: 99%

“…At the present time two main areas of influence on the fluorescence of dipyrrin luminophors are developed. The first using a new type of ligands with higher rigidity of molecules (N 2 O 2 -type [17][18][19][20][21] and N 3 -type [22]), and the second varies the nature of the complexing agent (d-and f-metals, [13,15,16,23] Ga(III) and…”

Section: A N U S C R I P Tmentioning

confidence: 99%

“…Several H atoms and peripheral groups are omitted for clarity [15,16]. [33,40,41]; [M 3 L 3 ] -trinuclear molecular triangle [42]; [M 4 L 4 ] -[2×2] grids [43]; [M 6 L 6 ] -hexagon structure (six-core molecular hexagon) [43].…”

Section: Fig 3 Luminescent Dimeric [Zn(dipyrrin)mentioning

confidence: 99%

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New luminophors based on the binuclear helicates of d-METALS with BIS(DIPYRRIN)S

et al. 2015

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Excited State Properties and Energy Transfer within Dipyrrin‐Based Binuclear Iridium/Platinum Dyads: The Effect of ortho‐Methylation on the Spacer

Bronner

Veiga

Guenet

et al. 2012

Chemistry A European J

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Luminescent cyclometalated iridium complexes based on pyridyl appended dipyrrin ligands were prepared and characterized both in the solid state and in solution. The functionalization of the peripheral pyridyl moiety causes dramatic changes on the emission properties of both mono- and hetero- binuclear complexes. A detailed photophysical investigation of the two mononuclear derivatives of the [(Ppy)(2)Ir(dpm-py)] family (Ppy=2-phenylpyridine, dpm-py=5-(4-pyridyl)dipyrrin) was carried out. Introduction of methyl groups at the 3 and 5 positions on the pyridyl unit diminishes the non-radiative rate constant by locking the peripheral pyridyl group orthogonally to the dipyrrinato plane. Thus, they limit the rotational degree of freedom, as well as the charge-transfer character of the excited state. The coordination of these two complexes to a cyclometalated [(dppy)Pt] fragment (dppy=2,6-diphenylpyridine) led to the formation of binuclear species in which the iridium and platinum complexes behave as acceptors and donors, respectively. In these heterobinuclear compounds, the methyl groups do not influence the energy transfer efficiency, which is estimated to be above 90 %. However, they do limit the charge-transfer character of the acceptor's excited state, as well as its rotational degree of freedom, thus avoiding the detrimental effect upon the photophysical performance.

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Dipyrrin Zn<SUP>II</SUP> Complexes with Functional Aryl Groups: Formation, Characterization, and Structures in the Solid State

Cited by 19 publications

References 21 publications

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

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

New luminophors based on the binuclear helicates of d-METALS with BIS(DIPYRRIN)S

Excited State Properties and Energy Transfer within Dipyrrin‐Based Binuclear Iridium/Platinum Dyads: The Effect of ortho‐Methylation on the Spacer

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