Long-lived platinum(ii) diimine complexes with broadband excited-state absorption: efficient nonlinear absorbing materials

Liu, Rui; Azenkeng, Alexander; Li, Yuhao; Sun, Wenfang

doi:10.1039/c2dt31267k

Cited by 34 publications

(42 citation statements)

References 28 publications

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“…1, along with the ground-state absorption spectrum. The fs TA spectrum measured at long time delay is consistent with the ns TA data reported in [19]. Fitting the fs TA decay data at a number of randomly selected wavelengths and averaging the results yields a value of 83.5 ± 39 ps for the singlet-state lifetime s S ; the relatively large uncertainty reflects the large variation in the fitting results at different wavelengths.…”

Section: Femtosecond Transient Difference Absorption Spectrasupporting

confidence: 68%

“…The linear absorption spectrum, indicated by the black line in the right-hand panel of Fig. 1 [19] for bpyPt(C"CAFAC"CANI) 2 in acetonitrile, a significantly more polar solvent.…”

Section: Experimental Measurementsmentioning

confidence: 99%

“…The bpyPt(C"CAFAC"CANI) 2 complex was synthesized as described in [19] and fully characterized by UV-vis, 1 H NMR, high-resolution mass spectroscopy, and elemental analysis. The linear absorption spectrum, indicated by the black line in the right-hand panel of Fig.…”

Section: Experimental Measurementsmentioning

confidence: 99%

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Long-lifetime reverse saturable absorption in a bipyridyl platinum(II) complex bearing naphthalimidylethynyl-substituted fluorenylacetylide ligands

et al. 2015

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a b s t r a c tBy fitting femtosecond transient difference absorption time series at multiple wavelengths, the singlet excited-state lifetime of a particular platinum(II) 2,2 0 -bipyridyl complex bearing naphthalimidylethynyl-substituted fluorenyl-acetylide ligands was determined to be 83.5 ± 39 ps in toluene solution. A triplet quantum yield of 0.06 was measured using relative actinometry. Excited-state absorption cross sections of 5.6 Â 10 À17 cm 2 (singlet) and 7.8 Â 10 À16 cm 2 (triplet) at 532 nm were obtained by using a

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Section: Femtosecond Transient Difference Absorption Spectrasupporting

confidence: 68%

“…The linear absorption spectrum, indicated by the black line in the right-hand panel of Fig. 1 [19] for bpyPt(C"CAFAC"CANI) 2 in acetonitrile, a significantly more polar solvent.…”

Section: Experimental Measurementsmentioning

confidence: 99%

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Long-lifetime reverse saturable absorption in a bipyridyl platinum(II) complex bearing naphthalimidylethynyl-substituted fluorenylacetylide ligands

et al. 2015

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“…Although there is a difference, the overall electronic similarities seen near the center of each aromatic unit are attributable, at least in part, to delocalization of the MAN electron-density onto the NI unit through the alkyne linker. 39,40 …”

Section: Resultsmentioning

confidence: 99%

Time-Dependent Solid-State Polymorphism of a Series of Donor–Acceptor Dyads

Peebles

Alvey

Lynch

et al. 2013

Crystal Growth & Design

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In order to exploit the use of favorable electrostatic interactions between aromatic units in directing the assembly of donor-acceptor (D-A) dyads, the present work examines the ability of conjugated aromatic D-A dyads with symmetric side chains to exhibit solid-state polymorphism as a function of time during the solid formation process. Four such dyads were synthesized and their packing in the solid-state from either slower (10-20 days) or faster (1-2 days) evaporation from solvent was investigated using single crystal X-ray analysis and powder X-ray diffraction. Two of the dyads exhibited tail-to-tail (A-A) packing upon slower evaporation from solvent and head-to-tail (D-A) packing upon faster evaporation from solvent. A combination of single crystal analysis and XRD patterns were used to create models wherein a packing model for the other two dyads is proposed. Our findings suggest that while side chain interactions in asymmetric aromatic dyads can play an important role in enforcing segregated D-A dyad assembly, slowly evaporating symmetrically substituted aromatic dyads allows for favorable electrostatic interactions between the aromatic moieties to facilitate the organization of the dyads in the solid-state.

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“…1 First, the complexes usually show very weak absorption in visible spectral region, and the absorption is usually in UV or blue range of the spectrum. 20 −26 Very few complexes show absorption in visible spectra range. 27−30 Second, the lifetime of the triplet excited state is usually short, less than 10 μs.…”

Section: ■ Introductionmentioning

confidence: 99%

Near-IR Broadband-Absorbing trans-Bisphosphine Pt(II) Bisacetylide Complexes: Preparation and Study of the Photophysics

Yang

Karatay²,

Zhao

et al. 2015

Inorg. Chem.

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Broadband near-IR absorbing trans-bis(trialkylphosphine) Pt(II) bisacetylide binuclear complex (Pt-1) was prepared with boron-dipyrromethene (Bodipy) and styrylBodipy acetylide ligands. Pt-1 shows strong absorption bands at 731 and 503 nm. Singlet energy transfer (EnT) and efficient intersystem crossing of the central coordinated Bodipy ligand were proposed to be responsible for the efficient funneling of the excitation energy to the triplet-state manifold. Reference complexes containing only a single Bodipy ligand were prepared for comparison (with styrylBodipy ligand Pt-0 or Bodipy ligand Pt-2). The molecular structures were confirmed by single-crystal X-ray diffraction. The photophysical properties were studied with steady-state and time-resolved transient absorption spectroscopies, electrochemical characterization, and density functional theory/time-dependent density functional theory calculations. Dual fluorescence was observed for Pt-1. Singlet EnT in Pt-1 was proposed based on the fluorescence quenching/excitation spectra, and femtosecond transient absorption spectra (energy transfer rate constant kEnT = 2.2 × 10(10) s(-1)). With nanosecond transient absorption spectra, intramolecular triplet-state energy transfer in Pt-1 was proved. Gibbs free energy changes of charge separation indicate that the photoinduced intramolecular electron transfer in Pt-1 is thermodynamically prohibited. Intermolecular triplet transfer between Pt-2 and L-1 was studied with nanosecond transient absorption spectra; the EnT rate and energy transfer efficiency were determined as 3.6 × 10(4) s(-1) and 94.5%, respectively. The singlet oxygen ((1)O2) photosensitizing of Pt-1 was improved as compared to the complexes containing only a single visible-light-absorbing chromophore.

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Long-lived platinum(ii) diimine complexes with broadband excited-state absorption: efficient nonlinear absorbing materials

Cited by 34 publications

References 28 publications

Long-lifetime reverse saturable absorption in a bipyridyl platinum(II) complex bearing naphthalimidylethynyl-substituted fluorenylacetylide ligands

Long-lifetime reverse saturable absorption in a bipyridyl platinum(II) complex bearing naphthalimidylethynyl-substituted fluorenylacetylide ligands

Time-Dependent Solid-State Polymorphism of a Series of Donor–Acceptor Dyads

Near-IR Broadband-Absorbing trans-Bisphosphine Pt(II) Bisacetylide Complexes: Preparation and Study of the Photophysics

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