Analysis of TCSPC data: a comparative evaluation of deterministic and probabilistic approaches

Smith, Deb; McKenzie, Grant; Jones, Anita C.; Smith, Trevor A.

doi:10.7488/ds/2093

Cited by 1 publication

(2 citation statements)

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“…The two derived emission lifetimes are too similar for accurate analysis by time-correlated, single-photon counting [63] while the fractional contributions remained constant across the full wavelength range. Moreover, it is difficult to explain why a dual-exponential model should be appropriate in this case.…”

Section: Optical Properties For Crystalline Samples Of Mbfmentioning

confidence: 89%

“…Fluorescence decay curves, measured at selected wavelengths across the range 600 to 690 nm, could not be analyzed satisfactorily in terms of mono-exponential kinetics. The fits to dual-exponential kinetics were much improved in terms of residual statistics [63] but required the inclusion of an unrealistically short-lived component, typically 30-80 ps, to account for the effects of scattering. The lifetimes, averaged over many samples, were 1.3 � 0.1 ns (80 %) and 2.95 � 0.3 ns (20 %), leading to an expectation lifetime of ca.…”

Section: Optical Properties For Crystalline Samples Of Mbfmentioning

confidence: 99%

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A BF₂ Chelate Exhibiting Excimer‐like Fluorescence with an Unusually Large Stokes Shift in the Crystalline Phase

Bozdemir

Woodford

Waddell

et al. 2023

Chemistry A European J

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The target mono-BF 2 complex is weakly emissive in fluid solution because radiationless decay of the excitedsinglet state is promoted through an intramolecular N•••HÀ N hydrogen bond. The lack of mirror symmetry for this compound is attributed to vibronic effects, as reported previously for the bis-BF 2 complex (BOPHY). Red-shifted fluorescence is observed from single crystals, the emission quantum yield approaching 30 % with a fluorescence lifetime of 2 ns. The large Stokes shift of 5,700 cm À 1 helps minimize self-absorption. Crystallography indicates that the internal fold and twist angles are increased substantially in the crystal, but the hydrogen bond is weakened relative to solution. The crystal structure is compiled from pairs of head-to-tail molecules having a shift of ca. 4.1 Å and closest approach of ca. 3.5 Å. These molecular pairs are arranged in columns, which, in turn, assemble into sheets. The proximity favors excitonic coupling between individual molecules, with the coupling strength obtained by analysis of the absorption spectrum reaching ca. 1,000 cm À 1 . Both the ideal dipole approximation and the extended dipole methodology seriously overestimate the coupling strength, but the atomic transition charge density procedure leads to good agreement with experiment. Emission is attributed to the closely coupled molecular pair functioning in an excimer-like manner with the exciton trapped in a local minimum. Increasing temperature causes a slight blue shift and loss of fluorescence.

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Section: Optical Properties For Crystalline Samples Of Mbfmentioning

confidence: 89%

Section: Optical Properties For Crystalline Samples Of Mbfmentioning

confidence: 99%

A BF₂ Chelate Exhibiting Excimer‐like Fluorescence with an Unusually Large Stokes Shift in the Crystalline Phase

Bozdemir

Woodford

Waddell

et al. 2023

Chemistry A European J

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Analysis of TCSPC data: a comparative evaluation of deterministic and probabilistic approaches

Cited by 1 publication

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A BF₂ Chelate Exhibiting Excimer‐like Fluorescence with an Unusually Large Stokes Shift in the Crystalline Phase

A BF₂ Chelate Exhibiting Excimer‐like Fluorescence with an Unusually Large Stokes Shift in the Crystalline Phase

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Analysis of TCSPC data: a comparative evaluation of deterministic and probabilistic approaches

Cited by 1 publication

References 0 publications

A BF2 Chelate Exhibiting Excimer‐like Fluorescence with an Unusually Large Stokes Shift in the Crystalline Phase

A BF2 Chelate Exhibiting Excimer‐like Fluorescence with an Unusually Large Stokes Shift in the Crystalline Phase

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A BF₂ Chelate Exhibiting Excimer‐like Fluorescence with an Unusually Large Stokes Shift in the Crystalline Phase

A BF₂ Chelate Exhibiting Excimer‐like Fluorescence with an Unusually Large Stokes Shift in the Crystalline Phase