Spectroscopic mapping of the gold complex oligomers (dimer, trimer, tetramer, and pentamer) by excited-state coherent nuclear wavepacket motion in aqueous solutions

Iwamura, Michiko; Urayama, Rina; Fukui, Airi; Nozaki, Koichi; Liu, Li; Kuramochi, Hikaru; Takeuchi, Satoshi; Tahara, Tahei

doi:10.1039/d2cp04823j

Cited by 1 publication

(3 citation statements)

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“…To obtain such information, we must correct both steady-state and time-resolved spectra at various concentrations. 5,23 It is beneficial to obtain such spectroscopic information for typical metallophilic Pt(II) oligomers. Very recently, spectroscopic assignments of the emission and absorption bands for trimer and tetramer of [Pt(CN) 4 ] 2− , which is one of the most primal and standard Pt complexes, 1 in aqueous solutions were altered by our detailed analysis of the concentration dependence of the steady-state and time-resolved spectroscopic data.…”

Section: Introductionmentioning

confidence: 99%

“…One of the reasons for this is that those various oligomers, such as dimers, trimers, and larger oligomers, are in equilibrium in solutions in the ground state. Furthermore, the equilibriums in the excited states are usually considerably different from those in the ground states. ,, Therefore, the excited-state dynamics include not only intramolecular processes such as intrinsic decay but also intermolecular processes such as the formation of larger oligomers via diffusion and/or dissociation of the oligomers. To obtain such information, we must correct both steady-state and time-resolved spectra at various concentrations. , …”

Section: Introductionmentioning

confidence: 99%

“…It is beneficial to obtain such spectroscopic information for typical metallophilic Pt(II) oligomers. Very recently, spectroscopic assignments of the emission and absorption bands for trimer and tetramer of [Pt(CN) 4 ] 2– , which is one of the most primal and standard Pt complexes, in aqueous solutions were altered by our detailed analysis of the concentration dependence of the steady-state and time-resolved spectroscopic data . With the help of the detailed and certain spectroscopic data of the oligomers, we succeeded in analyzing ultrafast spectroscopic data for these oligomers to elucidate the processes of structural changes and intersystem crossings of these oligomers.…”

Section: Introductionmentioning

confidence: 99%

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Kinetic Analysis of Excited-State Dynamics of Emissive Oligomers of Pt(II) Complex in Solution

Watanabe,

Iwamura,

Nozaki

2024

Inorg. Chem.

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Metrics & MoreArticle Recommendations * sı Supporting InformationABSTRACT: [Pt(NCN)MeCN] + (NCN = 1,3-di(2-pyridyl)benzene, MeCN = acetonitrile) forms oligomers, such as dimers and trimers, in solutions due to metallophilic interactions. The emission and absorption spectra in the visible region are considerably changed by the concentrations of the solutions because the excitation energy of the oligomers is dependent on the degree of oligomerization. In this study, excited-state dynamics of [Pt(NCN)MeCN] + in acetonitrile were investigated by timeresolved emission spectroscopy in time regions from microseconds to nanoseconds at various concentrations. The time-resolved emission spectra recorded with 355 nm photoexcitation showed the decay of the blue−green emission and the rise of the red emission in the microsecond time region. Stern−Volmer analysis of the time-resolved data at various concentrations and wavelengths provides two bimolecular rate constants (4.1 × 10 9 and 8.2 × 10 8 M −1 s −1 ) for the formation processes of the excited-state T 1 dimer and T 1 trimer, respectively. Kinetic parameters, such as the intrinsic decay rate constants of the T 1 monomer, T 1 dimer, and T 1 trimer, and the association and dissociation rate constants of the T 1 dimer and T 1 trimer were estimated by fitting the time-resolved emission data at various concentrations.

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Section: Introductionmentioning

confidence: 99%