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• W2039129472 abstract "Luminescence and excitation of luminescence vibronic spectra as well as IR and Raman spectra of europium nitrates with 1,10-phenanthroline derivatives of formula Eu(NO3)3.Ph2 were studied. The effect of size of ligands and their effective charges on crystal structure and, as a consequence, on spectroscopic characteristics was investigated under conditions where one type of ligand (NO3− group) is sufficiently rigid. The second ligand, heterocyclic diimine, can change its size and donor-acceptor properties when the substituents are varied. Stark splittings and relative intensities of the Eu3+ electronic transitions, the behaviour of vibration frequencies, and vibronic interaction were studied. It was demonstrated that nitrates under investigation have identical composition but form two different structural groups with small and bulky phenanthroline derivatives due to the influence of steric factor. All nitrate anions in the compounds are coordinated and the Eu-O (NO3−) bonds are relatively strong. The values of the splitting of stretching vibrations of the NO3−-anions (▵=ν4−ν1) and position of the band of ν(Eu–O) vibration show that the strongest Eu–O bonds are formed in Eu(NO3)3.Nphen2, Eu(NO3)3.Tmphen2 and Eu(NO3)3.Dphphen2 due to high acceptor properties of nitro-phenanthroline and large size of tetramethyl- and diphenyl-phenanthroline molecules. Weak vibronic mixing of electronic and vibronic states was demonstrated in the region of 5D0–7F2 transition of Eu3+. The vibronic satellites of 5D0–7F0 -transition due to vibrations of the NO3−-group borrow about 1–2% of the intensity of the electric-dipole 5D0–7F2 transition yielding the increase of their relative intensity of 100 times in the Stokes sideband." @default.
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• W2039129472 date "2000-04-01" @default.
• W2039129472 modified "2023-09-23" @default.
• W2039129472 title "Vibronic spectra and details of the structure of europium nitrates with derivatives of 1,10-phenanthroline" @default.
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• W2039129472 doi "https://doi.org/10.1016/s0925-8388(99)00720-3" @default.
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