Three novel coordination compounds based on 2,4,6-tris(1H-pyrazolyl)-l,3,5-triazine ligand (PzTz), namely [Ln(PzTz)(NO3)3(H2O)] (Ln = Eu, Gd, Tb) were synthesized and spectroscopically and structurally characterized. X-ray diffraction experiments revealed the monomeric nature of the complexes exhibiting either “sphenocorona” or bicapped square antiprism distorted coordination geometry, the lanthanide ions being ten-coordinated. The relatively high energy of triplet state of the ligand (T1 = 23,000 cm−1) has been demonstrated to be favorable for sensitization of Tb3+ ion and this has been proved by luminescence decay measurements as well as by experimental determination of photoluminescence quantum yield (Φ = 34%).
Luminescent complexes of Eu3+,Tb3+ and Gd3+ nitrates with polytopic ligand 2,4,6-tris(1H-pyrazol-1-yl)-1,3,5-triazine
Pettinari C.
Penultimo
;
2020-01-01
Abstract
Three novel coordination compounds based on 2,4,6-tris(1H-pyrazolyl)-l,3,5-triazine ligand (PzTz), namely [Ln(PzTz)(NO3)3(H2O)] (Ln = Eu, Gd, Tb) were synthesized and spectroscopically and structurally characterized. X-ray diffraction experiments revealed the monomeric nature of the complexes exhibiting either “sphenocorona” or bicapped square antiprism distorted coordination geometry, the lanthanide ions being ten-coordinated. The relatively high energy of triplet state of the ligand (T1 = 23,000 cm−1) has been demonstrated to be favorable for sensitization of Tb3+ ion and this has been proved by luminescence decay measurements as well as by experimental determination of photoluminescence quantum yield (Φ = 34%).File | Dimensione | Formato | |
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Inorganica Chimica Acta 510 (2020) art. 119764.pdf
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