Synthesis and Characterisation of 4-Acyl-3-methyl-2-pyrazolin-5-one Complexes of Aluminium

Singh, Yash Pal; K., A.

doi:10.1080/00945718208057477

Cited by 5 publications

(1 citation statement)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is worth noting that the Al 3+ , Ga 3+ , and In 3+ complexes containing acylpyrazolonates have been scarcely studied to date [26]. Several aluminum complexes have been previously obtained from the interaction of Al(i-PrO) 3 or anhydrous AlCl 3 with three different 4-acylpyrazolones-5, bearing 4-acetyl, 4-benzyl, or 4-propionyl fragments in benzene [45]. Analogous In 3+ complexes were prepared using In(i-PrO) 3 as the starting material with a method also employed for the preparation of Al 3+ ion complexes [46].…”

Section: Synthesis Of Complexesmentioning

confidence: 99%

Dynamics of the Ligand Excited States Relaxation in Novel β-Diketonates of Non-Luminescent Trivalent Metal Ions

Polikovskiy

Korshunov

Gontcharenko

et al. 2023

IJMS

View full text Add to dashboard Cite

Complexes emitting in the blue spectral region are attractive materials for developing white-colored light sources. Here, we report the luminescence properties of novel coordination compounds based on the trivalent group 3, 13 metals, and the 1-phenyl-3-methyl-4-cyclohexylcarbonyl-pyrazol-5-onate (QCH) ligand. [M(QCH)3] (M = Al, Ga, and In), [M(QCH)3(H2O)] (M = Sc, Gd, and Lu), [Lu(QCH)3(DMSO)], and [La(QCH)3(H2O)(EtOH)] complexes were synthesized and structurally characterized by a single-crystal X-ray diffraction study. It has been found that the luminescence quantum yields of the ligand increase by one order of magnitude upon metal coordination. A significant correspondence between the energies of the ligand’s excited states and the luminescence quantum yields to the metal ion’s atomic numbers was found using molecular spectroscopy techniques. The replacement of the central ion with the heavier one leads to a monotonic increase in singlet state energy, while the energy of the triplet state is similar for all the complexes. Time-resolved measurements allowed us to estimate the intersystem crossing (ISC) rate constants. It was shown that replacing the Al3+ ion with the heavier diamagnetic Ga3+ and In3+ ions decreased the ISC rate, while the replacement with the paramagnetic Gd3+ ion increased the ISC rate, which resulted in a remarkably bright and room-temperature phosphorescence of [Gd(QCH)3(H2O)].

show abstract

Section: Synthesis Of Complexesmentioning

confidence: 99%