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Title
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Synthesis, spectroscopic properties, crystal structure and Hirshfeld surface
analysis of Pr(III), Sm(III), Gd(III), Dy(III), and Ho(III) coordination
compounds with Schiff base ligand derived from 4-aminoantipyrine
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Keywords
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Lanthanide coordination compounds, Crystal structure, Hirshfeld surface analysis, Spectroscopic methods, Emission spectrum
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Abstract
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Under reflux condition five new lanthanide coordination compounds, [Pr(L)2(NO3)3(CH3OH)] (1), [Sm
(L)2(NO3)3(CH3OH)] (2), [Gd(L)2(NO3)3(CH3OH)] (3), [Dy(L)2(NO3)3(CH3OH)] (4) and [Ho
(L)2(NO3)3(CH3OH)] (5), were synthesized in methanol where L is the Schiff base ligand prepared from the
reaction of 4-aminoantipyrine and 5-bromosalicylaldehyde. Elemental analysis, FT-IR, UV/Vis and photoluminescence
spectroscopic methods and single crystal X-ray analysis were used to investigate the crystal
structure and properties of the synthesized compounds. Using X-ray analysis, it was found that all crystals are
isomorphous and the Ln ion (Ln = Pr, Sm, Gd, Dy and Ho) in all of the synthesized compounds is ninecoordinated
and the geometry around them is slightly distorted tricapped trigonal prism. Six oxygen atoms
are coordinated to the central lanthanide atom by three nitrate groups, one oxygen atom from the methanol
group and two oxygen atoms of the Schiff base ligand (L) which create the LnO9 coordination environment.
Intermolecular interactions and the distribution of these interactions in all of these crystals were calculated by
Hirshfeld surface analysis using Crystal Explorer 17.5 software. The emission spectrum of these compounds was
recorded and the obtained results showed that the intensity of peaks has differences and the emission spectrum of
the complexes changes by changing the lanthanide ions.
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