Synthesis, crystalline structures and photophysical properties of new cadmium iodide complexes with thiocarbamoyl-pyrazoline ligands

This work describes the synthesis, structural characterization and photophysical properties of new luminescent CdII complexes based on thiocarbamoyl-pyrazoline ligands. [Display omitted] •Synthesis of new luminescent CdII materials based on thiocarbamoyl-pirazoline ligands.•X-ray structures of tetra...

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Published in:Inorganica Chimica Acta 2018-11, Vol.483, p.293-298
Main Authors: Rosa, Persiely P., Laranjeira, Guilherme B., Favarin, Lis R.V., Pizzuti, Lucas, Júnior, Amilcar M., Pinto, L.M.C., Gatto, Claudia C., Caires, Anderson R.L., Oliveira, Carolina G., Deflon, Victor M., Casagrande, Gleison Antônio
Format: Article
Language:English
Subjects:
Cadmium
Cadmium (II) complexes
Cadmium luminescent materials
Coordination compounds
Emission analysis
Fluorescence
Infrared spectroscopy
Ligands
Luminescence
Molecular absorption
NMR
Nuclear magnetic resonance
Thiocarbamoyl-pyrazoline
X ray spectra
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Summary:This work describes the synthesis, structural characterization and photophysical properties of new luminescent CdII complexes based on thiocarbamoyl-pyrazoline ligands. [Display omitted] •Synthesis of new luminescent CdII materials based on thiocarbamoyl-pirazoline ligands.•X-ray structures of tetrahedral coordination compounds based on CdII.•Photophysical Properties and bluish emission from LLCT electronic transitions.•Luminescent materials based on closed shell d10 systems presenting nanosecond fluorescence lifetime. New mononuclear cadmium (II) complexes based on thiocarbamoyl-pyrazoline ligands were synthesized and structurally characterized. Complexes 1, 2 and 3 possess similar structural behavior around the cadmium (II) atom which presented a distorted tetrahedral coordination geometry determined by using the τ4 (tau four) parameter analysis. Interesting photophysical properties as bluish emission at spectral range (330–450 nm) and nanoseconds fluorescence lifetime (1.05 up to 1.42 ns) were observed upon excitation of the prepared compounds at λex = 300 nm. This emission was tentatively assigned to the LLCT transitions of the type XLCT I(5p6) → π∗(conjugated pyrazoline system) according to the frontier orbital molecular calculations. The complete characterization of the prepared compounds also included X-ray structure determination, elemental analyses, IR spectroscopy, 1H and 13C NMR experiments, molecular absorption (UV–Vis) and luminescence studies.
ISSN:0020-1693
1873-3255
DOI:10.1016/j.ica.2018.08.038