Schiff Bases

Report
Novel multifunctional N,O,S - donor ligands for
d- and f-element complexation
22.02.2012
Juliane März
1 Introduction
TU Dresden
Department of
Chemistry and Food
Chemistry
1 Introduction
„Basic research in energy 2020+ and in nuclear safety and disposal“
Joint research project:
„Novel multifunctional N,O,S - donor ligands for d- and f-element complexation“
University of Leipzig
TU Dresden
HZDR
02NUK014A
Coordination Chemistry of d- and f-block elements
1 Introduction
Porphyrines
β-Diketones/
Hydrazones
Schiff bases
Members of our group
and their fields of research
Amides
Schiff bases
1 Introduction
Ligand systems
β-Diketones
Hydrazones
Schiff bases
Amines
Synthesis and characterisation
Characteristics of complexation
- Spectroscopy: ESI-MS, NMR, IR, UV/Vis, Fluorescence
- X-ray analysis
- Potentiometry
- Liquid-liquid extraction
Diamides
2 Results
β-Diketones
Coordination of Eu(III): [Eu(L)3(H2O)2]·THF
Complex Synthesis:
- THF
- Deprotonation agent Na2CO3
O2 donor set
CN = 8
2 Results
Hydazones
Coordination of UO22+: (Et3NH)2[(UO2)2(μ-O2)(L)2]MeOH
Complex Synthesis:
- MeOH
- Deprotonation agent Et3N
N2O2 donor set
CN = 8
2 Results
Schiff Bases
Coordination of UO22+: [UO2(L)]
Microwave synthesis
of the complex
N9
U1
O16
O10
N2O3 donor set
CN = 7
2 Results
Amides
N,N‘,N‘‘-Tris(2-picolyl)methane tricarboxamide
X-ray analysis
Left-handed triple N‒H…O hydrogen bond helix
2 Results
UV/Vis Spectroscopy: Fe(III)
Fe(NO3)3·6H2O, ctotal = 2.5·10-4 M in MeOH
Job Plot at 660 nm:
2:1 ratio (L:Fe3+)
2 Results
UV/Vis Spectroscopy : La(III)
La(NO3)3·6H2O
Preparation of the samples:
10-2 M in THF
1 h heating
ctotal = 4·10-3 M in MeOH
2 Results
Luminescence of Ln(III)- complexes in THF, H2O and EtOH/H2O
Syntheses:
ctotal = 10-2 M, in THF
Microwave: 90 min (max. 200W)
30 min cooling
Gd(III)-complex of L1
Excitation at 366 nm
MW
+H2O
2 Results
Absorbance and Fluorescence Spectroscopy
2 Results
Fluorescence Spectroscopy
Cooperation with HZDR
Further analysis:
- Dependence on pH
- Other ligand systems
- Other metal complexes
3 Outlook
Further Fluorescence studies
 Cooperation with HZDR
Potentiometry
pH
Liquid-liquid
extraction
Metal complexes
Current work:
Cu(II)/Eu(III)
Planned works:
Nd/Tb/Yb(III)
U(VI),
Cm/Am(III)
Further
projects
Supramolecular
Gelation
Metallogels with
Schiff bases and
Amides
1H-NMR-titrations
with…
Zn2+, Y3+, La3+,
UO22+
in organic solvents
Thank you for your attention.

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