Publication: Synthesis, thermal and optical properties of a novel bis(2-(4-dicyanovinylphenyl) pyridinato-N, C2) iridium(acetylacetonate)
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Authors
Altınölçek, Nuray
Tavaslı, Mustafa
Authors
Aydemir, Murat
Abay, Bahattin
Monkman, Andrew P.
Advisor
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Elsevier
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Abstract
Bis(2-(4-formylphenyl) pyridinato-N, C2) iridium(acetylacetonate) (5) was subjected to a Knoevenagel reaction with malononitrile in dichloromethane in the presence of catalytic amount of pyrrolidine. This gave successfully a novel bis(2-(4-dicyanovinylphenyl) pyridinato-N, C2) iridium(acetylacetonate) (6) in good yield (83%). Complex 6 was fully chracterised by H-1, C-13 NMR, FT-IR, elemental analysis. Complex 6 showed a strong ligand centred (LC) absorption band at 355 nm (epsilon 56490 L mol (1) cm (1)) and weak metal-to-ligand charge transfer (MLCT) bands at 445 (epsilon 4154 L mol (1) cm (1)) and 535 nm (epsilon 2606 L mol (1) cm (1)). Complex 6 loses its acac moiety between 248 and 336 Alpha degrees C (under N-2 atmosphere) and emits a red light at 695 nm with a large Stokes shift (160 nm).
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Keywords
Chemistry, Heteroleptic iridium(III) complex, Knoevenagel reaction, Dicyanovinyl group, Thermal stability, Absorption emission, Cyclometalated iridium complexes, 2-phenylpyridine, Light-emitting-diodes, Ir(III) complexes, Emission color, Blue, Ligands, Phosphorescence, Photophysics, Red, Absorption, Charge transfer, Complexation, Dichloromethane, Ligands, Neutron emission, Optical properties, Thermodynamic stability, Acetylacetonates, Catalytic amounts, Iridium complex, Knoevenagel reaction, Malononitriles, Metal to ligand charge transfers, N2 atmospheres, Iridium compounds
Citation
Altınölçek, N. vd. (2016). "Synthesis, thermal and optical properties of a novel bis(2-(4-dicyanovinylphenyl) pyridinato-N, C2) iridium(acetylacetonate)". Inorganica Chimica Acta, 440, 102-106.