Synthesis, thermal and optical properties of a novel bis(2-(4-dicyanovinylphenyl) pyridinato-N, C2) iridium(acetylacetonate)


Altinolcek N. , TAVASLI M. , Aydemir M., Abay B., Monkman A. P.

INORGANICA CHIMICA ACTA, vol.440, pp.102-106, 2016 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 440
  • Publication Date: 2016
  • Doi Number: 10.1016/j.ica.2015.10.028
  • Title of Journal : INORGANICA CHIMICA ACTA
  • Page Numbers: pp.102-106
  • Keywords: Heteroleptic iridium(III) complex, Knoevenagel reaction, Dicyanovinyl group, Thermal stability, Absorption Emission, CYCLOMETALATED IRIDIUM COMPLEXES, LIGHT-EMITTING-DIODES, IR(III) COMPLEXES, EMISSION COLOR, BLUE, LIGANDS, PHOSPHORESCENCE, PHOTOPHYSICS, RED, 2-PHENYLPYRIDINE

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). (C) 2015 Elsevier B.V. All rights reserved.