Luminescence of five-coordinated nickel(II) complexes with substituted-8-hydroxyquinolines and macrocyclic ligands

  1. Santana, M.D. 1
  2. García-Bueno, Rocío. 1
  3. García, Gabriel. 1
  4. Pérez, J. 2
  5. García, L. 2
  6. Monge, M. 3
  7. Laguna, A. 4
  1. 1 Universidad de Murcia
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    Universidad de Murcia

    Murcia, España

    ROR https://ror.org/03p3aeb86

  2. 2 Universidad Politécnica de Cartagena
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    Universidad Politécnica de Cartagena

    Cartagena, España

    ROR https://ror.org/02k5kx966

  3. 3 Universidad de La Rioja
    info

    Universidad de La Rioja

    Logroño, España

    ROR https://ror.org/0553yr311

  4. 4 Universidad de Zaragoza
    info

    Universidad de Zaragoza

    Zaragoza, España

    ROR https://ror.org/012a91z28

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Revista:
Dalton Transactions

ISSN: 1477-9226

Año de publicación: 2010

Volumen: 39

Número: 7

Páginas: 1797-1806

Tipo: Artículo

DOI: 10.1039/B917994A SCOPUS: 2-s2.0-75749132775 WoS: WOS:000274207100024 GOOGLE SCHOLAR

Otras publicaciones en: Dalton Transactions

Resumen

A series of heteroleptic quinolinolate pentacoordinated nickel(ii) complexes, [Ni(mcN 3)(R 1,R 2,R 3-8-hq)](PF 6), were synthesized and characterized by spectroscopic methods. Single-crystal X-ray diffraction studies for [(Me 3-mcN 3)Ni(N,O-2-CN-8-hq)][PF 6] (6a), [(Me 4-mcN 3)Ni(N,O-8-hq)][PF 6] (2b) and [(Me 4-mcN 3)Ni(N,O-5,7-I 2-8-hq)][PF 6] (5b) indicate that these complexes consist of a square-pyramidal ligand arrangement containing one chelating quinolinolate and one macrocyclic ligand (mcN 3). Variation of the substituents on quinolinolate ligands imposes obvious electronic or structural effects on the nickel atom. These chromophores absorb moderately in the visible region and emit in the yellowish-green spectral region from a quinolinolate-centered intraligand charge-transfer excited state. The emission maxima are in the range 520-548 nm, with quantum yields between 0.11 and 1.63%, in deoxygenated organic solvents at room temperature. TD-DFT calculations allow exploration of the photophysical properties of complex [(Me 4-mcN 3)Ni(N,O-8-hq)][PF 6] 2b and reveal the influence of the quinolinolate ligand on the HOMO/LUMO energies and oscillator strengths. © The Royal Society of Chemistry 2010.