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

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Dalton Transactions Vol - 39 Issue - 6

Dalton Transactions Vol - 39 Issue - 5

Dalton Transactions Vol -0

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

Content Provider	Royal Society of Chemistry (RSC)
Author	García, Luis García, Gabriel Laguna, Antonio Monge, Miguel Santana, M. Dolores García-Bueno, Rocío Pérez, José
Copyright Year	2010
Abstract	A series of heteroleptic quinolinolate pentacoordinated nickel(II) complexes, [Ni(mcN3)(R1,R2,R3-8-hq)](PF6), were synthesized and characterized by spectroscopic methods. Single-crystal X-ray diffraction studies for [(Me3-mcN3)Ni(N,O-2-CN-8-hq)][PF6] (6a), [(Me4-mcN3)Ni(N,O-8-hq)][PF6] (2b) and [(Me4-mcN3)Ni(N,O-5,7-I2-8-hq)][PF6] (5b) indicate that these complexes consist of a square-pyramidal ligand arrangement containing one chelating quinolinolate and one macrocyclic ligand (mcN3). 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 [(Me4-mcN3)Ni(N,O-8-hq)][PF6] 2b and reveal the influence of the quinolinolate ligand on the HOMO/LUMO energies and oscillator strengths.
Starting Page	1797
Ending Page	1806
Page Count	10
File Format	HTM / HTML PDF
ISSN	14779226
Volume Number	39
Issue Number	7
Journal	Dalton Transactions
DOI	10.1039/b917994a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Nickel X-ray crystallography Douglas O-2 Ligand Quantum
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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