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- Title
Luminescent Benzoquinolate-Isocyanide Platinum(II) Complexes: Effect of Pt⋅⋅⋅Pt and π⋅⋅⋅π Interactions on their Photophysical Properties.
- Authors
Forniés, Juan; Sicilia, Violeta; Borja, Pilar; Casas, José M.; Díez, Alvaro; Lalinde, Elena; Larraz, Carmen; Martín, Antonio; Moreno, M. Teresa
- Abstract
The neutral compounds [Pt(bzq)(CN)(CNR)] (R= tBu ( 1), Xyl ( 2), 2-Np ( 3); bzq= benzoquinolate, Xyl=2,6-dimethylphenyl, 2-Np=2-napthyl) were isolated as the pure isomers with a trans-Cbzq,CNR configuration, as confirmed by 13C{1H} NMR spectroscopy in the isotopically marked [Pt(bzq)(13CN)(CNR)] (R= tBu ( 1′), Xyl ( 2′), 2-Np ( 3′)) derivatives ( δ13CCN≈110 ppm; 1 J(Pt,13C)≈1425 Hz]. By contrast, complex [Pt(bzq)(C≡CPh)(CNXyl)] ( 4) with a trans-Nbzq,CNR configuration, has been selectively isolated from [Pt(bzq)Cl(CNXyl)] ( trans-Nbzq,CNR) using Sonogashira conditions. X-ray diffraction studies reveal that while 1 adopts a columnar-stacked chain structure with Pt-Pt distances of 3.371(1) Å and significant π⋅⋅⋅π interactions (3.262 Å), complex 2 forms dimers supported only by short Pt⋅⋅⋅Pt (3.370(1) Å) interactions. In complex 4 the packing is directed by weak bzq⋅⋅⋅Xyl and bzq⋅⋅⋅C≡E (C, N) interactions. In solid state at room temperature, compounds 1 and 2 both show a bright red emission ( ϕ=42.1 % 1, 57.6 % 2). Luminescence properties in the solid state at 77 K and concentration-dependent emission studies in CH2Cl2 at 298 K and at 77 K are also reported for 1- 4.
- Publication
Chemistry - An Asian Journal, 2012, Vol 7, Issue 12, p2813
- ISSN
1861-4728
- Publication type
Article
- DOI
10.1002/asia.201200585