Synthesis and characterization of luminescent zinc(II) complexes with a N, N-bidentate 1-pyridylimidazo[1, 5-a]pyridine ligand. (18th April 2015)

• Record Type: Journal Article
• Authors: Ardizzoia, G. Attilio; Brenna, Stefano; Durini, Sara; Therrien, Bruno
• Is Part Of: Polyhedron. Volume 90(2015)
• Page Start: 214
• Page End: 220
• Publication Date: 2015-04-18
• Subjects: Zinc(II) -- Crystal structure -- N ligands -- Pyridylimidazo[1, 5-a]pyridine -- Photoluminescence; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2015.02.005
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: Zinc(II) complexes with the N, N -bidentate 2-(1-(pyridin-2-yl)imidazo[1, 5- a ]pyridin-3-yl)phenol ligand (L ) and different polyatomic anions (ClO4 −, BF4 −, PF6 −, NO3 − ) have been synthesized and spectroscopically characterized. In the solid state, these compounds show intense luminescence with λ max of emission in the blue-green range and moderate absolute photoluminescence quantum yields. Abstract: Ligand 2-(1-(pyridin-2-yl)imidazo[1, 5- a ]pyridin-3-yl)phenol (L ) has been reacted in a 2:1 molar ratio with different Zn(Y)2 n H2 O salts, where Y represents a polyatomic anion (Y = ClO4 −, NO3 −, BF4 −, PF6 − ). The X-ray structural analysis performed on two of the derivatives obtained, namely [Zn(L )2 (ClO4 )](ClO4 )·H2 O (1 ) and [Zn(L )2 (CH3 CN)2 ](BF4 )2 (6 ), proves that as expected ligandL binds in a N, N -bidentate mode via the pyridine ring (Npy ) and the pyridine-like nitrogen of the imidazo[1, 5- a ]pyridine skeleton (Nim ). A spectroscopic investigation (including infrared, elemental analysis, 1 H and 31 P NMR, thermogravimetric analysis) has been performed on these species, allowing complete characterizations. A preliminary survey on their photophysical properties in the solid state was carried out: the complexes showing intense luminescence when excited with UV light ( λ exc = 421–469 nm) with λ max of emission in the blue-green range (468–500 nm) and moderate absolute photoluminescence quantum yields (PLQYs).