IngentaConnect Synthesis and photophysical properties of naphthyl-, phenanthryl-...

Abstract:

A family made of four bis(pyridyl)triazine ligands with appended aryl rings, including three fused aromatic rings, have been synthesized, and their corresponding homoleptic Ru(II) and Zn(II) complexes have been prepared and characterized by several means. The free ligands 2,4-di(2-pyridyl)-6-phenyl-1,3,5-triazine (L1); 2,4-di(2-pyridyl)-6-(1-naphthyl)-1,3,5-triazine (L2); 2,4-di(2-pyridyl)-6-(9-phenanthryl)-1,3,5-triazine (L3); and 2,4-di(2-pyridyl)-6-(1-pyrenyl)-1,3,5-triazine (L4) were formed in triazine ring-forming reactions from the reactions of the cyano-functionalized aromatic rings with LiNMe₂ followed by the addition of 2 equiv. of 2-cyanopyridine. The metal complexes examined in this study are the homoleptic Ru(II) complexes Ru(L1)₂²⁺ (2a), Ru(L2)₂²⁺ (2b), Ru(L3)₂²⁺ (2c), and Ru(L4)₂²⁺ (2d) and Zn(II) complexes Zn(L1)₂²⁺ (3a), Zn(L2)₂²⁺ (3b), Zn(L3)₂²⁺ (3c), and Zn(L4)₂²⁺ (3d). Also, crystallographic data for the free ligands and Zn(II) and Ru(II) complexes have been obtained in some cases. The redox behaviour and absorption spectra of all the species have been investigated, together with the luminescence properties of the free ligands at room temperature in fluid solution and of the Ru(II) complexes both at room temperature in fluid solution and at 77 K in rigid matrix. The redox data indicate that the free ligands are reduced twice at relatively mild potentials (< -2.30 V vs. SCE), with the first reduction almost independent of the nature of the substituted aryl group. The UV absorption spectra of all the compounds are dominated by intense spin-allowed π-π* transitions mainly centered on the bis(pyridyl)triazine moiety; however, in L2-L4, moderately intense intraligand charge-transfer (ILCT) bands are also present. Such bands are red-shifted in the Zn(II) compounds, while they are obscured in the Ru(II) species by the more intense spin-allowed metal-to-ligand charge-transfer (MLCT) bands. The free ligands exhibit interesting emission properties, ranging from fluorescence from π-π* states to excimeric (in L4) and ILCT (in L2 and L3) emission. In the Ru(II) complexes, strong emission is found at 77 K from triplet MLCT states. For 2c and 2d, the emissive MLCT states are mixed with low-lying triplet ligand-centered states.Key words: triazine ligands, ruthenium complexes, zinc complexes, ILCT emission.

On a effectué la synthèse d'une famille formée de quatre ligands bis(pyridyl)triazine portant des noyaux aromatiques, y compris trois noyaux aromatiques dont on a préparé et caractérisé les complexes homoleptiques correspondants du Ru(II) et du Zn(II). Les ligands libres 2,4-di(2-pyridyl)-6-phényl-1,3,5-triazine (L1), 2,4-di(2-pyridyl)-6-(1-naphtyl)-1,3,5-triazine (L2), 2,4-di(2-pyridyl)-6-(9-phénanthryl)-1,3,5-triazine (L3) et 2,4-di(2-pyridyl)-6-(1-pyrényl)-1,3,5-triazine (L4) ont été obtenus par des réactions conduisant à des triazines et impliquant l'action du LiNMe₂ sur des cyano portés par noyaux aromatiques fonctionnalisés, suivie par l'addition de deux équivalents de 2-cyanopyridine. Les complexes métalliques examinés dans cette étude sont les complexes homoleptiques du Ru(II), Ru(L1)₂²⁺ (2a), Ru(L2)₂²⁺ (2b), Ru(L3)₂²⁺ (2c) et Ru(L4)₂²⁺ (2d) et du Zn(II), Zn(L1)₂²⁺ (3a), Zn(L2)₂²⁺ (3b), Zn(L3)₂²⁺ (3c) et Zn(L4)₂²⁺ (3d). Dans certains cas, on a aussi obtenu des données cristallographiques pour les ligands libres et des complexes du Zn(II) et du Ru(II). On a étudié le comportement redox et les spectres d'absorption de toutes les espèces, de même que les propriétés de luminescence des ligands libres, à la température ambiante et en solution fluide ainsi que celles des complexes du Ru(II) tant à la température ambiante, en solution fluide, que celles à 77 K, dans une matrice solide.

Synthesis and photophysical properties of naphthyl-, phenanthryl-, and pyrenyl-appended bis(pyridyl)triazine ligands and their Zn(II) and Ru(II) complexes1

Synthesis and photophysical properties of naphthyl-, phenanthryl-, and pyrenyl-appended bis(pyridyl)triazine ligands and their Zn(II) and Ru(II) complexes¹