New electroluminescent materials based on chelate zinc complexes

Abstract

Three new chelate zinc complexes with azomethine groups characterized by luminescence in the visible spectral region were synthesized: bis(N (2 oxybenzylidene)cyclohexylamine)zinc, bis(N (2 oxybenzylidene) 4 tert butylaniline)zinc, and N,N´ bis(oxybenzylidene) 1,2 phe nylenediaminezinc. Their spectral properties were studied. Based on these complexes, we prepared electroluminescence devices giving an intense emission in the blue, green, and red spectral regions.

Metal Complexes of π-expanded Ligand (5): Synthesis, Structural, and Photophysical Characterizations of Green-Red Luminescent Pyrene-based Salicylaldiminato-type Zinc Complexes

“…It should be mentioned that the new complexes 1(Zn), 1b(Zn) and 1c(Zn) are stable and have high melting point under ambient condition but they may be decomposed easily when they contact with an acid or being kept for a long time in solution. This phenomenon is also found similar to the simple salicylaldiminato zinc(II) complexes [8,9,22,23]. All obtained complexes were subjected to analysis by mass spectrometry (MS).…”

“…In recent years, zinc complexes containing chelating N,O-, N,N-chromophores have become the focus of intense research [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. These complexes contain chromophores that emit visible light at wavelengths depending on the composition and structure of the material, thereby the colour of emission.…”

Photoluminescence of Zinc Complexes: Easily Tunable Optical Properties by Variation of the Bridge Between the Imido Groups of Schiff Base Ligands

“…With fully conjugated spacers, the quasisimilar absorption spectra obtained with C 21 , C 25 , and C 29 denote the weak influence of the substitution pattern (presence or not of electron-donating groups) of the benzene ring. Thus, significantly redshifted emission was obtained for metal chelates prepared with o-vanillin compared with those of the parent com-plexes prepared with salicylaldehyde (482 and 481 nm for C 3 and C 19 vs. 447 and 441 nm for C 1 and C 17 , respectively). Finally, the use of maleonitrile as the conjugated spacer enables the generation of a family of complexes that strongly absorb in the visible region, and the absorption maximum for the MLCT band is located at 560 nm for C 33 (see Figure 3).…”

“…Although examples of blue-emitting complexes with iridium as the metal cation are extremely rare, [17] blue-emitting zinc complexes are less difficult to obtain, and a wide range of complexes has been developed over the years. [19] Herein, we report a series of forty complexes that display photoluminescence ranging from deep blue to red. Among the conjugated spacers, aromatic derivatives (to generate salphen ligands, salphen = N,NЈ-disalicylideneo-phenylenediamine) or maleonitrile-type salen Schiff base ligands have been notably investigated.…”

Chirality and diastereoselection in the μ-oxo diiron complexes L2Fe–O–FeL2 (L = bidentate salicylaldiminato)

“…13 C{ 1 H} NMR (100 MHz, CDCl 3 ): d 161.0 (Ar-C q ), 160.3 (CH=N), 158.3, 141.3 (Ar-C q ), 132.7, 131.9, 122.3 (Ar-CH), 119.4 (Ar-C q ), 119.0, 117. 54 . Following the general procedure with the addition of molecular sieves (4 A ˚) and a dinitrogen atmosphere, salicylaldehyde (1.00 g, 8.18 mmol), p-tert-butylaniline (1.22 g, 8.18 mmol) and methanol (50 cm 3 ) were used.…”