X-ray Crystal Structure of Gallium Tris- (8-hydroxyquinoline):  Intermolecular π−π Stacking Interactions in the Solid State

Abstract

Efficient electroluminescence (EL) from an organic light-emitting device (OLED) was first reported by Tang and Van Slyke using tris(8-hydroxyquinoline)aluminum (Alq 3 ). 1 Since this report, the interest in Alq 3 and other metal-chelate systems to produce EL in different spectral regions for display applications has considerably increased. [2][3][4][5] Although Alq 3 and Gaq 3 have low fluorescence quantum yield, they have excellent properties as EL materials, namely, good charge transport, highly stable film formation, and good heat resistance. Forrest and co-workers have shown that Gaq 3 has a thin film PL quantum efficiency of only 25% of that for Alq 3 .

Synthesis, crystal structures and properties of five-coordinate Schiff-base Zn(II) complexes

“…They are clearly within the sum of the van der Waals radii for hydrogen (1.2 Å ) and oxygen (1.5 Å ) [33]. There are weak C-HÁ Á ÁO hydrogen bonding interactions between adjacent molecules [32,34].…”

“…The intermolecular -interaction distance is 3.3 Å . The intermolecular -interactions suggest that chsa-Zn-pyridine can possess charge transport properties like Gaq 3 [32], which is essential for an electroluminescent material. The other very interesting feature of the crystal structure of 1 is that every two molecules of the complex are situated inversely in the solid state, as shown in figure 1(b).…”

Interaction of the anticancer gallium(III) complexes of 8-hydroxyquinoline and maltol with human serum proteins

“…The 3D structure of KP46 was retrieved from the Cambridge Structural Database [40,41]. Geometry optimization was performed by means of quantum mechanical calculations based on density functional theory methods included in Gaussian 09 [42].…”

The correlation between magnetism and structures for new solvent free iron(III) and chromium(III) homoleptic 8-quinolinato complexes

“…Since 1987 [2], Alq 3 has been the most extensively used light-emitting electron-transport material in organic light-emitting diodes (OLEDs), but the crystal structures of pure Alq 3 were not determined until by Brinkmann et al [3] in 2000. Until now, only eight unsolvated Mq 3 complexes have been reported including a-, b-, c-, d-, e-Alq 3 [1][2][3][4][5][6], Gaq 3 [7], Sbq 3 [8], and Inq 3 [9,10]. Table 1 lists the previously reported crystal cell unit parameters of the five phases for Alq 3 .…”