Abstract
The title mol-ecule, C38H42N4O4, displays a helical structure induced by the combination of the C-C-C-C torsion angle [-10.8 (2)°] between two 2,3'-bipyridyl units attached to the 1,2-positions of the central benzene ring and consecutive connections between five aromatic rings through the meta- and ortho-positions. Intra-molecular C-H⋯π inter-actions between an H atom of a pyridine ring and the centroid of a another pyridine ring contributes to the stabilization of the helical structure. In the crystal, weak C-H⋯π inter-actions link the title mol-ecules into a two-dimensional supra-molecular network extending parallel to the ac plane, in which the mol-ecules with right- and left-handed helical structures are alternately arranged. Hirshfeld surface analysis and two-dimensional fingerprint plots indicate that the mol-ecular packing is dominated by van der Waals inter-actions between neighbouring H atoms, as well as by C-H⋯π inter-actions. One isopropoxyl group is disordered over two sets of sites [occupancy ratio 0.715 (5):0.285 (5)].
Highlights
The title molecule, C38H42N4O4, displays a helical structure induced by the combination of the C—C—C—C torsion angle [À10.8 (2)] between two 2,30bipyridyl units attached to the 1,2-positions of the central benzene ring and consecutive connections between five aromatic rings through the meta- and ortho-positions
Intramolecular C—HÁ Á Á interactions between an H atom of a pyridine ring and the centroid of a another pyridine ring contributes to the stabilization of the helical structure
Hirshfeld surface analysis and two-dimensional fingerprint plots indicate that the molecular packing is dominated by van der Waals interactions between neighbouring H atoms, as well as by C—HÁ Á Á interactions
Summary
Phosphorescent transition metal complexes based on platinum metal cations have attracted enormous current interest owing to their applications as electroluminescent devices, e.g. as phosphorescent organic light-emitting diodes (PhOLEDs) or light-emitting electrochemical cells (LEECs) (Cebrian & Mauro, 2018). Platinum complexes bearing tetradentate ligands are of great interest as blue phosphorescent materials because of their pure blue emission and high efficiency (Fleetham et al, 2014). Our interest has been focused on the development of a suitable tetradentate ligand based on 2,30-bipyridine with a large triplet energy (Lee et al, 2017). The crystal structures of 2,30-bipyridine-based tetradentate ligands have aroused our curiosity, because the knowledge of the coordination mode(s) to a metal ion are of paramount importance in understanding its chemical and physical properties. Symmetry codes: (i) x þ 12; Ày þ 32; z þ 12; (ii) x þ 1; y; z
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