Dibenzoeilatin: a novel ligand exhibiting remarkable complementary π–π stacking interactions

Abstract

The complex [Ru(bpy)2(dbneil)][PF6]2 forms discrete dimers in solution held by strong pi-pi stacking interactions via its distorted dibenzoeilatin ligand, indicating that planarity is not an obligatory requirement for achieving strong pi-stacking, as long as complementarity between the stacking moieties can be achieved.

Mono‐ and Dinuclear Ruthenium(II)–1,6,7,12‐Tetraazaperylene Complexes of N,N′‐Dimethyl‐2,11‐diaza[3.3](2,6)‐pyridinophane

“…The dape complex [1] 2+ displays a single reversible oxidation at 1.18 V vs. SCE, which is attributed to a ruthenium-centered electron transfer (Ru II/III redox potential). However, in contrast to [4] 4+ , in which the terminal ligands are bipyridine molecules, [3] 4+ shows a larger difference between the redox potentials of the two consecutive oxidation processes. Two successive reversible one-electron oxidation steps are observed for dinuclear complex [3] 4+ , which is consistent with the electrochemical properties of the previously reported related complex [{Ru(bpy) 2 } 2 (μ-tape)] 4+ [2] ([4] 4+ ).…”

“…They have a distinctive ability to form strong π-π stacking interactions; because of this, they have often been called "large surface" ligands. [4][5][6] Dinuclear species [{Ru(bpy) 2 } 2 (μ-dbneil)] 4+ was separated into its three stereoisomeric forms and then 4632 1.28 V vs. SCE. [4][5][6] Dinuclear species [{Ru(bpy) 2 } 2 (μ-dbneil)] 4+ was separated into its three stereoisomeric forms and then 4632 1.28 V vs. SCE.…”

Supramolecular activation of a molecular photocatalyst

“…7 The planar ligand structure has previously been utilized for detailed dimerization studies of the related mononuclear ruthenium complex [Ru(bpy) 2 (tpphz)](PF 6 ) 2 in solution. [29][30][31][32][33] More recently the DNA intercalation of tpphz-based Ru complexes has been utilized to access reversible luminescent switches.…”

A spectroscopic investigation of the self-association and DNA binding properties of a series of ternary ruthenium(II) complexes

“…picenMe 2 1,6-di(2 0 -pyridyl)-2,5-dimethyl-2,5-diazahexane picenBz 2 1,6-di(2 0 -pyridyl)-2,5-dibenzyl-2,5-diazahexane bipy 2,2 0 -bipyridine phen 1,10-phenanthroline dpq dipyrido [3,2- …”

“…Such p-p stacking interactions are also important in the packing of aromatic molecules in crystals [2,3] and their aggregation in solution [3][4][5]. Such interactions are involved in the intercalation into DNA of organic [6,7] and inorganic [8][9][10][11][12][13][14] molecules that posses a planar aromatic fragment.…”