On the Nature of Arene η6 Interactions in the Solid State and the Use of Cylindrophanes as Ligands for Sandwich Complexation of Metals with Longer-Range Interactions with the Benzene Ring

Crystal Retro-Engineering: Structural Impact on Silver(I) Complexes with Changing Complexity of Tris(pyrazolyl)methane Ligands

“…The pyrazolyl−silver “sandwich”, made up by cation−π interactions, is clearly shown in the middle of the top picture in Figure . These values are in good agreement with those found for several studies on arene−silver interactions, including statistical analyses based on the existing structures in the Cambridge Structural Database, where distances falling in the range of 2.89−3.37 Å were reported for Ag−arene interactions. Two other L1 ligands, with two pyrazolyl rings κ 2 bonded to the metallic center complete the distorted tetrahedral coordination for the Ag(2) atom.…”

Two new polymorphs oftrans-bis(hinokitiolato)copper(II)

“…The Cu atom is 3.336 (1) A Ê from the centroid de®ned by atoms C1, C4, C5, C6 and C7 in (Ia), and 3.226 (2) A Ê from the centroid of the C4ÐC5 bond in (Ib). These distances are comparable to values (3.25±3.55 A Ê ) observed for longer-range non-covalent Cu II Á Á Áarene contacts (Mascal et al, 2000).…”

Self-Assembly of Discrete Metallocycles versus Coordination Polymers Based on Cu(I) and Ag(I) Ions and Flexible Ligands: Structural Diversification and Luminescent Properties

“…In the two compounds there are also weak Ag···C interactions with Ag⋯C distances in the range from 3.052(3) to 3.107(2) Å that fall in the secondary bonding range (the sum of the van der Waals radii of Ag and C is 3.42 Å) [61]. These type of Ag⋯C interactions, with distances ranging between 2.80–3.34 Å, have also been reported for other polymeric silver (I) compounds [33,59,60,62] and are thought to have a decisive influence for the packing in the solid state for the compounds under study.…”