Designing neutral coordination networks using inorganic supramolecular synthons: Combination of coordination chemistry and C–H⋯Cl hydrogen bonding

Bis‐μ‐pyrazolate‐Bridged Dinickel(II) and Dicopper(II) Complexes: An Example of Stereoelectronic Preference of Metal Ions and Stabilization of Mixed‐Valence NiIIINiII Species

“…[16,17] The choice of terminal ligands of this work stems from our continued activity in the coordination chemistry of nonplanar pyridyl/ pyrazole ligands toward transition metal ions. [2,4,6,7,18,19] Specifically, in the present work our target has been to synthesize and structurally characterize dimetal(II) complexes, satisfying the following requirements. (i) The metal ions should show stereoelectronic preference in their coordination.…”

Supramolecular architectures with ladder and lamellar topologies using metal-ligand coordination units via C–H···Cl and O–H···Cl hydrogen bonding

“…A general motivating factor of this work is to gain an understanding of the effect of chelate-ring expansion and to study the electrostatic effect due to the presence of counter-anion on the formation of network structures. Considering the former factor, the symmetrical (2-pyridyl)alkylamine ligand L 1 is expected to be more electron donating than the previously used unsymmetrical counterpart L 2 [28,29], based on the presence of two five-membered chelate-ring forming pyridine rings in L 1 compared to one five-and one six-membered chelatering forming pyridine rings in L 2 . From this background we specifically synthesized and structurally characterized three …”

“…It is obvious that the chelating organic ligands of our choice can be employed as part of effective assembly strategies of extended networks containing neutral coordination complexes with chloride-bound metal ions [28,29]. Attention has also been directed to the influence of additional coordinated solvent molecules [29], which can act as hydrogen bond donor/acceptors in the assembly of supramolecular architectures via non-covalent interactions. Herein we develop these ideas further, placing them more confidently in the context of the inorganic supramolecular synthons, based on the positioning and the number of metal-chloride bonds and the effect of coordinated solvent molecule, capable of taking part in non-covalent interactions (hydrogen-bonding).…”

“…The primary concern of our endeavor [28,29] is the demonstration of the generality and versatility of the C-H···Cl (2)(3) M II/III hydrogen-bonding interactions in the formation of supramolecular networks. It is obvious that the chelating organic ligands of our choice can be employed as part of effective assembly strategies of extended networks containing neutral coordination complexes with chloride-bound metal ions [28,29]. Attention has also been directed to the influence of additional coordinated solvent molecules [29], which can act as hydrogen bond donor/acceptors in the assembly of supramolecular architectures via non-covalent interactions.…”

“…In our previous studies [28,29], we made use of non-covalent interactions (primarily C-H···Cl hydrogen bonding [12,18,20,30,31] and π -π stacking [32]) sustained by primarily neutral ligand-bound-M II/III Cl 2/3 (M II = Co, Cu and Zn and M III = Fe) units containing non-planar pyrazolylmethylpyridine and unsymmetrical (2-pyridyl)alkylamine ligands. The primary concern of our endeavor [28,29] is the demonstration of the generality and versatility of the C-H···Cl (2)(3) M II/III hydrogen-bonding interactions in the formation of supramolecular networks. It is obvious that the chelating organic ligands of our choice can be employed as part of effective assembly strategies of extended networks containing neutral coordination complexes with chloride-bound metal ions [28,29].…”