Synthesis, Crystal Structure, and Solution Properties of a Hexacopper(II) Complex with Bridging Hydroxides, Pyrazolates, and Nitrates

Coordination Versatility of Pyrazole‐Based Ligands towards High‐Nuclearity Transition‐Metal and Rare‐Earth Clusters

“…[57] In some of the O(R)-centred copper(II) triangles, small values of magnetic susceptibility (values lower than those expected for a S T = 1/2) at low temperature are found. [29,61,75,76] Pyrazole-based ligands have also been used as additional bridging ligands with mononuclear compounds to form tetranuclear copper(II) compounds [77] or to bridge two trinuclear units, thus forming hexanuclear copper(II) compounds with the formula [PPN][Cu 6 (µ 3 -O) 2 (Rpz) 6 (4-RЈ-3,5-Ph 2 -pz) 3 ] (R-pz -= L1a -, L1c -, L1d -; RЈ = H, Cl). [69] Mononuclear and trinuclear copper(I/II) complexes with pyrazole ligands were used as starting materials to synthesize compounds of higher nuclearity by addition of other bridging ligands (i.e.…”

“…Mononuclear and trinuclear copper(I/II) complexes with pyrazole ligands were used as starting materials to synthesize compounds of higher nuclearity by addition of other bridging ligands (i.e. carboxylate, pyridazine or nitrate ligands) 29,61,75,76. Pyrazole‐based ligands have also been used as additional bridging ligands with mononuclear compounds to form tetranuclear copper(II) compounds77 or to bridge two trinuclear units, thus forming hexanuclear copper(II) compounds with the formula [PPN][Cu 6 (μ 3 ‐O) 2 (R‐pz) 6 (4‐R′‐3,5‐Ph 2 ‐pz) 3 ] (R‐pz – = L1a – , L1c – , L1d – ; R′ = H, Cl) 62.…”

Synthesis, Structure and Spectral, and Electrochemical Properties of New Mononuclear Ruthenium(III) Complexes of Tris[(benzimidazol‐2‐yl)methyl]amine: Role of Steric Hindrance in Tuning the Catalytic Oxidation Activity

“…The bond angles around the Ru center (81.01-99.02; 162.09-179.52°) deviate considerably from the ideal values of 90°and 180°and the N4-Ru-N6 bond angle of 162.1(2)°i ndicates that the primary distortion involves the diagonally opposite bzim nitrogen atoms (N4, N6), which are bent away from an axis normal to the RuN1N2Cl1Cl2 plane ( Figure 2). + [19,20] [20,24,25,26] Further, as the Ru III center is not capable of back-bonding the metal-ligand bond lengths are determined primarily by the σ basicity of the nitrogen atoms. [27] Thus Ru-N bzim bonds in 1 are shorter than the Ru-N py bonds (2.073-2.087 Å) [12,14] in the analogous complex [Ru(tpa)Cl 2 ]ClO 4 (3) and other ruthenium complexes.…”

Bis(μ2-benzoato-κ2 O,O′)bis(benzoato-κO)bis(ethanol-κO)bis(μ3-hydroxido)hexakis(μ-pyrazolato-κ2 N,N′)hexacopper(II) ethanol disolvate

“…2). From the mean plane through Cu1, Cu2 and Cu3, the bridging O7 atom of the central 3 -OH ion is displaced by 0.390 (1) Å slightly out of the plane, a feature commonly found for nanojar compounds (Ferrer et al, 2000(Ferrer et al, , 2002Hulsbergen et al, 1983: Angaroni et al, 1990Sakai et al, 1996;Casarin et al, 2004Casarin et al, ,2005. The bond lengths between the three Cu ions and the 3 -OH ion are very similar; the same applies for the Cu-N distances ( Table 1).…”